wtf happened to this site? no machinist thread???Ask machining questions, post machining failures.CAD CAM talkSpeeds and feeds guessingG-Code, M-Code, Bro-CodeFanuc vs HaasBitch about payIgnore SiegWhine about spline shaftsButton pushers who think they're machinists
some oc
>>2944099I got a question for machinists Why is it that you guys can cut titanium to fractions of a human hair width with crazy amount of repeatability But none of you guys seemed to make a marriage last? How’s it feel knowing that you see a Burned in CRT screen on a machine control that’s going to be in a scrap yard after you die more than you see your children?
>>2944099>Ignore SiegThat's some good advice right there...
Has anybody here tried out a desktop CNC machine like a DMC2 or Carvera? I know they're less than ideal for steel, but the idea of being able to fabricate metal parts in my garage is very appealing.
>>2944128HAHAHA OMG HOLY SHIT WOWTHIS GUY REALLY HAS YOUR NUMBER LMFAOAND THE WAY HE HITS ENTER TWICE AFTER WRITING ONE SENTENCE ON A LINE IS JUST THE ICING ON THE CAKEHAHAHAHA WEW
>>2944326>Has anybody here tried out a desktop CNC machine like a DMC2 or Carvera?Not personally, but i was witness to people attempting to use them.>I know they're less than ideal for steelWon't keep you from buying one and trying it.>but the idea of being able to fabricate metal parts in my garage is very appealing.If you're fine with aluminium and it looking like a rodent chewed it out, sure, you can "fabricate" metal parts with that.Now go buy one and be disappointed. Why did you even ask.
>>2945184because he was hopingyou're right but there's no need to be prissy about itadopting a more positive, less sarcastic outlook will fortify yourself as well
>>2944326Me being me, I'm waiting for those spark generators from rack robotics to get some reviews then I'm building a wire EDM. Safest machine to use as long as you don't touch anything.
>>2944099and the next contestant on How Bad Could It Possibly Be? is the $125 scamazon 10" chuck
>>2945846ranked by order of importance >scroll fit on body hub 9.3/10>lower jaw fit in body grooves 6.6/10>top jaw fit on lowers 4.2/10>scroll and gear finish 6.1/10>component hardness 6.8/10>pinion fit and finish 5.0/10>burrs 4.2/10>grit and dirt 3.8/10>overall finish 5.9/10>hardware 1.6/10total scored 4.9adjusted for chink expectations 6.5-7.0the plastic scroll retainer isnt my favorite thing but really shouldnt see any load by design
>>2945850>plastic scroll retainerlmao
has anyone dared to try this thing
How much does a brand new lathe and mill depreciate in value?
>>2945859Only at least a few tens of thousands of people. There's reams of information on the 7x lathes out there.I used to have one. It was okay. My biggest complaint was that the gib on the...either the cross slide or compound, I forget which, fit terribly in the dovetail. So badly that it allowed the tool to suddenly tip downward by like a full mm in a "heavy" cut. It was usable if you only ever took cuts light enough to avoid that problem, but that made things painfully slow (not to mention surface finish issues). Apparently that's not too uncommon a problem and I planned to fix it, but I scored a great deal on a 2000lb 14" lathe with fixable gearbox problems and sold the mini.Would I buy again? Hate to admit it, but yes. Take that with a grain of salt, though. Now that I have other, much larger equipment, it's far easier for me to fix any problems it has than someone who's stuck with the mini as their only machine tool. Also, I bought my 7x14 when the more "premium" versions were like $800 including accessories. HF is currently selling the smaller 7x12 for that much and I can't even tell if that comes with a drill chuck for the tailstock.
>>2945859My work got this vevor lathe as an impulse buy and even as a cheap stuff enthusiast I think it was a mistake. I picked it up for free from them a bit ago and honestly will probably never use it for anything.
>>2945850burs are easy to fix, dirt can be cleaned, even if they are annoyingi usually consider them unfinished hardware
>>2945912yep sop. took about an hour to clean up. its my 5th chinkchuck so far. the best was a 6" i bought circa 2007. the jaws are glass hard and it clamps within .0015 across the full rangei have to murder another old chuck to cannibalize the d1-6 backplate before i get to assess the true functionality of this one
>>2944326did you order 1 yet?
>>2945184Nah fuck this guy, those cavers airs take some monster cuts… guy I know has a corn cob rougher on his, and a 14” 1” 3 flute finish mill to do tool steels a lot of horsepower and just uses 120v super worth it
>>2945850it only appears to be the 3rd chuck that has lived on this backplate
What's the best free offline CAD software? Have done 2 gymnasium courses with Autodesk inventor and I'm doing one with solidworks right now, but since they're p2w i most likely won't be using them for hobby purposes.
>>2949378freecad 1.0 is kinda good, and 1.1 is about to go out this month probably, and its supposed to get all the good stuff that couldnt make the cut of the 1.0
Taking a community college machining class, made my first chips today. Looking forward to really getting into it next week.
>>2949972I look back with fondness at the time in my life when that was me. Make some friends anon, don't stress too much and enjoy it.
>>2949997Basically what I'm doing, this class is a side dish to a welding associate's so I can actually have fun with it - though honestly I find machining way more interesting and enjoyable than welding, and would probably switch majors to it, but the job prospects are a lot worse afaik. The friends part is kinda iffy, I'm friendly with a few guys in my classes but they're mostly zoomers straight out of high school and I'm old enough that it wouldn't even be that weird for me to be their dad. My teachers are more like people I'd hang with though, and weirdly my welding instructor is a girl a year younger than me and totally my type which is pretty awkward, it's a lot of work holding myself back from hitting on her.
Picked up a sherline 4400 lathe and the matching mill, along with a lot of tooling, for very little. The previous owner used them for rc cars and steam engine models.I don't have a real use for it but the price was too good to pass up and it seemed fun. Other than being tiny they seem very highly regarded. For what I paid they're cool conversation pieces of nothing else.Does anyone have a good idea for some starter projects? I have pretty much all the accessories other than cnc parts, the rotary table, and the threading tool. I will probably buy the threading tool since honestly using a micro lathe as a threader seems pretty useful and setup seems easy.So far the only practical thing I've done is face some rough cut aluminum and brass rounds. I make challenge coins on a fiber laser and its hard to find decent quality brass blanks nowadays that aren't 1.5" or smaller. However this lathe doesn't have the oomph to part something that thick easily so I use a bandsaw.I do have a onefinity I use for aluminum and brass sometimes but no real manual machining experience other than wood.
>>2944099why the fuck is it "machinery's handbook" and not "machinist's handbook" or "machinery handbook."
>>2950549https://www.youtube.com/watch?v=gdaXdSvKHzk
>>2950579that's interesting.
if i bought two alibaba sliding tables and bolted them to an L shaped pipe frame, would that be a viable mill ?
>>2950633You would need something with a good spindle able to take side loading and an acceptable range of spindle speeds...Might make for a fun little surface grinder though... Bolt an angle grinder or regular motor with grinding wheel to it. Throw a cheap may chuck on there and start throwing steel at mach 2.
>>2950633L-shaped wouldn't have the rigidity to mill much, but you might be able to get somewhere if you triangulate out the column kinda like pic related (super rough mockup)
>>2944326>DMC2You can do steel with dmc2, because it's frame is steel. I have a genmitsu 3030 prover max with a 110V 1.5KW ER11 spindle and it can do steel, even with it's anemic stock spindle and aluminum plates. Rigidity is key for steel.
>>2945859>>2945867don't bother with these Chinese toys.get a PW lathe. yes it's expensive. but they are worth it. they are actual lathes not toys for wood/plastic
>>2950817Those are basically the same chinese toys everyone else sells. Ordered to a higher spec and then gone through and the fit and finish is polished up and everything checked over real well.
>>2950817Of course those are the bigger chinese lathes rather than the mini lathe. But Jet, Grizzly, and Enco and a few others are good options for those sizes as well.
>>2944099would this be wacky? getting two cheapo 10lb weight plates, true the edges on both of them on my home lathe and then put a radius on either side of each plates corner so the two plates can come together and form a tube bending die. i probably wont do it
People seem to think it's a small lathe meaning you can make small parts. I often use the biggest lathe at work for the smallest parts because it provides greater rigidity, stability, and control. You get none of that in these small import lathes unless you pay for it. PM seems to be the only real option for import benchtop lathes that I've found. FWIW, if you live in the US just find a south bend 9 in lathe and throw it in the back of a uhual truck, you can find them for the same price as these toy lathes.I guess it ultimately boils down to what you want to do.>Do you want a project lathe to finish, that still might be garbage?OR>Do you want to use a lathe to make parts?>>2950844>They are basically the same>Except they are completely differentwat>>2950846The vevor one, grey m100 is 8.7" x 29.5" for $1500 USD. The orange one isn't even worth mentioning imo.The lowest cost PM is 10"x22" and is similar size to the vevor but significantly different.>But Jet, Grizzly, and Enco and a few others are good options for those sizes as well.A lot of them have the same problems. They still need some work unless you're getting a non-bench lathe. The PM is the only one I've ever seen that just works with promised accuracy out of the box. I've went down this route 4 times with bench lathes for work, a cheap Chinese lathe, a cheap Taiwan lathe, a Grizzly, and a Sherline. I spent more money on each lathe than the cost of a fully kitted PM 10"x22" + tooling to have comparable machines. Yes I was able to sell the "upgraded" machines and get most of the shops money back but trust me buying the PM 10"x22" was worth every penny. If I could go back I'd have bought the PM and never messed with the others. If you could get the same dimensional accuracy as the PM with medium or minimal effort, I would argue to get the cheap options every time. It's just not worth it for how much work is required.
so I already have some plates. I got my idea cause I used a plate to make a bending die for square tube. for a round die I think im gonna use 5lb plates because they are only 7.25" diameter and thats a good radius for the round tubes I want. I think i will make a mandrel these will fit on and then turn them both at the same time. I would like for one edge be 1/2 for 1" tube and it would be nice for the other side to work with 7/8. Im trying to think how i will make the bending side, maybe get another larger piece of tube with a thick wall that 1" tube will fit into and then cut it in half.
>>2950814>only $2500convince me not to run a DMC2 mini in an apartment.if I get some sound proofing foam the noise shouldn't be too bad
>>2950971>convince me not to run a DMC2 mini in an apartment.No. DMC2 is legit a good machine. Fuck your neighbors. You can probably get away with using it there.>if I get some sound proofing foam the noise shouldn't be too badTake the box it comes in, picrel, and add foam.see https://www.youtube.com/watch?v=Yxa8HH3t_Ds
>295096nein>295097won>295100toogo shill your trash toy elsewhere
someone's cranky
im going to use a 2" pipe nipple for the mandrel probably a cap too for the center to get on. Ill open these center holes to 2.25 and then turn the pipe down to fit. im trying to keep this low cost and im trying to think of something menards would sell thats big enough i can use as a bushing. maybe bearings from amazon.
>>2951058for the clamp die I have some 2" wide 3/16 lengths and I will stack a bunch together, weld the sides and cut the middle out with whatever size hole saw and then cut that in half. for the wiper I might do the same
>>2950846Man, I can't speak for the others, but IDK about Jet. My school has four brand new ones, my class is the first to ever use them. (Along with one other period of the same class.) One of those four machines is already broken down with some kind of electrical problem. "My" machine has more backlash than you'd hope for in a brand new machine despite all the controls being a little stiff, and seems less rigid than it ought to be, plus the fancy-looking DRO isn't that reliable either. It's not just me saying that either, the instructors seem pretty underwhelmed too. They're an improvement over the completely clapped out WW2-era machines they replaced but pretty shit for a machine you or I would pay almost 20k for.
to make the bushing I will modify two caps, turning them down and center drilling them. since they have such a big OD I decided to not bother turning the pipes diameter, only to just get it straight. I haven't cut a radius on a lathe and im wondering how I should cut a hhs bit. I only have 3/8 hhs so I was thinking about making a left right and middle profile or welding like 3 togther. im not sure.
like this was an idea where I would take 3 hhs blanks (I have a lot), tig them together, and then trace and cut out my radius and then trim down to the holder, my 3/8th lantern style holder
Im gonna give this a go. why not
>>2951242>form tool over 1" wide>with a reduced shank>on a lantern toolpost>on a lathe that smallMy lathe is significantly bigger and it still wouldn't much like to be putting that thing into anything harder than plastic.
>>2951215>>2951242>>2951247Yeah that's gonna chatter like a motherfawker... At least use it as a guide to cut out the majority of it with a cut-off tool or other standard lathe bit before even trying to plunge that in there. >>2951077>almost 20kLol. Yeah they overpaid for that shit. Grizzly is 8600 for the same basic thing. Precision Matthews is 10k. Probably some "college education government discount" bullshit where they jack the price up 2x so someone's cousin can pocket some money.
>>2951250The school paid less (about 16k with DRO and a service contract - apparently a pretty shit one since they still haven't come and fixed it 3 weeks later - etc.). $20k is about what the same lathe lists for with similar options for a normal buyer. On that note, there's also some fucked runout in the chucks, but idk if that's down to the school's install or the lathe itself. One of the other students was having some kind of issue so they got out an indicator and there was a couple of thou in the chuck that was turning into like 5 thou at the end of the workpiece. Not sure the numbers on mine but I'm getting a weird taper and broke two center drills (which probably fucked my part, but I can remake that fast if they'll let me send it with the cut depth), and watching them it sure as hell looked like it wasn't lining up concentric like it should have been.
>>2951247Yeah i cant cut it. The lathe is too small, the cutter is too big, the hardness got runied, and the carriage runs into the plate. Sometime I will get an amazon carbide assortment and retry it
i enrolled in college for a 2 yr machining program and got accepted into a tool and die RAP. we're building an injection mold die and testing it out in class. really satisfies my 'tism
>>2952483Machining isn’t difficult it’s meant to literally children to manufacture products in a overhead belt driven machine factory with wood floors and no fire escapes Go to school for something cooler like nursing or electrical engineering >>2951247Have yountried giving it blue chew? Heard that makes it more ridgid
>>2944099Why do machinists brag about being able to program or know cad? Are there really that many button pushers in this industry to where that’s all that is needed to be impressive?
Does anyone have experience with watchmakers lathes? My main interest is making small models and projects. tiny engine, pens, watch/clockwork, jewellery, ect. All the videos i see make them look incredibly satisfying to work with. Im just not sure if this is a bad way to get my foot in the door with machining.
>>2953502I have one that I got on a pallet of junk at an auction. It's in a trailer with some other stuff I'm probably going to sell, but your post gave me an idea that I could probably adapt a drill chuck to it, and use a die grinder or rotary shaft grinder on the toolpost and make a pin/punch grinder out of it...
>>2951256Seems to me the student's didn't clean the spindle nose/chuck mount when changing chuck's.What kind of mounting system is on there?
Currently working on some bushes made from this stuff, some kind of composite material about which i couln't find much information. It's called tribo top
just got a job at an auto machine shopnow make the same amount i made at the grocery store lol
I would like to recreate Cristofle cutlery for my wife. Unfortunately they only come in silver coated, so even if i had too much money, they're unusable for me.So my idea was to diy. 3d print a hull that keeps blank stainless cutlery in place, engrave and repeat.My makerspace has proudly acquired a makera, would that be powerful enough for this kind of engraving work? I've read quite a few negative experiences regarding round shapes and keeping the spindle on track without breaking end mills in the process.If that all works, do i need to add renew finishes or is stainless steel cutlery really "just" stainless steel? If it isn't the later, can one even do the necessary processes at home?Last but not least, am i completely off and should look into laser engravers?My experience with metal so far is basically just ordering sheet metal, so please bear with me.
>>2953551I think it's a camlock. As far as I know no student has ever changed the chuck, these have only been in use by students for a few weeks and our class has never fucked with them but I don't know what the other one is up to, they've been way harder on the machines than us in general and there are some suspicious scratches that appeared on one of the ways under the chuck between times I used the machine so who knows. They're also unpronounceable Chinese mystery meat chucks though so they might just be shit.
>>2953612You probably know more about random useless bullshit now too Which letters of tungsten carbide inserts does a 987654321 kennametal boring bar take and got hrc 42069 hardened tool steel feeds and speeds Highest stress fucking job for minimum fucking wage
>>2953773nah i havent touched any machines yet im just knocking out freeze plugs. throwing shit in the parts washer, and dollying engine blocks around the whole building because the lift cargo lift is broken
Machining class anon hereI have a really hard time not saying "Sneed" whenever we talk about feeds & speeds or chucks.
Are the YAMAWA taps on aliexpress legit?They've got great photos showing the boxes with correct model numbers and the prices don't appear to be *too cheap* to scream a scam.Are they just copies?https://www.aliexpress.com/item/1005009594713520.htmlI've managed to find some pretty decent taps on aliexpress so far but it does seem like a bit of a hit and miss.
>machining diploma>3 years experience >head programmer>supervisor >5 machinists under me>$29/hr Should I be happy
>>2954556i bought a bunch of the uncoated sprial point. theyre fakes. the package is just slightly off like most of the good counterfeit shit. they werent that cheap. like $6-8ea for under 6mmthe only failure ive had was one single m3. it cut about 8 turns down into an an aluminum part on its very 1st hole them sheared off perfectly square. luckily i was watching and instantly got the spindle stopped. best i can tell it was a heat treat crack at the thread root. now im gun shy and waiting for another to do it and assfuck me
>>2954622>the package is just slightly off like most of the good counterfeit shitI see. Now that you mention it I don't think I can quite match all the model numbers to the ones on Yamawa website, the numbers look similar but don't quite match.I guess it would be better to try and find a good quality Chinese brand for a better value for money option? It's a shame, I know that <$5 high quality taps exist out there but I just have to find them.
>>2954781Victor machinery has always been good for taps and drill bits for me. Or you can always score deals on e-bay, but you might have to piecemeal them together from different sellers.
>>2954619No kys rite now
sunday night steady rest shenanigans in 4140htused the bitchcrane because ima bitch and wont hold 53lbs of 3" roundbar out in front of me like i used to stupidly do
absolute retard beginner here, how the fuck do I get the mill bit out of the collet holder ?I have loosen it, but at a certain point the black ring don't want to turn further, it seems collet and milling bit should be loose by that point but everything is frozen solid.
>>2955018Based. I picked up some of those Simplicity cabinets from an auction a while back. Don't use Harbor Freight degreaser on them to clean them up unless you want to turn the paint to soup... Dunno what kind of paint is on them, maybe an acrylic of some kind?
>>2955097Is it an ER collet? You notice how there's an eccentric ring that you have to snap the collet into within the retention nut? That's there to pull the collet out. The first crack when you try to loosen the the nut is the nut itself loosening, it will turn maybe 1/2 turn or so then bind again. That's it starting to pull on the nut. Just use the wrench on it and it should come out pretty easily.The taper angle on ER collets is just about self-locking. It's normal for them to bind loosely when tightened.
>>2955110>That's it starting to pull on the nut.*pull on the collet
>>2955110So the inner black circle should separate from the outer retention nut ?Sorry anon I am ery dumb, what do I have to do with the wrench ?
>>2955110>>2955114Ok I got it out, I checked with a bore scope that the threaded hole in the CM3 was not blind and I hammered the bit with a rod. The bit was hot from the friction, strange.I think my mistake is to not have removed the chink cosmoline from the collet, I'll put all of them in a good ultrasonic bath of WD-40
>>2955114Just keep trying to unscrew the nut (put it in the machine if you don't have a good way to grab the toolholder) and it should come loose pretty easily. If it doesn't, something's wrong. Leftover rust preventative might make it a little stickier, but you shouldn't have to put much force on the wrench at all.
>>2955097She the black ring stops turning, smack the wrench with the palm of your hand and it will yank it out of the taper , then put the nut flat on the table and use your thumbs to push on the collet and it’ll pop out of the collet nut I trained about 30 teenagers on these things
>>2955149>put it in the machine to hold it Good way to fuck up your spindle
>>2955187If you have to crank on a fucking ER collet holder hard enough that you're worried about your spindle, you're either doing something horribly wrong or there's something horribly wrong with your holder.
I'm making a table for my desktop CNC mill, I've used 3/4" MDF for the table surface and plan to put an thin MDF backboard. What should I cover the surface with for protection from chips and oil? Vinyl sheeting?I'd use acrylic or lexan sheets if it wasn't stupid fucking expensive at home depot.
>>2955204>I'd use acrylic or lexan sheets if it wasn't stupid fucking expensive at home depot.Do not buy any material that isn't wood from a big box store. The markup is unreal, like 6x or more what a "real" supplier would charge.Anyway, a sheet of steel or aluminum would be best. Anything else won't really hold up that well, long-term. Of course, if you're only using it as a hobbyist, it's not really going to matter what you use. When I had a mini lathe, it was just sitting on an unfinished plywood bench. Used it infrequently for a few years, worst that happened is the bench picking up a few stains.
>go set that by the green machine, anon>wh->sorry, gotta go byeThis motherfuker is trolling me, every fucking machine here is green
>>2955199Non-machinist material handlers leave racks of cat40/bt40/cat50/bt50/bt30/hsk63a whatever tooling outside Office staff had renishaw omp 40-2 and 60 probes in card board boxes tossed loose together 10k+ of them So yeah if you work in a machine shop with nobody but engineers and machinists it’s clean and everything is done right The second you hire a fuck tard who doesn’t see the difference in the different “drill bits” and sticks them all in a cardboard box and sets it outside Everything goes to shit
>you see that blinking light>the machine needs blinker fluid Gotten
>>2955480They know that’s a lie What I like to do is give a guy a piece of HSS and have him look around the shop for low speed steel
>>2955204Put rubber matt or that washing machine matt under your machine.
Why do we need a Japanese word for having a suggestion box and reviewing production processes?
>>2955788Also, I think it's just so management can move machines around so it looks like they're doing something.
>>2955788Kaizen/5S is actually a really good fucking process It’s just that the Mexicans can’t really interpret Japanese intellect properly and the Americans boiled it down to bejng lazy When Toyota does it it’s superior, clean workshop, spotless floors, shared parts amongst production lines and less injuries In America trash everywhere , day laborers doing the shit and ineffectual management largely due to the Hispanic population and the American wokeism that leans toward hiring women In Japan it’s still very racist and strict
I've got a mulcher which the main axle keeps taking hits and blowing out the keyway and mashing the belt wheel. Now the fit looks like a whores asshole and I'm risking a critical failure operating it. The axle and main rotor are a single part so that keyway just keeps taking massive impacts and i don't know what to do about that. Stop throwing huge shit into a tiny mulcher, yea. But it's a very powerful 4 stroke so dollar on cent I'm still going to run it like that even at the cost of the axle because it would be 8k to get a larger model. Somehow I need to reinforce that axle/ belt wheel interface so it can stand up to the impact even if I've got to weld the whole thing into a brick. Any guidance?
>>2956301>I've got a mulcher which the main axle keeps taking hits and blowing out the keyway and mashing the belt wheel.Take pics of what you are talking about... Are you talking about a wood chipper/shredder? When I hear someone say "mulcher" I think of a culti-packer, which makes zero sense in regards to how you are explaining it.
>>2956303Yea it's a chipper shredder. The shredder assembly is all one piece and had a rectangular keyway for a bit of bar stock that functions as the key. Problem is that the engine is too powerful for the unit and the rotor really isn't heavy enough for a chipper, that's the trade off of having a shredder and a chipper as a single machine. So when you chip things the axle takes too much impact, which blows out the keyway especially if the fit between the keyway, key and wheel isn't good.I can weld up the keyway and get a new key but it'll just keep happening unless I can get a good fit or reinforce it somehow
>>2956307do you have a lathe? building up a shaft and cutting it back is mediocre because the weld is soft plus you usually end up with a stress riser where the weld startsa new 1045 shaft or even better made from 4140ht tgp will exceed whatever butteralloy the mfg used. then upgrade to a new taper lock hub sheave and seat it with green loctite on the shaft interface
>>2956309>building up a shaft and cutting it back is mediocre because the weld is soft plus you usually end up with a stress riser where the weld startsThat was my concern, going down that route. Milling out the belt wheel and putting pic relate in the belt wheel would get a much better fit, but getting a better alloy axle is our because the original one is welded solid to the whole rotor assembly and at that point I'd be building a whole rotor assembly from scratch and I'm worried it wouldn't balance.
>>2956312>pic404you need a better sheave that grips the shaft better. qd hubs with a flange is excellent. taperlok with no flange is good too. the shaft needs to be within .001" of nominal hub diameter and clean no oil at all. loctite like i said above is even better yet. that will hold on a rebuilt welded up shaft if lathe turnedstick welding it and using an angle grinder will not get it round enough for a taper seat hub to grip
>>2954619Compare to me. Truck driver 6 months ago, hired as a machine operator. Zero experience in the field. Making $32 an hour.
Anyone have any experience with this style of inside mic? I pretty regularly have to machine slot features to tolerances that I don't trust calipers for, but don't necessarily warrant the precision and time consumption of gauge blocks. The other option I'm considering is a set of adjustable parallels, but I figure the cost of a set from a reputable maker would cost nearly as much as the micrometer anyway. >>2954121My supervisor for a few years was a man named Sneed. The first few weeks were agonizing, but I managed to acclimate over time. >>2950549I just call it a da bibble.
>>2956477Fuck, you should've made him a sign that said "Sneed's Feeds and Speeds""Formerly 3-Jaw Chuck's"
>>2956307How often do you need to take it apart? Just to service the bearings? I'm saying this, because sometimes the farmer fix of welding the fucking thing solid is about as good as it gets. Rebuild the shaft, put a new keyway in and get the fit as good as you can, then put a nice weld around the entire pulley right to the shaft. If it needs serviced in the future you just gotta grind that weld off and it's free to come apart. Taper lock pulley like other anon mentioned would also be much less likely to slip and bung up the keyway than a normal pulley with set screws.
I bought my first lathe. It came with a bunch of attachments and a tool chest full of different cutters and grinders and collets ect. Im going to clean it up some before i move it out to the shop.
>>2956495NoiceKekd
>>2956618Is there some mechanism for carriage feed that isn't visible, or is it just crossfeed and compound?
milling machine retard >>2955114 here, first thing I've done and it came out nicely, make the inside of that telescope ring circular and of the diameter of my tube.Runout under 1/10 mm, way enough. I am happy that telescope ring is sooo squishy but if I don't tension the chuck enough the ring will slip. And you cant put a thing that has features at each 90° inside a 3 jaws chuck...
>>2956742fug
Nice fit, I machined it with 3 washers between the two halves where it closes at 148mm for a diameter of 147mm for the telescope
>>2956742>>2956745ditch the chuck and clamp it down on the faceplate of the rotab with toe clampsyou can screw down a piece of plywood under it and cut a boss on it to just fit the id so its trapped centered
>>2956748>ditch the chuck and clamp it down on the faceplate of the rotab with toe clampsthat was the first plan, but that means I have to center it so I preferred to use the afternoon to clean the rotary table, the chuck, put it all together, bolt it, than spending 20min to center it kek.>you can screw down a piece of plywood under it and cut a boss on it to just fit the id so its trapped centeredOh I see, I can get a rough but good enough centering with that, it's aluminium casting anyway and the original ring is very oval, almost a centimeter on the 140mm it is supposed to be.
>>2956750the trick to centering everything is an indicator held in the spindledial in on the od of the rotab faceplate by turning the indicator around the edge. lock the table since i ass u me theres no dronow you can lightly clamp your part down nd bump it in as you indicate it while turning the spindlethis all should go quicker than youd think
>>2956751Thanks for the tip anon, i'll try that for other, smaller parts, the ring is almost the size of my turn table that dodgy as fuck and i'll smash into the clamps with the tool holder, that being before the part smashes into my teeth.
>>2956709Its just the crossfeed and compound. Its a watchmakers lathe. Im pretty limited on space and i liked the way this one looks. Just gonna have to work on small projects for now but at least im getting started with something.
>>2956841looks really cool, nglhow are you going to powert it?
>>2956618Shaublin are very high quality, well done.
>>2956868>>2956876Thanks, its Ive got a small 3 phase motor with a vfd and a counter shaft to run all the cool accessories from. Everything is belt driven which is pretty neat. Its got a grinding and milling attachment for the cross slide Id like to build a box or something for the vfd. It works but i would like it to be a bit nicer.
>>2956751Hurr durrr okay whatever you coin clipping mother fucker
Update on rotorTold to fuck off my 4 different shops>we don't repair write off equipment>out of warranty, buy a new one>we don't do shitty farm mig repairs here>no we won't mill the wheel back to metric, your lack of lathe isn't my problem>no we won't mig up the keyway, your lack of mig isn't our problemGenuinely didn't expect this, I just went in to ask them if they'd weld up a bit of metal. Had cash. Wasn't rude. What tradesman faux pas did I commit?>>2956313This was by far the best solution, and i put that to one of them when they said they couldn't just weld the keyway, and he knew what i meant but just didn't like that idea at all. So I'm going to weld the bar stock into the keyway myself, lock tight one of those inserts you pictured into it, i can tap the threads into the wheel myself. How to bore the belt wheel metric without any proper tools? Hand fit, careful measurements, a file, marker dye, more cold weld compound. That part is at least anchored./emt/ chads > assholes at local shops
>>2957284>2957284 #youre going to have to find a small time independent guy that works alone out of a his garage or such. only because its kinda an assache job with a high failure probability compared to standard commercial work. ask at the local independent auto parts (ie not autozone) if theres a local repairman that does heavy equipment. those guys dilligaf as long as you have cash. id do it if youre in the 123w45n gegraphic regionas far as the taperlok flange you need a matching sheave because it works like a collet to grip the shaft. the sheave has a tapered bore that compresses the hub. the qd style use a set screw but that isnt much better than what you have with the og pulleyyou really need to find somebody with a welder or get a cheapie and do it yourself because cold weld epoxy is a joke for something like this unless you use $2000 devcon and even then its iffy
>>2957284I think they probably told you to join the far queue because welding up or messing with keyways in any way shape or form is generally taboo. I mean, keyways as badly damaged as yours. As for making it stronger, having 2 keyways on the same shaft diametrically opposed is a thing.
>>2957284Take it to a farm repair shop. That's where the real magic happens.
>>2950817Holy shit, the 12x28 is $5500? I remember buying a grizzly g0824 14x40 for around $6k back in 2018. Time flies.
I run a CNC machine that is really easy and only make 18.50 sigh
>>2951077Oh yeah, update on this. Tech finally came out and fixed that machine a couple of weeks ago. Some kinda bad contactor or relay or something. The next day one of the other new Jets broke down though, and is still broken last I saw it. Staff are very unhappy with Jet.
>>2954619See if you can get hired up in Prudhoe. They do have machine shops up there, it's 2 weeks on 2 weeks off, and they'll pay for your flights there and back for each 2 week stint. Not a good long term job, but good for nesting. 6 figures.
>>2957679Yeah and that's with a 2axis DROInsane
>>2956892Got around to rewiring the motor. Its not very pretty but it works. Eventually il build a nicer set up but for now im still trying to get everything in good enough shape to start machining things. I never realized how hard it is to find a place that sells stuff for machining. I couldnt even find a micrometer in person.
>>2957714And a further update. All four machines have had various issues now. Instructor is irate. Says he's going to try and return them and get South Bends instead.
>>2948411Yeah, they just came back in stock. Waiting on shipping now.
Very small and easy thing But I am a beginner it's the first thing I am doing on the milling machine. Chewing gum aluminium from the yuropoor equivalent of home depot. They sell 12mm diameter bar that is 11.5mm because nobody cares.Drilled 2 of them through, the 3rd has a 4.5mm hole on one end and 6mm on the other end. You'll understand. I really enjoyed making it
Drilled 2mm hole, the rolled pin is 2.2mmFits nicely without too much banging
>>2960923The cable is crimped with a BIG rg58 coaxial cable crimp i am also a ham retard. I put some heat shrink tubing on it for the look after
Job done. The white knob for the focus of the telescope is from drawer furniture. I trimmed the protruding 3mm screws after
Guys I got a new job and have to learn Heidenhain controls how fucked am I
>>2960954meh, they are not that difficult, but its been 10 years since i used them
>>2960954Those are nice controls, simulation built right into the software If you told me you got a job running fanuc 0i or yasnac I’d say you were properly fucked
If i wanted to clone an out of copyright product and send it to a machinist would it be something they could do? I am thinking of a weck razor specifically. OR will i have to draw up the schematics?Weck Surgical PrepPic related.
>>2961851Some shops will do it, but blueprint or not, you're going to be paying well into the 4 figures.
>>2961855Not surprised milled products are expensive. I doubt they would do serial run production discounts right?
>>2961856The main issue is that thing isn't machined, it was stamped/forged. It's going to be a nightmare if you want it exactly identical. Making more than 1 piece is pretty much always going to bring the price (per part) down but you're still talking about $2000 for 1 or $4000 for 10 kind of thing. Why do you even want to do this?
>>2961859Well if it's not identical that's fine. I know from material differences even for the same product it ends up as a variance even with the same model. 1 Reason is for personal usage. 2nd reason is i can see selling 100 or even 1000. Sitting on the product to sell aint that big of a deal depending upon the profit that can be made. I am spit balling but the niche community of people that enjoy razors is just large enough to sell 100 pieces of something that is not being made anymore.
>>2961860Those people aren't going to buy some random repro for the amount of money you'd have to charge for them. I'm not joking that it would be $2000 for a single one of these and that's assuming you find a shop that's even willing to do it. I'm guessing you don't have one to begin with that could even be used for reverse engineering?
>>2961863Yeah i am boned, if i had the product on hand(extremely hard to find even with ebay). These private companies are selling 316L stainless steel razors for 250+ a pop. They only do this since they own and maintain the machine. Thanks for the insights it gives me a fresh perspective.
>>2961851These are usually made out of cast zamak just buy one make a mold then Old out of zinc alloy
roller bearings on a brass sleeveopinions on longevity
>>2962977>roller bearings on a brass sleeve>opinions on longevityHow fast is it spinning, what kind of load is on it?, how large of diameter is the brass sleeve/shafting? Are the roller elements running directly on the brass? All of those are factors that will effect it.
>>2962981>how fastit's a steering column>diameter1" id 1-1/4 od" >running directly on the brassyes that's why im wondering if I should get a steel one instead
>>2962981would stainless steel be better?
>>2962983>>2962995For that kind of low speed and low load application brass would probably last forever. How much of a pain would it be to replace the brass sleeve if it does wear? Normal steels would work fine as well, and be a hell of a lot easier to work with than stainless.
>>2963010>How much of a pain would it be to replace the brass sleeve if it does wear?pulling the column out of the car
I just read an MLP fanfic that claims that the introduction of CNC resulted in "total economic annihilation" for manual machinists:>Alexei eyed Celestia slyly. "I bet you're really glad I nationalized the company now, aren't you?">Celestia rolled her eyes. "If I'd known you were about to seize control of the entire manufacturing industry with your CNC machines, I'd probably have insisted on it!">"Hey, now, I didn't seize control," Alexei said smugly. "I just essentially threatened them with total economic annihilation if they didn't sign on to the Ethical Business Alliance."(My read of this is: Alexei invented CNC machines and then sold them only to companies that joined the EBA. So manufacturing companies could either join the EBA and buy the machines, or refuse to join and get run out of business because their competitors all had CNC machines and they didn't.)Is this at all realistic? My impression was that manual machining is still pretty viable as a career and a business, even though CNC machines have been around for 70+ years IRL
None of this shit appeals to me at all I like animals, nature, lifting, I like cars, I like IT, software, video games, fat women, (haven't ever had a skinny woman so idk yet), I like piping layouts like sprinklers that was fun, architecture type stuff is cool but I don't have the fancy shoes, I like sports but I would rather do individual sports though I'm good at basketball, I like hiking so I don't know. I can't get into CNC and metal. I'm sorry bros
>>2963189I like motorcycles, photography, reading (the new version of reading although I was a voracious reader before the rapture), I like thinking I don't like CNC because, like soldering components, it feels gookish almost. Uncouth I like 3d modeling I can spin an apple in my head, so to speak.I'm not terrible with my hands, I'm actually quite good. I just haven't done that stuff a lot and frankly don't want to. I think for me I like vision and ideas more than handy work. I like creating. I love writing and posting.
>>2963190I tried oragami once that was chillLove weed, but haven't had any in a long time I don't drink, I'm voluntarily chaste, I don't spill my seed unless I'm reproducing. Zero alcohol. I drink a gallon of coffee a day literally
>>2963192Big time health guy, love health. Haven't had anything except actual real food since 2017. Love, love all kinds of drugs. Love drugs. Not to abuse them, but I love all kinds of drugs they all have their purpose and application. Very much a psychonaut
I'm only in this thread because I went through a CNC course in Bosnia because I wanted to make bank in Germany. But I realized that was a terrible idea. I forced myself through it. I can't do that shit for a living. It makes my stomach upset I have a physical reaction in my gut. Sorry bros Have a mechanical engineering degree though
>>2963194We did what are they called ... We used fucking.. fuck, they were American machines. Really modern and cool. Give me some names and I'll tell you. I think the logo was red and it had a German sounding name
>>2963195Haus? Zhnauzer? HaasIt was fucjen HAAS bros U guys do those? Haas machines?
my olny experience with bosnis is an old coworker of mine went there (twice actually) circa 2017 to get a mail order bride because he was a 36 yo fat manlet with a drinking problem and low self esteem. i saw pics of the skankoid. she was a babe and lived in a shack with 3 generations. but she was looneyer than theses schizopoasts. so he ended up just getting bilked for $15k and was still lonelyluckily when he was 37 some 34 yo roastoid latched onto him because she needed to speedrun an attempt at a normal existence before her dad expired from cancer. so he got gf->wife->kid in under 18 mos
can someone help this newbieI am trying to create a pad out of this but keep getting "wire is not closed"It is two circles and two lines tangent to those circles. Everything is constrainedIs the problem that I was supposed to make a one continuous line? so don't use circles but use arcs instead?
>>2964384I updated my sketch to be a continuous line made of arcs and lines and it worked. I guess that is what I need to do for creating 3d shapes?
>>2964387>>2964384yay, it works kinda. I was trying to simulate movement of a flipper arm for a solenoid that will pull a hinge
just got promoted to toolmaker at my job
>>2944099>fanuc vs hassthe true answer is mazak
>>2964387Quite often in CAD a 2d profile needs to form a closed "chain" or "loop" that defines the shape you want. If you do 2 circles with lines like this, you should be able to use the "trim" or "snip" tool, click on the part of the circle that is inside the shape. The tool will remove the un-used part of the circle and join it to your straight line where they meet. One done on both circles you have a continuous chain of lines that defines the part shape.
>>2964509That is not the lowest level? What comes before that, the chips blower?
i've got a small online shop and i'm wanting to get into machining mostly for prototyping and small level productionmost of what i do is designing and selling small gun parts and i thought i would be fine just ordering one offs from chinese machining companies, which kind of works but last time i ordered from one it wound up taking 2 months before i could get it, and now as a result i'm very closely falling behind a competitor with the same idea who has their own manufacturing capabilitiesmy workshop is just a small shed but i have room for something as large as a bridgeport mill, however all i have currently is a 220v outleti was thinking a bridgeport would be the best option since its powerful, sturdy, and as cheap as the other options i was looking at, but i would have to rent the equipment to move it (small trailer with a ramp, pallet mover, maybe a large engine hoist)or i could get pic rel which is only 530 pounds and probably less capable, but it'll ship to my door and work on my 220v outlet, aswell as take up way less spacethe parts i'm making are also pretty small compared to the sorts of things i see being made on the bigger millsand for what its worth i also intend to convert whatever i get to cnc down the line>just get a haas or some other enclosed cnc millquite literally dont have the space
>>2964727if you get a mill like that, or anyone has one see this video on how to gain some extra height https://youtu.be/9WmxGqWomdkits not working height, but you can use that extra height to change tools allowing you to use bigger tooling in general
>get NIMS Certs a year a go>apply for jobs>get interviews>get rejection emails>all of the jobs around here are either half and hour's drive away (I don't have a car), expect me to work 12 hour shifts for the same wage as a walmart worker ($15), or both>the ones that are within a bus ride's distance still don't want to even call me despite me applying their multiple times>I even joined a local temp agency for work in my field but even they can't find me workworst part about this is I know the job market is just as bad if not worse within a 300 mile radius of my rust belt town.
>>2964727What about something like a Tormach 440? They're not crazy expensive and take up about the same amount of space as a Bridgeport.
>>2964632its a tool making position instead of production
>>2964788>get NIMS Certs a year a goi got like 5 of these in trade school and i was never asked nor required to show them
i want to make a benchtop injection molder
>>2965039>i want to make a benchtop injection molderso get fuckin makin
>>2964978to be honest it just kind of looks like an even worse mini mill than the pm-30 i was looking at getting, i could easily make something pretty similar with it by building an enclosure and hooking up motors to the axesalso i've realized there is something i want to machine later down the line that would require the full capabilities of a bridgeport for, its not related to my business, but the cost of paying someone to do it for me could end up being a few thousand dollars due to its size
how many of you are STEM (engineering especially) fags and how many of you are actual machinistsim an ME student myself
>>2965133i am a eng that did manufacturing research on a mill, trying new tools and shitnow i am waiting to have my house remodeled so i can have a workshop, with a lathe and a mill
This monster just turned up at an action house in my area. If anyone lives in Northern California and has a fucking Komatsu 980 to haul it home with it currently has a bid price of $10. Restoring it would be a chore but you'd never need to buy another.
>>2965220
>>2965222
>>2965223
>>2965220fuck that thing is ugly. looks like something the soviets wouldve built the quill seems undersized tooa cleerman or bickford is a nicer machine
>>2965225If you have one for sale in Northern California for $10, sign me up!
>>2965220it looks fucking cool, but i am in the wrong continent
>>2965227just gotta watchpicel wasnt in great shape but usable $1k is top dollar. i paid $500 for mine being dragged on the trailer
>>2965233The reason I posted it is because I don't need it. I've got an old Rockwell (originally a Walker-Turner) 70-400 20" drill press with Power Feed. It is lighter duty than the Swift-Ohio and *way* more than I need. If I intended to buy it you wouldn't be hearing about it.
>>2965234
>>2965235Oh I will.
can someone help me with a project?I need to make threads in a model I made but I have no idea what the specifications are for the screws I've got and I don't trust my ability to measure something so small with calipers. I'm a stupid female in over my head.
>>2965335post pics of the screws?
>>2965220>>2965222>>2965223>>2965224Man that thing is fuckin stout... Too far away for me. Already have a pretty honky tonkin radial arm drill press too that I need to fix up someday.
>>2965335there are no wamen on le internet, tits or gtfo (dont actually its a blueboard)
>>2965386>>2965235>>2965233>>2965228>>2965220It sold for the princely sum of $50
>>2950817I have the 1130it kind of sucksnever buy variable speedthey are completely gutless unless you are winding it up to max RPMand the times you run slow speed is when you need the most torque its ass backwards
>>2965734also I made the mistake of buying the stand from them for it and it is absolute dogshitthe entire lathe shakes around making the added rigidity over the smaller 10-28 I had non-existent i've not gotten around to fabbing a steel tube stand, the price would've been cheaper to just buy the steel tubing than the dogshit flimsy stand
>>2965335>help >woman
New machinist buying a used machine, anyone know what parts exactly I should be looking to replace here, the description is sort of vague and I dont know where to lookThe mill is a 9x42" Acramill (bridgeport clone) and its being offered to me for 2300Should I just pass it up and find one without any missing parts?
>>2965760
>>2965760r u buying it to fuck around with at home or for work? if work find a better one preferably an actual branded bridgeport. make sure it has a working oiler before buying because otherwise itll be guaranteed worn the fuck outthe problem with the asian clones is they did a lot of fuckery with close equivalent sizing. especially 5/8" (.625") vs 16mm (.630") and using goofy old british threads on the table locks and shit. plis they never fitted the slideways worth a shityou can get every part from various places. chinkexpress scamazon egay all have shiploads of metric parts for cheap but you have to verify each piece individually h&w machine has genuine bp parts and good service and even a few yootoob vids on servicingt. has a gaggle of em
>>2965335measure the hole count the threads
>>2965133EE Associates. Too poor right now to get Bachelors and can't find job with associates yet, so I'm in an ME(Manufacturing Engineering) Associates program now. It's a mix of electrical-mechanical, industrial maintenance, PLCs, and machining.I've always wanted to get into machining to make paintball stuff. But now I also want to make other cool shit that I give as gifts. The school has a separate manufacturing lab(cnc mill, cnc router, laser engraver, 3D printers etc) that's semi-open to the public, that let's them make one off prototypes.I'm hoping they'll let me run the mills by myself. If not I'm gonna keep researching to see which cnc mill I should get. Right now I'm looking at the Tormach PCNC 440.
>>2965133I have an associates in mechanical engineering technology. I run a small machining department that has 2 shifts, 4 mill machines, and 6 machinists. I used to do swiss machining but that shop went to shit
>>2965769Work mainly, but not a lot of it, just testing designs before sending the files off to a separate manufacturerWill also be doing some personal projects on itAnd correct me if I'm wrong, but isn't Acramill one of the more reputable companies?
>>2965799>one of the more reputable companieslollmfao even thats like asking if kroger frozen peas are better than safeway select
>>2965804Sorry I dont know much on the topicI figured I might just be able to machine upgrades for it, I don't know if thats unrealistic or not but i can definitely design the parts
>>2965809its not so much upgrades as the issue is the fit/finish of the moving parts often sucks on the chicom knockoffsbut even a knockoff bp is better than a drill press. so slap a $200 chinkshit dro on it and buy a real kurt vise and start making chips
I want to have two pieces of 3d plastic secured together via rod and rod will go through a ball bearing. The piece will be small, the rod will be something like 2-3mmI have some aluminum rods but it doesn't look like it will wor. It doesn't grab PLA as tight as I wish. It either doesn't go in at all or friction is not enough to prevent PLA from slipping the rod. Maybe super glue would help I also want to be able to remove or adjust parts if neededI am now thinking pic related, elastic spring dowels but I imagine a 3mm dowel would destroy a ball bearing with inner diameter of 3mm.But maybe it would work if I use a larger diameter ball bearing? I can wrap a (teflon?) tape around part of the rod that will go into bearing and make it just tight enough. Or could be a 3d printed sleeve
>>2965958>3d plastic3d printed plastic. also ball bearing will be in the middle in case that matters
how do i solidcam?is that where you click on the surface of the 3d model and it makes the program for you?
>>2965958how does it go into athe ball bearing?can you draw it on paint so i can get a better picture in my mind?
>>2966196Gray line is aluminum rod. Red parts are 3d printed plastic that should be firmly secured into rod and blue circle is the bearing.The entire part will rotate but I want red plastic parts to have a secure grip so they don't slip off and change their relative angles. I ordered some elastic spring dowels and will give those a try. It should grip plastic hard enough. I will use a larger diameter bearing so it is not a tight fit there (use shims if needed) so the bearing doesn't explode from stress
are there lathe inserts with an inward curve shape? It seems like all the inserts are circles or rounded corners but I want something that can round a corner. It would save me time from grinding a piece of HSS manually
>>2966290ive only ever had them in brazed carbide. theyre not cheap and basically junk as soon as you chip the edgehttps://presearch.com/search?q=brazed%20carbide%20radius%20form%20tool%20lathe%20bit&page=1if you dont want to hand grind you can use a radius form milling cutter with one edge acting like a regular lathe tool. hold it in a collet or tool block with the edge on center
>>2966290brazed type
>>2966290also if youre truly deranged you can figure out the math and step cut the form interpolated. picel is done in .020 on the diameter cuts to prefigured z depths. only takes a couple minutes to cut then blen with a round file
>>2966290of course there are, not that commonrandom example https://www.cutwel.co.uk/lathe-tools/sagd-convex-radius-turning-system/sagd-inserts/r4-5-admt-radius-inserts-for-sagd-turning-system-canela-admt1503r4-5tin25
>>2966290>inwardstop being racist...
>>2945859I had one for a couple of years. Made some tiny shit but was effectively useless for non hobby applications
How do you mark and drill holes accurately? No matter what I do my holes are always off where I want them. Either my mark is off center because I'm looking down at an angle when I mark or my drill ends up walking off center. Pic related is a T nut I made yesterday by marking with a punch and then spotting with a 1/16" bit on a press, the idea is the tiny bit should pull the part into center before it it cuts but this ended up being the most off center hole I ever drilled.It's impossible to find information like this on the net now, back in the day there would be entire blogs dedicated to autistic topics like this and now all I get in search results are stores trying to sell junk.
What can I make that people will buy? Literally willing to make a $1 profit on my minimill CNC as long as it’s something I made instead of money through a job. Do you think someone would buy a custom engraved brass belt buckle?
>>2966711Dildos.Dildos and some weeb figurines.
>>2966687Drilling holes on the mark with a center punch alone, trusting that the hole will "align itself" will never be that good. I went down that rabbit hole a number of years back. Even back then (when as you say, the net was better), the people who supposedly showed you how to scribe, punch, and drill accurately would showcase their holes clearly out of center with the scribe lines. Bottom line is that the punch mark is there to prevent your drill from wandering, not to bring the hole into alignment. If you're truly a turbo-autist insistent on drilling holes to .001 position tolerance on manual tools, look up "Precision Hole Location for Interchangability in Toolmaking and Production" by Moore. It's basically a long ad for a jig borer, but it shows you the ridiculous lengths that people would go to in the manual days to get really good location tolerances. They would wind up drilling the same hole like five times with five different tools. For your situation, I'd say get an x/y table and a center finder or something pointy that you know runs true, then get a magnifying glass and align it as close as possible in x and y with scribe lines. You'll get something like +/- .005 easy as long as your scribe lines are good. >>2966204Print a hub with a hole for a set screw and grind a flat on your shaft.
>>2966687I would always make sure I had a sharp scriber and sharp center punch/spotting punch. Slide the center punches point along one of the scribe lines, at the intersection of the two lines it will "click" into the center point. A light tap first, then check if the little prick is actually on center. Then a heavier tap to make a good guide for the drill bit. If the first light tap is not right you can adjust the position slightly with further light taps, but only once or twice. Pilot drill then should be thin enough to flex itself into the center point, take a light peck and visually check its position. Very light pressure at the start, sharp drill bit with the correct tip angles will help it to not wander.
Machining student here. I'm required to buy a 4 piece combination square set for my next class. The school recommends a $150 Elite Precision model but I intend to do this professionally and I'm not against spending more to get a real quality piece. Starrett has a set that should be around $280 with my student discount and I really like the idea of getting something nice from them before private equity completely ruins the company. There's also a TESA B&S option in the same price range. Any advice?
How the fuck do I make this go in straight? It keeps grabbing at an angle, I counter drilled the bad threads to full size to act as a guide but there's too much slop and it still grabs at an angle. Everything is bent, I think the tap is bent, the tap handles are bent, my drills are bent, no wonder my holes keep coming out off center. How the fuck does anyone in china manufacture anything if this is the quality of tools they have?
>>2967080i feel like you should use a drill press as a guide or something, or maybe create some kind of jig to hold it straight
>>2967080y u no put tap in tailstock chuck?
>>2967083Because it still goes in bent, my tail stock is not adjustable and has some alignment issues. But I think the tap itself is engaging on one flute first which is causing it to go in at an angle.
>>2967089I got it, had to break out the two handed tap wrench and get over my fear of breaking the tap. Yeah it goes in at an angle and wobbles around, but somehow still manages to cut the thread.I don't know how people tap on a lathe, the part keeps slipping, the tap keeps slipping. I used some cylindrical soft jaws made out of wood to grab the entire length of the part and even then it would still slip if I tried to cut more than one thread without backing out.
>>2967107step 1 is get good taps. spiral point gun taps are the best. they push the chips forward as they cut and are the strongest cutting tapsspiral flute are a fucking meme. theyre weak as fuck from the flutes and if you cut in more than a diameter they ball the chips in the flutes like a shitty hand tap. and they need to be spun fast as hell to get the chips started
>>2967107Under say 12mm or 1/2" I put in the tailstock drill chuck. Sure it might slip but it works long enough to get it started straight. Then put a regular tap handle on it to finish. Any larger than 12mm then I put a dead center in the tail stock which goes into the center hole in the tap. Then an adjustable wrench resting on the tool slide, turn the lathe chuck by hand in neutral.
>>2967116>Then put a regular tap handle on it to finishwhy? there is zero reason to take a tap thats held in perfect axial alignment and put a fucking wobbly tap wrench on it
>>2967089anon fix your tailstock...
>>2967119Because keyless drill chucks don't have enough grip to drive a 1/2" tap to full depth in stainless steel. You only need to guide it straight at the start, once it is a couple turns into the job then the axial alignment looks after itself.
Crooked turning continued.How do I get a good surface finish? High speed? Shaft is going to go into an endmill holder and needs to spin straight.
>>2967281Forgot pic.
>>2967281Grind a Shear cutting tool, make and use a roller burnisher, get/make a tool post grinder for optimum surface finish with your bench top lathe
>>2967281garden variety mild steel is the bane of the machinist. shit sucks to get a good finish onrunning at wrap9 with carbide works 7/10 times but that aint happening on a sherlinemake it out of 12l14 or 1144 if you need finish or twirl it against the scotchbrite wheel
>>2965761Aren't these are better than Bridgeports?Tom Lipton uses one
>>2967089lol
how do i not shit brix when parting?all of my parting tools are fucking gay and i always have trouble with parting i have steel and carbide insert parting toolsa lot of times the tool will not cut into the stock and just rub until i really crank on the handle sometimes it will jam and trip the clutch in the spindle i've fucked around with where the tool sits nothing seems to help...seem to have best luck with it sitting a tiny bit below center
>>2967353I've heard Sharpe milling machines are premium. I have a Tree milling machine that has heavier box ways than a bridgeport or bridgeport clone. Of course there are always Milwaukee or Kerney and Trecker (Probably fucked up the spelling of that) Big ass heavy milling machines that are way better for hogging material.
>>2967371Make sure it's sharp and rigid, run at slower rpms and flood it with high sulfur cutting oil while feeding it steadily. Should make chips come off with a sizzling noise kinda like frying bacon.
me and my partner are getting a vertical cnc for machining things for our business, both of us are pretty new at it and we're getting the machine mainly for prototyping and small amounts of work, but he said it might be a good idea to put out some signs on the side of roads advertising a custom parts service to make some side cash for the businessis this a bad idea? we dont have the same capabilities as a full scale shop and other than the cnc machine all we'll have are basic fabrication tools (angle grinders, welder, hand files, belt grinder, a shop press at some point)my partner used to be a mechanic so maybe we could get decent business from boomers looking to get cheap replacement parts for their ancient muscle cars
>>2967371Learn to grind cutting edges, I'm a noob but I spent a good few hours fucking up parting until I played around with the tool profile and saw what a difference it makes. The right profile starts peeling away the metal the moment it touches even on my tiny lathe. And yeah it needs to be below center, otherwise the cutting edge of the tool will not touch the part until you push hard enough to deform the metal.. at which point it will suddenly grab and break something. Also if it's too far below center then the part can 'climb' on top of the tool as you get close to parting it off and break something.
>>2967408how the fuck do you have the money to buy CNC mills and not have this figured out much less know how to use them?
>>2967439i know how to use it, and theres a definite but specific need for it (a need that outsourcing can't fulfill), but its a startup company and business is gonna be slow in the beginningalso i said cnc but its really just a converted bridgeport
>>2967444why the fuck would you buy a CNCed bridgeportcan you even automate Z axis on those?every one I've fucked around with used DOS and had to do Z position manually most retarded shit ever
Well it's done, took me almost a week to make a part worth $15 and the runout is nearly as bad as if a drunk chinaman had made it.
>>2967478>v2xt has entered the chat
>>2967478because it was cheap, probably gonna replace the controller and make it work with a modern laptopalso you can automate the quill z movement, the knee movement is way harder to do if thats what you were thinking of
>>2967479But now you can say you made your own slitting saw arbor! Good job anon!
>>2967519Thanks for the (you), I did successfully manage to cut some mild steel with it just now and it's working better than I thought it would. Now it's just a question of how long these blades last and how to re-sharpen them.
what would be the best way to cut the groove pictured in the square here? assuming the large round part on the bottom is clamped down on a rotary tableI can either position it vertically or horizontally, i'm wondering if i should use an end mill while its in the horizontal position, or if i should use a t slot mill while its vertical
>>2967634you can use cheapo ones from the hardware storehttps://youtu.be/5LqNaTyzU0k
>>2967651endmill with it horizontal will have a much lower cutting force so less likely to deflect and chatter. itll also be easier to control the dimensions but this is totally a lathe job
>>2967676i know, but i have much less use for a lathe in for what i do so its more convenient to just use my mill as one
ok which one of you niggers is posting on the boomerforumz?
>>2968100this a boomerfourm now
ordering this for the brideport
score
>>2968122>22 weeks agohe probably recycled them already
>>2968123messaged her 3000 left
>>2968126jesus
>>2968120Uh that looks a bit large... I have a ridiculously large rotary table I got for next to nothing. Like 18" diameter or something stupid like that... I have it soaked in wd-40, bagged up in a black trash bag and stuck in a wooden crate...
>>2967283>turning between centersholy shit anon i love you
>>2967281emery paper is fine for most jobs
>>2965691crazy its scrap price is probs more than that
>>2968159i know its big but i got it for the same price as people selling other tables and this one has cross slide on it too
>>2968315Heavy hard to move shit is the bane of meth head scrappers.
damn I didn't know this thread was here ive had the button masher thread open for months
>>2968437All machinists are machine operators, but not all machine operators are machinists.
>>2944099weird ass question: what were people using on windows 98 to write gcode? was it still all by hand then, or was there CAM software? i'm on a bit of an old software kick right now, and i think it would be cool to take a look at how people used to write programs. nowadays we have shit like mastercam/surfcam, but i still have to write by hand for the lathes. i guess it hasn't changed all that much.
>>2967283>between centersough. not fun. it's a thing, i just associate centers with grinding. has its uses but kinda gross ngl
>>2968571my guess is they ran it on dos
>>2968581right, but what software/utility was used to write the gcode in the first place? i get DNC is a thing and pretty much always has been over RS232, but the code still had to get written. i'm asking what software people used for CAM/gcode writing back then
>>2968610my friend bought a bridgeport cnc brand new in in 1995. his kid was a early computer megasperg and immediately started fucking with it to install a keyboard and bring the win95 desktop up. i think he programmed in bobcam via a spoofed dongle. this was pre torrent shit all loaded by boxes and boxes of floppiesit was almost all 2.5d cam. 3d was parametric programs ans equation subroutines because of file size.plus hed do a lot of cheating like hand coding a profile outline to cut with a 1/4" endmill then run it first with a 6mm endmill to leave a finish pass without any extras programming or fucking with cutter comp
How do you check absolute perpendicularity? Like if you want to check the XY table on your mill. And you don't want to do it by clamping a square to the table and running a test indicator along the square since that would rely on the accuracy of the square.
>>2953502No but I’m going to buy one that’s just 100€ on local fb marketplace. It’s something I’d like to get into eventually, and it’s really the only kind of machining you can reasonably do at home without having a giant garage you’re not using
>>2968908Shit I was too slow, been vacationing away from home for two weeks and it already sold.
>>2968614We had parts at work that were supposed to be 1/4" and they came as 6mm. Coworkers brains were hurting when I explained to them 1/4" is 6.35mm (not a machinist btw)>but anon there's no such thing as a 6.35mm socket what are you talking about
>>2968774You put a test indicator in the quill and spin it around on the table by hand in neutral. If the reading is different side to side then the spindle is not square to the table. Same thing front to back but in a different axis.
>>2968927I mean check the perpendicularity of the x axis vs the y axis, not the spindle. IE check that the table itself was made square.
>>2968909i mean for that price is what i would expect, to dissapear fast. those are not cheap in spain>>2968938do the same moving the table, just compare different positions
>>2968944You're not getting me, I mean test that the x axis is horizontally at a right angle to the Y axis. Like if you stuck a block down onto the table and milled an outside corner on it, you could be reasonably sure it wouldn turn out square.
>>2968962yeah i still dont see why you think it wont workthis is what i am talking about, i guess the original anon said this toohttps://youtu.be/Sz_AqnrhJb4
>>2968962There's not much point checking the X / Y axis alignment because within the operators power there is no adjustment possible to correct it, other than pulling the machine completely to pieces to re-grind the ways. You have to trust the manufacturer got it right (on a new-ish machine) or that the ways aren't worn to shit on an old machine. If you get caught taking time to check this alignment on the job then you could expect your supervisor to shout at you for time wasting.
>>2968963I'm not talking about tramming. I'm saying if you just went out and bought and XY table and wanted to test if the axis were truly at a right angle to each other from the top view.
>>2968965So the root of my question is if I bought linear guides and ballscrews to make my own machine/ table, how would I make sure I installed them at a right angle. There must be some method that doesn't rely on using a reference square.
>>2968968you mill a square block and measure itcheck this TOT video https://youtu.be/tW8HNAlUXxUrelevant info starts on 15:40 , but who doesnt watch his entire video at least once
>>2968968Some basic ethos of machine building is that you are imposing the accuracy of one machine onto the machine that is being constructed. A practical example; you would use an accurate milling machine to drill the mounting holes for your linear guides. It's hard to obtain the accuracy that you speak of from a starting point of zero. In that case a master surface/square might be made by hand scraping.
>>2968973>Some basic ethos of machine building is that you are imposing the accuracy of one machine onto the machine that is being constructed.If this were true then we would suffer from precision degradation every time we built a new machine that built another machine and so on, sort of like making a photocopy of a photocopy. This is obviously backwards to how our technology evolved from rubbing sticks together to modern technology that gives us precision on the order of atoms. If we can 'hand scrape' something to be square then there must be a way of measuring it that doesn't depend on a reference square.
>>2968976gravity makes a plumb bob a vertical reference and a bubble level you also get horizontal level, so you get a square reference. using it directly is not as easy, but you can scrap something to that levellike why the hell are you so against a squareness reference, that is what is used on a workshop. like a square machinist bubble level.you only need to do it properly in a lab for the reference and calibrate a grinder or whatever machine you want to make the new references
>>2968969So he's still using a reference square to check squareness and that limits him to the accuracy of his tools.To expand on why I'm asking such a weird question, like most hobbyists I don't have a ton of money to spend on this hobby which limits me to buying imported tools from china, russia, india etc. and who knows how 'square' their squares are. Therefore before venturing into trying to make my own milling table to increase the capability of my table top mill, I need to know methods of measuring absolute squareness, parallelism etc. without relying on a known good reference.
>>2968978anon, what you actually want is an independent lab measurement on your cheap square. or compare against something that is used professionallyor use the basic gravity methods that i show here >>2968977 but how much accuracy you will be able to get is difficult to sayin metrology, out of the main labs its all references
>>2968982No, I think I got it. If you can square up a spindle with the xy plane by tramming, then you can mount a spindle onto the x or Y axis and square it relative to the opposite axis with the same method. Provided you are able to mount it perfectly parallel to said axis.. which is probably pretty hard to do given there isn't much of a length on a spindle you can measure.
I know it's still a reference square, but 2-4-6 blocks are cheap and solid and not as prone to knocking out of square as say a machinists square would be. You could check them on a surface plate with a surface gauge and indicator and then put them on the table and tram in your block with your one table travel direction and then check that against your other table travel direction. Should give you a pretty accurate idea of how perpendicular your ways are to each other. Or you could just fuggin run it and assume it's square, because in reality most of this shit doesn't really matter unless you're making some super high precision stuff for NASA or the like.
>>2968986yean and depending on the temps it may get out of aligment just bc of the temp change, there is a million factors if you go paranoidanon you have trust issues, you need to trust your instruments if you want to go somewhere in a reasonable timethis anons idea is also good >>2968991or do you know of any hobbyist, or machinist group near? talk with them they may allow you to compare a square with them or even help you. or a trade school, a university or whatever, people are more helpful that you think
>>2967114I found that gun taps break while using it by hand u less you do like a 60-70% thread engagement machinist handbookI like good hand taps 4 flutes bottoming point,
>>2968996Like the other anon I've had excellent luck with spiral point gun taps. Even running them with an impact.
>>2968986Different anon here. I think you got the right idea. The way I've seen it done is first you check parallelism on a block or cheap square with a mic, then you put the square/block on a surface plate, indicate one side against a stop, then indicate the other side against the same stop. Your indicator difference is the out-of-squareness of the square (times 2). >>2968996>>2967114>>2969000Just broke a helicoil/sti tap on some 304. Had a brain fart and drilled with the next smaller size drill bit. I heard small endmills work to remove them. Has anyone here had any luck? Ordered an OSG spiral point tap, we'll see how it works.
>>2968986both the replies are taking about spindle tram to table which is not x y perpendicular reference the only way to check what you want without a true square is to mill 2 right angle faces without moving the part of two pieces. then flip and put the two together on a true flat surface and check the gap with a feeler gauge. wood butchers do this to check blade tilt on the table sawtrue squares can be generated by scraping by the method of 3 against each other on a surface plate or just buy a decent cert machinist square for $100connelly describes the checks you want starting book pg 328https://djvu.online/file/y45c8HIPIWqtg#
>>2969137>the only way to check what you want without a true square is to mill 2 right angle faces without moving the part of two pieces. then flip and put the two together on a true flat surface and check the gap with a feeler gauge.Fuck.. yeah that makes sense, and sounds tedious as hell, thanks anon.Watching this guy on youtube make his own CNC mill and then he squares the table using the same shitty 'groz' square I got on sale as a set of 4 for $30.
>>2968976>If this were true then we would suffer from precision degradation every time we built a new machine that built another machine and so on, sort of like making a photocopy of a photocopyI like the YT channel Clickspring, he goes into some topics of very early machine building. He used a phrase something like "accuracy can be an iterative process" as in getting better each time. He used roughly hand-made parts to fasion a very ruidmentary lathe powered by a bow and leather cord. Used that to turn a piece of brass to a high accuracy. Other pieces could be made this way to build a more accurate lathe etc.
I used my little chinese boring bar the other day it worked pretty good it was only in brass thoughIm looking at getting some other small indexable boring bars that uses a CCMT06 insert my other boring bars are too big other than that solid carbide one the only other one I have uses a CNMG12 insertIs there a better insert for boring bars?
>>2969294ive been pretty impressed with all the chinkshit bars. the brown coated ones for a few bucks more than plain black oxide have been goodpicel is a little 04 series 6mm carbide shank bar that was under $50 for the bar and a pack of inserts. bored 50 of those grade 8 hard washers out on a single corner and it wasnt trashed
>>2969308Old south bend lathe?
>>2969309correct as usual king friday
>>2969316That top view down looks an awful lot.like my 16" southbend. Got any more pics? Old lathe pics are always sexy.
>>2969308What brand bar and insert is that?
>>2969317its a pretty worn out 1964 4 1/2'. it was my 3rd lathe ever and the 1st that actually was completely functional so im a little sentimental i have a nearly unused 1948 4 1/2' model a in storage to replace it when i decides to decommission it
>>2969347standard ali close your eyes and whudda ya cee
>>2944099> get into 3D printing > get a job at a machine shop so I can learn CAD/CAM and learn machining principles so I can make my own products better > 6 years late know an absurd amount about cnc machines, can identify a Haas hybrid turret from across a shop, can tell you which VDI size you need or if your lathe is a BMT type or not. Met a ton of people in the industry, know the cam and cad programs I set out to learn >can tell you which generation okuma osp control you’re using, if you’re using haas coldfire 1 , 2 or NGC. Can tell you what generation of fanuc control you’re using off a drive part number alone, can get you any option card for the Fadal you need, can get your obsolete yasnac control Mori up and running > fucking hate making anything and hate every second of it > fucking hate the coworkers who were where I was at 6-7 years ago before this journey > hate being responsible for people who know nothing > don’t even turn on my lathe at home anymore > barely even 3D print anymore > family has to fucking begggg me to design something simple for them in fusion because I’d rather just play Xbox > i should have never learned anything about cnc machines or production I should have stayed in that office job where I got paid to do nothing at a law firm , I had a corner office, typed bullshit all day about people fighting over papercrete work over money and land I would have been a less miserable person How do I fix this?
>>2969453>LF6018Deskar says this is for stainless I assume these work well on regular steel?
what do
>>2969480the eye bolt at the top isnt a lift point for the whole machine
>>2969491>the eye bolt at the top isnt a lift point for the whole machinechallenge accepted
>>2969495I saw what you did
>>2969499yah i admit my great shame based hecking gookmoot for randomly tweaking the sourcecode to humiliate fonefags with sideways pictures
>>2969501rotation was stored in exif 4chan has been stripping exif data for probably over a decade so you can blame regular moot for this
>>2969491i know, i was trying to lift with the eyebolt, under the ram, and under the knee so it'd be distrivuted between all of those pointsdidnt work out quite like i thought it would but i think i managed to straighten it out and get it back level on the ground and figured out a way to lift it up without it falling forward again
Machining student anon here again. I need mics, and a local shop has this vintage NSK set for $118 and the guy seems likely to take a lower cash offer. They seem to be in pretty good shape, the 3" and 4" along with the standards have clearly never even been used. Should I?
>>2969674theyd be fine. theyre not top shelf but not total trash chinkshit. my under/over would be $75 for that set but thats probably still in a $1 mcchicken mindset so adjust for monetary weakness accordingly
>>2969674I think its worth it I doubt you could get a chinkshit set for that price and it looks like the two largest ones haven't even been used they look like they still have cosmoline on them
>>2969682>>2969674I didn't even read your full post just the first sentence
>>2969676>>2969682Yeah, if nothing else I figure they have to be better than chinkshit. Hell, if one of them is fucked I can probably get this AND a Mitutoyo replacement for it for what I'd pay for a budget chink set. Probably gonna grab them tomorrow.
>>2969674Nah, I bought mine from the matco truck for $35 because it had tenths graduations and the harbor freight ones issued by work didn’t You probably don’t even need mics for school or even your first job…my apprenticeship ended with that 1-2-3 block project they have you do I just used my mitutoyo calipers for that Mics only come in handy for hard to reach places or like a lathe where you can’t just read the face
>>2969711No machinist will ever admit this, but 99% of the time I don’t even reach for my mics I have to find them, open the case, unscrew them, locate feature, screw them, ratchet thimble, awkwardly read it In these last 5+ years of using calipers 100+ times a day everyday… I got pretty damn good with them. Within one or two thou… which is pretty of run way for a standard part +/-0.005 especially if it’s a one or two of and you don’t really care that much about getting it nominal for no reason
I'm sick of programming websites, I want to produce something more real. Do CNC programmers make good money? It seems like CNC programming would be more specialized than websites because few people have access to a CNC machine that they can practice on.
Ended up getting them for 100. They seem pretty good, got them zeroed to the standards. Could definitely use new oil and there's light oxidation on some of the anvils but I think they'll clean up well enough, and they're at least as accurate as my Mitutoyo digital calipers. I'll have to wait until next week when I'm back at school for a real verdict though. Also, we're specifically expected to use mics for this class, and will be held to .001 standards on some features. The school does have loaner mics most students will be using but my instructor made it pretty clear that they're in bad shape after years of being used by retards.
>>2969453Is the boring bar fully carbide or is it just the shank and the head is brazed on?
>>2969473>LF6018yah they do fine on steel. picel is induction hardened chrome cylinder rod>>2969940>head is brazed onyes. idk if the head is high speed steel or not but ill probably crash it and snap it off before the pocket wears out
>>2969986>yes. idk if the head is high speed steel or not but ill probably crash it and snap it off before the pocket wears outI had read they were brazed on in one of the buyer reviews I wonder if I should bother with the C or H bars and just get a cheap S solid steel bar
I just want a toy lathe to play around with on my desk so I can forget for a few minutes that I live in a tiny apartment and will never be a machinist. Which of these is likely to make more toothpicks for me before breaking down?
>>2970020carbide bars are an order of magnitude stiffer than steel. its not about the durability of the pocket
>>2970031Im not worried about the pocket
>>2970033musta almost been brazing changs weekly smoke breakwhat was the feed/doc?
>>2970034idk its from the review and what prompted me to ask about if yours was brazed or notIts a DEMK brand or at least thats whats on the picture in the description
>>2970035thats just playing the china lottery. no way would i stick unproven chinkshit tooling in an aggressive cnc program and smack the green button and walk awaythe only true solid carbide bars ive seen are everede and they use proprietary inserts. they have a good lock on the small boring market the sandvik and kenna are brazed head
