Greetings!What tolerances are acceptable in a wooden gun stock, assuming there will be bedding agent used when assembling the build? I am currently making a custom gunstock for a hunting rifle that i want to optimize. I drew up the measurements from an empty gunstock i have from that specific gun. I built myself a decent workbench to use a handrouter to mill out the pockets. I did some test runs to see if what accuracy i can get. I used slabs of beech wood to emulate the hardness of the final wooden laminate slab.As i am new to working with a router there is a lot of tinkering with different inserts, guiding rails and so on. I am currently on my third attempt on the beech wood pieces and its getting decent.With the drawing and measuring by hand i am able to get to .5 milimeter.As for the milling i am not so sure. In the deep pockets (50mm plus) there surely will be the combined effect of the bending of the longer inserts, play in the bearings and torsion of the plunging mechanics of the hand router itself.(pic stolen from the webs)
>>64326584If you're betting with epoxy you want about a gap about .5mm because there needs to be some room for the epoxy to fit. However, it is very easy to accidently cut oversize with a router, especially with long bits. I would use a drill to remove as much of the wood as possible, especially on the deep cuts.My advice is to use the router to rough out most of the material, but aim to cut it undersize. Then fine-tune your fit the traditional way, by blackening the parts over a sooty flame, bringing them into contact with the wood, and cutting off the high spots where the black transfers to the wood.
>>64327156As for more specific info on the tolerances, it really depends on where the specific location is. You want anything visible once the gun is assembled to be very clean and straight with minimal gaps. Nobody wants to see bedding material instead of wood. You also don't want big gaps anywhere where stresses are high, like where the wood is thin, or in areas around the recoil lug or bolts. On the other hand, if there's a big gap in front of the magazine well that doesn't really matter so much. Concentrate on the important areas.
