What do you guys think about this thing? Think that it could easily be redesigned to use a bolt with a hole drilled in it secured with nuts and washers instead of the >$100 barrel? Is it really as good as it seems? https://github.com/maduce/fosscad-rep

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Strelok 12/30/17 (Sat) 21:39:58 83c285 No.539378

What do you guys think about this thing? Think that it could easily be redesigned to use a bolt with a hole drilled in it secured with nuts and washers instead of the >$100 barrel? Is it really as good as it seems?

https://github.com/maduce/fosscad-repo/tree/master/Pistols/9mm_Shuty_AR-15_Pistol_v4.0_MP-1-unnamed/STL

Strelok 12/31/17 (Sun) 05:33:32 e5e9ad No.539520

I think that the barrel heating problem could be partially mitigated by designing a trunnion that can be annealed (PLA can be annealed by dipping it for a period of time into boiling water. Annealing will make the material stronger and more heat resistant at the cost of warping).

One of the other guys who is into this stuff (Jeffrod) came up with a method to cut rifling through ECM (electro-chemical machining). I proposed the idea to make barrels with this method, and have a machine idea set up, but just haven't had the time to put it into practice. A bolt may possibly be a problem depending on the heat treatment and steel quality. Barrels are normally made with very strong 4140/4150 heat treated alloy steel.

Strelok 12/31/17 (Sun) 06:11:54 66ac0f No.539523

a tube smg is is easier to deal with than 3d printing, and better in the end

Strelok 12/31/17 (Sun) 06:24:20 66ac0f No.539526

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>>539520

4150 can be found in automotive salvage. ensuring the heat treat after would be the tougher part, but if this is limited to pistol calibers it's already pretty good.

Strelok 12/31/17 (Sun) 07:29:52 e5e9ad No.539531

>>539526

finding the appropriate steel isn't that difficult. McMaster Carr has pre-heat treated 4140.

Strelok 12/31/17 (Sun) 07:38:51 1a80df No.539532

>>539526

Pretty sure that car axles are about what you want. Just anneal em first.

Strelok 12/31/17 (Sun) 12:22:57 ea3dd9 No.539553

File: 453a6cea8c6d471⋯.png (37.63 KB, 640x640, 1:1, placeholder.png)

Just like, build stenclone.

>>539523

This.

Strelok 01/04/18 (Thu) 06:29:39 2f8e25 No.540365

>>539520

Annealing the material doesn't make it harder. It's softens it for working with it. Heat treating and quenching it makes it harder then you temper it to the desired hardness

~citation~

I'm a machinist.