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Thursday, December 26, 2013

Stamping Versus Machining

This is how we used to mass produce steel parts:

Factory of origin - TMP Voronezh, Russia, 1963 YOM
Table size -                  6.5 x 16.4 feet
Overall dimensions - 25.6 x 31.5 feet
Height above floor -              29.5 feet
Press weight -                    486 tons
This is how we do it now:
ABENE CNC universal milling machine
800 x 500 x 475 mm | VHF-680


Inspired by this comment:
It is curious that a stamped sheet metal design (like German designs and the American M3) was chosen before the CCCP had the production capability, so that early AK47's were machined from billet.
Almost the reverse of SIG going from stamped sheet metal to billet machined weapons now that CNC machining is so much less expensive. - Ed in a comment on one of Tam's posts.
I've read that bit about early AK-47's being machined rather than stamped, and it is pretty weird, but then there was a lot of strangeness going on back then, even in the parts of the world we knew about, and who knows what was going on in Russia.

3 comments:

Ole Phat Stu said...

The tolerances on stamped parts are larger than on milled and so the stamped AK47 less accurate than the milled ones.
Like 6" groups at 100 yards instead of 3"

Stamping is cheaper though for mass production. A stamped AK47 costs just over 100 Euro to make, a milled one thrice that.

Charles Pergiel said...

I kind of doubt the accuracy claims. The barrel and bolt are machined. The only parts that are stamped are the receiver (body) and the cover and all they do is hold the barrel to the stock. There might be minute differences in accuracy due to whether the receiver is milled or stamped, but it is going to be on the order of millimeters, not inches at 100 yards.

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