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Re: trapdoor breech threads
Posted by Dick Hosmer on Friday, 11 April 2014, at 2:08 a.m., in response to trapdoor breech threads, posted by Paul Dillon on Friday, 11 April 2014, at 12:21 a.m.
They were threaded in a lathe - I'm not sure how else it could have been done and still maintain the degree of interchangeability that they achieved.
Of course, square threads DO require very precise tool grinding, and a careful eye, as there is little/no margin for error(s) in cutting angle, feed, etc.
Making the matching internal cut on the receiver was even more challenging, but they did it.
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