re: Rem. 40X .244 threads - too nice not to share.

[Packrat1947]

If the barrel was threaded between centers (likely), the thread was nearly complete when the operator screwed up and hit the end of the thread. The dog slipped on the barrel a little and, when he went to make another pass, he split the thread. The tool was dull, the speed was too slow, and cutting oil may not have been used. Not pretty but it probably worked fine for years. WH

This is a factory take off bbl. I'm thinking it was a die on some paper controlled machine. At a mid 1970s community college we had a paper tape drill press. Nice machine that did wonderful work for us students . Just fascinating to us.

 

[PRR1957]

Engaged the half nut on the wrong number.

As I’m a former machinist, you got that right.

 

[Packrat1947]

I can not imagine trying to duplicate these threads. These are pre - '62; I believe.

The second photo is a 1981ish 40X repeater bbl.
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Will, : This is a factory take off bbl. I'm thinking it was a die on some paper controlled machine. At a mid 1970s community college we had a paper tape drill press. Nice machine that did wonderful work for us students . Just fascinating to us.

 

[Will Henry]

I'm pretty sure the 40X barrels were fitted on a fairly conventional lathe set-up in the early days but I could be mistaken. I would go with the wrong number on the half-nut engagement except most small lathes have a 8tpi leadscrew so there is no wrong number on a 16tpi thread. WH