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ACME thread identification question.

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S.D.L.14/09/2019 22:38:25
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Posted by Michael Gilligan on 14/09/2019 22:29:53:
Posted by S.D.L. on 14/09/2019 22:09:11:

A lot of leadscrews are cut by thread wirling, The most accurate are ground.

.

Yes, Steve : But the Boxford drawing that Pete posted explicitly states 'Plunge Roll'

MichaelG.

Yes but that’s for imperial ACME, they may have done the metric by another method?

Steve

Michael Gilligan14/09/2019 22:46:08
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Indeed, Steve yes

That's why I've been banging-on about wanting to know how it was made.

It's of no relevance to me personally ... just an interesting puzzle.

MichaelG.

Pete Rimmer14/09/2019 23:05:57
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Posted by S.D.L. on 14/09/2019 22:04:13:
Posted by Pete Rimmer on 14/09/2019 21:44:44:

I guess you'd need to find an ex-employee from the factory for that, or a drawing.

BTW I had an Denford TDS1 and the cross slide thread on that was clearly cut (or at least finished) with a die. The marks where the die stopped were plain to see.

How are you sure it was a die? Threads cut with an Anjest attachment have a run out like a die as do modern CNC threads no need for an undercut with either.

Steve

I'm not sure, just how it appeared to me. I figured if it was done with an auto knock-off device then the marks would be right at the end of the thread. This appeared to be cut further along then finished slightly short of the end. I only mention it as a matter of interest really.

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