Re: Internal Threading - Compound Setup
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A full profile insert makes the entire thread, flank, root and crest.? Because the root and crest width varies by pitch, they are only good for a limited number of threads.? A partial profile essentially only cuts the flank and root, but you have to finish the crest.? A pass with a file will do it generally, depending on how picky the thread is.? A tool with an 8-48 tpi range is not going to have the proper root width across that whole range, it is only going to be right for the top end of that range (48).? ?From watching youtube, only a limited number of the "machinists"? there bother with root or crest shape, using a sharp v tool for everything.? Whitworth and some other threads have a radius at root and crest.??
Charles
On Thursday, January 10, 2019, 12:14:54 PM CST, Jody <jp4lsu@...> wrote:
In looking for an internal threading boring bar I came across this set on Shars. It's a UN Internal Threading set.
- 7 Full profile TIN coated insert Grade P25C coated with 3/8 IC: 1 each of 8, 12, 14, 16, 18, 20, 24 TPI range
- 3 Partial profile TIN coated insert Grade P25C coated with 3/8 IC: 1 each of A60 (16-48 TPI Range), AG60 (8-48 TPI Range), G60 (8-14 TPI Range)
Is the reason for having the full profile inserts to make the job faster for the lower TPI ranges? Or because the partial profiles can't make the lower TPI threads deep enough? Thanks -Jody
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