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09-19-2013, 01:04 PM
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thread pitch question
What is the thread pitch between the extractor rod and extractor ratchet shaft? When I measure, I get #10 with 64 tpi . . . left hand! Not exactly a pitch included in your average starter tap & die set!
If it makes a difference, I'm working on a 5-screw improved I-frame Terrier s/n 71720 from circa June-1953.
Whatever size it is, where can I get both a tap and die?
Russ
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09-19-2013, 01:48 PM
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In the Neal / Jinks book is a reference to that pitch being changed to 7 x 47. I think that it may be a typo, but I pretty much quit looking for the proper tap when I read that! I would love to have a tap & die to tidy up the threads on an extractor rod.
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09-19-2013, 03:26 PM
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I just found this old thread that kinda-sorta clarifies things.
10-46 thread
I'm satisfied we're dealing with a #10 (.183"-.186" diameter) but I'm a long way from getting 46, 47 or 48 tpi. Will try to find a left-hand 10-48 tap & die . . . wish me luck.
Russ
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10-26-2017, 03:44 PM
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Quote:
Originally Posted by linde
I just found this old thread that kinda-sorta clarifies things.
10-46 thread
I'm satisfied we're dealing with a #10 (.183"-.186" diameter) but I'm a long way from getting 46, 47 or 48 tpi. Will try to find a left-hand 10-48 tap & die . . . wish me luck.
Russ
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linde,
I know this is old thread but I am facing same problem now wanting to clean up threads on extractor rod on an old model 36. Were you able to find a 10-48 die that would allow you to chase the threads?
Was 48 Correct TPI?
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10-26-2017, 09:13 PM
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Brownells has some Swiss files that are extremely good. Get a triangular file and VERY carefully chase the male threads.
When you get into the special fine threads, the dies & taps can cost as much or more than replacement parts.
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10-28-2017, 04:42 PM
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Those are "fast twist' threads. Only cut with a screw machine. Don't make taps and dies for those to my knowledge.
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Jim
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