Does anyone have experience with thread "timing?"
Does anyone have experience with thread "timing?"
(OP)
...also known as thread "clocking?" It is a gauge point on the thread surface lying on a plane coincident to the thread axis. It is dimensioned off of the thread axis by means of a basic dimension. It is also dimensioned (and toleranced) off the the perpedicular surface that the threaded hole is drilled in. The purpose of the gauge point is to ensure that the mating component stops at a fairly precise angular orientation when screwed in all the way.
I'm trying to find a way to measure this. The thread is an internal ACME thread with a pitch diameter of approximately 1.25", so it is fairly large. The tolerance on the "timing dimension" is +/-.0015. I have been using repro-rubber mold compound on the optical comparator, but this is not practical for any kind of regular inspection - only first articles.
I'd appreciate any advice.
I'm trying to find a way to measure this. The thread is an internal ACME thread with a pitch diameter of approximately 1.25", so it is fairly large. The tolerance on the "timing dimension" is +/-.0015. I have been using repro-rubber mold compound on the optical comparator, but this is not practical for any kind of regular inspection - only first articles.
I'd appreciate any advice.





RE: Does anyone have experience with thread "timing?"
*Of course, the verification would only be valid if the thread elements (pitch diameter, thread form, thread lead, etc...) are within acceptable limits. The thread elements would have to be verified independantly.
rp
RE: Does anyone have experience with thread "timing?"
Or, similarly, a 'perfect master' of the mating part, made by a gage maker.
It would be easier for the only serious clocked threads with which I have experience, torpedo tube breech rings.
Mike Halloran
Pembroke Pines, FL, USA
RE: Does anyone have experience with thread "timing?"
RE: Does anyone have experience with thread "timing?"
Thanks for your response.
RE: Does anyone have experience with thread "timing?"
RE: Does anyone have experience with thread "timing?"
RE: Does anyone have experience with thread "timing?"
Old scool gunsmithing.
RE: Does anyone have experience with thread "timing?"
Hole location plugs
You might be able to use this type with by swinging an indicator if the pin is long enough.
http://ww
Thread Squareness Gages.
Page 37 of the pdf.
http://www.southwesterngage.com/Hemcopdf.pdf
Essentially the same as above.
ht
A little different approach using an expanding arbor.
See page 7
h
RE: Does anyone have experience with thread "timing?"
unclesyd: Thanks for the links - I was actually wondering how to check true position of a pitch diameter. The pdf and last link you provided looks like a solution.
I appreciate all the responses guys, thank you.