How would one calculate pitch diameter for external threads on a CMM and verify that the results are correct. I need to check some pretty large acme threads im not too sure about the nominal dimensions.
We have thread disk, software that is used to calculate the dimensions of most types of threads, UN, Acme, Stub Acme, Buttress. I know the pitch dia of this thread that I am measuring.
What I am trying to measure right now is the center of a threaded hole. Not worried about the pitch or the minor diameter, i just need the center for now. Its a small thread .375-16 UN and I'm using a 5mm ruby with a simple circle with 4 hits. Then I construct a center point and I'm getting an angle dimension from the hole center point to the center of my part. My tolerance is +/- .5 degrees and i'm measuring OOT by 1 degrees. There is a pitch option for the auto circle but I can' t tell if it is truly in the threads.
We have thread disk, software that is used to calculate the dimensions of most types of threads, UN, Acme, Stub Acme, Buttress. I know the pitch dia of this thread that I am measuring.
What I am trying to measure right now is the center of a threaded hole. Not worried about the pitch or the minor diameter, i just need the center for now. Its a small thread .375-16 UN and I'm using a 5mm ruby with a simple circle with 4 hits. Then I construct a center point and I'm getting an angle dimension from the hole center point to the center of my part. My tolerance is +/- .5 degrees and i'm measuring OOT by 1 degrees. There is a pitch option for the auto circle but I can' t tell if it is truly in the threads.
