How to verify the pitch #of nuts?

Hello all

I was asked a question about pitch: How to verify the pitch of a nut? The reason was about half years ago one supplier CMM programmer cheated on the TP of nuts by manipulating pitch #. Now they asked me how to verify it ... Help please...

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0 louisd 10 months ago

Functional lot acceptance of thread form can only be effectively assessed with a known good counterpart (GO/NOGO rings or plugs).
That might be a contentious statement, so hear me out. You can verify components of the helix, (Pitch, Max/Min dia, angles, radii) to verify the threads should work, but until it passes functional gages, you could absolutely have a "good" part fail in the mating part's threads, in the instance mating part is also functionally close to specified limits.

Can you measure pitch with a CMM? YES. You need to scan (ttp or analog) a line down the axis of the threads. then you need to define a strategy to quantify the max/min peak/valley's of each thread. Extract the Z height of the peaks/valley's and you've got pitch. Size of your probe vs pitch is super important here, as well as your machine's ability to probe normal to thread axis.
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0 KatmandudaMeow 10 months ago in reply to louisd

ya, no thanks haha
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0 KatmandudaMeow 10 months ago in reply to louisd

ya, no thanks haha
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