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Finding and Verifying Pitch Diameter

acgarcia
Good Afternoon:

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.
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  • Good Afternoon:

    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.

    +1 to what Jimmy said....

    Use 3 wire or 3 pin method to verify the pitch diameter, you will get the nominal, tolerance and pin / wire size from the thread standard.

    They are now checking pitch diameters on master API thread gauges in NIST in the US, using Quindos, PMM's, Scanning probes & styli the same size as the wire diameter.

    Way beyond most mortals, like us....Slight smile HTH
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  • Good Afternoon:

    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.

    +1 to what Jimmy said....

    Use 3 wire or 3 pin method to verify the pitch diameter, you will get the nominal, tolerance and pin / wire size from the thread standard.

    They are now checking pitch diameters on master API thread gauges in NIST in the US, using Quindos, PMM's, Scanning probes & styli the same size as the wire diameter.

    Way beyond most mortals, like us....Slight smile HTH
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