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Measuring Threads on the CMM...

Good evening,
What is the best way to measure threads on the CMM? I would just use a thread gage and put it in the report but I was asked to write them in the program. Thank you in advance.
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  • Form errors also affect position......

    Using the pitch function in auto circles/ auto cylinders generally works well. Threads have to be well formed.

    Difficult if not impossible to get a highly accurate minor thread diameter using a CMM. Major and Pitch Diameters are impossible.


    I have used threaded inserts to improve position results but they are a royal pain to remove and replace. They get lost easily and you will forget to put one in on the hour-long program for the hot part that you're running.


    My best effort was a set of bottle brushes to remove any debris, burrs after pushing a pin into the minor diameter to "clean up the peaks". True position locating inserts for threads was deemed unnecessary at my old job where they didn't see the value of buying locators or really anything that was requested to increase our capabilities and accuracy. My new job already has a set for every type of thread they machine along with all the other cool metrology toys I never had.
    Those long programs can be frustrating...I'm currently measuring a batch of 80 parts that have a 30-minute-long program. Disappointed
  • That's crazy...I think the longest program I've ever written was just under an hour. And it was just for an FAI. Smiley
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