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Tru-Pos Locators UNJF thread

Need to measure some threaded holes 1/4-28 UNJF.
Anyone know where I can find plugs for this thread to check location?
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  • No it doesn't.
    You are NOT checking the position of the thread.
    Just the minor diameter.
    That can be accomplished using a normal probe and the pitch function.
    For sheetmetal you can use edge points and control the depth of measurement.


    In my instance checking the minor diameter location is what's needed. Besides that, the minor diameter is what is controlled for MMC. We can't change the diameter of the tap that's establishing the thread. I can't get an accurate measure of the minor diameter with a normal probe and utilizing the pitch function. It may be close, but will never be accurate.

    I could use edge and corner points for sheetmetal parts, and make my program cycle time 2-3 times longer than necessary. Supervisors don't like long cycle times when CNC machines are held up because their parts are waiting to be inspected on our single CMM and I'm taking forever to check a part with ±.030 tolerances off the waterjet.

    I'm not telling you how to do your job, please don't tell me how to do mine.
Reply
  • No it doesn't.
    You are NOT checking the position of the thread.
    Just the minor diameter.
    That can be accomplished using a normal probe and the pitch function.
    For sheetmetal you can use edge points and control the depth of measurement.


    In my instance checking the minor diameter location is what's needed. Besides that, the minor diameter is what is controlled for MMC. We can't change the diameter of the tap that's establishing the thread. I can't get an accurate measure of the minor diameter with a normal probe and utilizing the pitch function. It may be close, but will never be accurate.

    I could use edge and corner points for sheetmetal parts, and make my program cycle time 2-3 times longer than necessary. Supervisors don't like long cycle times when CNC machines are held up because their parts are waiting to be inspected on our single CMM and I'm taking forever to check a part with ±.030 tolerances off the waterjet.

    I'm not telling you how to do your job, please don't tell me how to do mine.
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