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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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  • I'll look into that. Thanks.

    EDIT: Ok, so I read through a couple "heated" threads about cylinder probes. I understand reason WHY they are inaccurate, but I think in my situation that doesn't apply. I only use the cylinder probe for checking threads that have a true position that needs an accurate diameter for MMC purposes. Typically at A0B0. I've also used the cylinder probe to check a sheetmetal part off the waterjet with some serious draft angles and large-ish tolerances. It was run on the CMM because the sheer amount of dimensions that needed to be checked.

    In my case, the cylinder probe works just fine.


    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.
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  • I'll look into that. Thanks.

    EDIT: Ok, so I read through a couple "heated" threads about cylinder probes. I understand reason WHY they are inaccurate, but I think in my situation that doesn't apply. I only use the cylinder probe for checking threads that have a true position that needs an accurate diameter for MMC purposes. Typically at A0B0. I've also used the cylinder probe to check a sheetmetal part off the waterjet with some serious draft angles and large-ish tolerances. It was run on the CMM because the sheer amount of dimensions that needed to be checked.

    In my case, the cylinder probe works just fine.


    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.
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