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using .2 and .3 probes for the first time

rke1229
Hey Guys im having a lot of trouble trying to measure with .2mm and .3mm probes. Iv turned down the touch speed to 2 im not scanning. im only measuring small circles with 5 to 8 hits. It seems like I have to recalibrate them 1 to 2 times a day.
I have a large cylinder with flat bottom holes in its OD wall. In the holes are ball bearing that are pressed it. I only have a small amount of land available to measure the hole. I can measure 1 to 3 parts then I will start to have alarms saying the probe became unseated or that it couldn't retract. Usually once I calibrate it will work ok. Sometimes Ill have to recalibrate with the master probe. As you can imagine this is eating up a lot of time. If anyone has any advice I would appreciate it.
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  • my apologies, I misunderstood.
    --so you are measuring a deformed cylinder wall (the only way a spherical ball isn't falling out, is if someone swaged/pinged the cylinder walls after inserting the ball, yes)?

    This is measuring a post-processed feature. Never a good practice.

    If you are expected to verify that the diameter of the deformation is sufficient to retain the ball... You will never nail this correctly with a CMM.
    There's just no way you can control measuring the high points of that swaged cylinder wall.

    I would recommend either verifying this diameter prior to the ball being inserted (if you can)
    -or-
    Making a functional go/nogo gage, with a concave sphere at the tips (concave to clear the bearing's max diameter). You can even use this as an offset pin to locate the hole if that's your necessary goal (and not just size). ​
  • in reply to louisd
    Another option is to use vision to measure this diameter. Comparator or VMM with some oblique-angle lighting should be capable of extracting that bore diameter after being deformed.
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