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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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  • The ball bearings are press fit. But correct the holes most definitely are now deformed from assembling process. The issue is now that the product is for calibration of some sort of surgical robot. They need the exact location of the ball bearings on the part for calibration. What I have been doing is measuring the bores to get them the X,Z locations, then scanning over the center of the ball bearing in relation to the bore to get them the highpoint of the ball bearing. This gets them their Y location. I have been saying everything you said above about the repeatability of checking these small features. The product is to big for our vision systems, but I'm beginning to wonder if it may be worth sending this to hexagon with their big vision systems.

  • in reply to rke1229
    I highly recommend getting pin gages made with a concave end cut into it. Simulate the depth and location using the pins.
    if you know pin is 1.002" long from the theoretical centroid of the concave end, just measure the pin diameter as you do the walls of the cylinder (as close to part face as you can to minimize projected error) to make X Z.
    Then, measure the end of the pin for your Y including whatever known offset the pin's overall length introduces along Y.
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  • in reply to rke1229
    I highly recommend getting pin gages made with a concave end cut into it. Simulate the depth and location using the pins.
    if you know pin is 1.002" long from the theoretical centroid of the concave end, just measure the pin diameter as you do the walls of the cylinder (as close to part face as you can to minimize projected error) to make X Z.
    Then, measure the end of the pin for your Y including whatever known offset the pin's overall length introduces along Y.
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