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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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  • I don't know how big those balls are, but I can't help but think you might be best off using a larger probe and measuring the balls themselves as spheres.

    Even if you can only measure a small surface area of each ball, you can reduce a lot of measuring error by assuming the diameter of the balls to be nearly perfect. You can measure the balls directly as spheres using a FIXED_RAD math type. That should get you relatively accurate ball position measurements even if you can only measure a small arc of each ball.

    Keep in mind that even a pretty average Grade 25 ball has a diameter tolerance of +/-.0025mm. So, it would be pretty safe to assume those balls are at nominal size. If you want to be even more precise, you can find the certs for the lot of balls that were used. That should tell you the average ball size with even more confidence. For example, Grade 25 balls have a lot diameter variation of only .0006mm. You can then use the average size reported on the cert for your fixed radius measurements to make even more precise location measurements.

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  • I don't know how big those balls are, but I can't help but think you might be best off using a larger probe and measuring the balls themselves as spheres.

    Even if you can only measure a small surface area of each ball, you can reduce a lot of measuring error by assuming the diameter of the balls to be nearly perfect. You can measure the balls directly as spheres using a FIXED_RAD math type. That should get you relatively accurate ball position measurements even if you can only measure a small arc of each ball.

    Keep in mind that even a pretty average Grade 25 ball has a diameter tolerance of +/-.0025mm. So, it would be pretty safe to assume those balls are at nominal size. If you want to be even more precise, you can find the certs for the lot of balls that were used. That should tell you the average ball size with even more confidence. For example, Grade 25 balls have a lot diameter variation of only .0006mm. You can then use the average size reported on the cert for your fixed radius measurements to make even more precise location measurements.

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