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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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  • So, you have a tiny amount of exposed shoulder on a cylinder wall, presumably limited between an outer extent of the part and the pressed-in bearing's outer race?
    I would be measuring a plane on the top surface of the bearing OD race,
    leveling and origin to the Bearing's OD race plane,

    -Doing this will eliminate the probe from dragging on the top surface of the bearing if it wasn't pressed-in perfectly square to whatever your current alignment is.-

    Then construct my hits for the circle you're trying to measure with 1/2 the ruby diameter plus 0.001" or so for clearance (0.3mm ruby is 0.0118" diameter) divide by 2, you get ~0.006" then add one thousandth for clearance. Measure the circle at 0.007" above the bearing's OD race plane.
    -If you've got more shoulder wall, bump it up 0.010" or more above the bearing plane.

    If that doesn't work, you can add a thousandth at a time until it does.
    -Or- If you run out of cylinder wall to move up (IE you are measuring a chamfer or are probing up the edge of the cylinder), you can play with your vector angle (instead of perfectly tangent to the cylinder, add 0.1 z vector away from bearing surface, so your prehit and retract are clearing the bearing with a tiny amount of z angle. Just know your measured diameter will have that amount of pythagorean's cosine error induced.
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  • So, you have a tiny amount of exposed shoulder on a cylinder wall, presumably limited between an outer extent of the part and the pressed-in bearing's outer race?
    I would be measuring a plane on the top surface of the bearing OD race,
    leveling and origin to the Bearing's OD race plane,

    -Doing this will eliminate the probe from dragging on the top surface of the bearing if it wasn't pressed-in perfectly square to whatever your current alignment is.-

    Then construct my hits for the circle you're trying to measure with 1/2 the ruby diameter plus 0.001" or so for clearance (0.3mm ruby is 0.0118" diameter) divide by 2, you get ~0.006" then add one thousandth for clearance. Measure the circle at 0.007" above the bearing's OD race plane.
    -If you've got more shoulder wall, bump it up 0.010" or more above the bearing plane.

    If that doesn't work, you can add a thousandth at a time until it does.
    -Or- If you run out of cylinder wall to move up (IE you are measuring a chamfer or are probing up the edge of the cylinder), you can play with your vector angle (instead of perfectly tangent to the cylinder, add 0.1 z vector away from bearing surface, so your prehit and retract are clearing the bearing with a tiny amount of z angle. Just know your measured diameter will have that amount of pythagorean's cosine error induced.
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