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Avoiding the Bottom of the Sphere during Calibration

Cole Bergeron

Hi all-

I have had many calibration questions recently.

Here is the issue:

There are two machines, running the same exact probe and build. The only difference between the two calibration setups is that on the new one, we are using a calibration sphere that is at a 30 degree angle pointing towards the front of the machine. We have set the shank vector accurately so that PC-DMIS is aware of the direction the shank is approaching from.

The probe we are attempting to calibrate is an L probe. It is a 1x10 probe pointing towards the front of the machine on a 50+35mm extension. There is no problem calibrating the A0B0 angle for the probe, but when we get to the A0B180 side (front of the sphere), the probe goes too close to the bottom of the sphere and shanks out on the sphere. This is because PC-DMIS knows that it can take hits on the bottom in this orientation because the sphere is most exposed on the front side. Is there any way I can have it avoid the bottom half of the sphere when calibrating these angles of the L probe?

Thanks.

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  • 0

    With a 1x10mm long probe, seemingly M2 threads going into a 3mm diameter extension?

    So the 10mm long section has a large cone at the M2 end of it, and that's where it is shank-hitting? 

    If so, you would need to adjust the "End Angle" from 90 degrees to a lower amount, like 70 degrees.  Doing this will make the probe calibrate instead of at the sphere's equator, it calibrates above the equator... preventing the shank-hits.

Reply
  • 0

    With a 1x10mm long probe, seemingly M2 threads going into a 3mm diameter extension?

    So the 10mm long section has a large cone at the M2 end of it, and that's where it is shank-hitting? 

    If so, you would need to adjust the "End Angle" from 90 degrees to a lower amount, like 70 degrees.  Doing this will make the probe calibrate instead of at the sphere's equator, it calibrates above the equator... preventing the shank-hits.

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