MH20i command?

[steve morton]

Hi all, i have a mh20i probe head that is not responding in the program. if i use A0B0, 9090, AND 90-90 FOR A PROGRAM THE MACHINE CALIBRATES THE TIPS FINE OFF MY CALIBRATION BALL, BUT IN THE PROBRAM THE ANGLES ARE NOT BEING RECOGNISED. FOR EXAMPLE I DO AN ALIGNMENT ON TOP OF THE PART,MEASURE MY FEATURES AND MOVE TO A CLEAR AREA(YES BY THE WAY I AM USING ALL MOVE POINTS) INSERT HARDWARE( PROBE)90-90 AND MANUALLY DO A SIDE HOLE. WHEN I RUN THE PROGRAM AND I GET TO THAT POINT I GET PROMPTED TO ROTATE THE HEAD BUT ON EXECUTION THE PROBE WANTS TO CRASH RIGHT THROUGH THE PART. HAS ANYONE HAD EXPERIENCE WITH THIS HEAD?

[Don Ruggieri]

try this

I wonder if the probe is properly calibrated, try this .

Make a copy of your original program. Delete everything after the alignment. I assume the alignment uses A0B0?

Execute the program to the end of the alignment. Now add a command to rotate the wrist to one of the other angles, then turn the probe to that angle, and now move the stylus as close as possible near to the origin. See if the XYZ readouts are 0/0/0

If the probe is properly calibrated all angles should read 0/0/0 for the XYZ when the stylus is near the origin. You can most easily do this with a sphere for measurement. Just measure the sphere with A0B0 and then set the origin to it. Now select and turn to each other angle, 1 at a time, and move it over the center of the sphere. Only Z+ should show a deviation roughly equal to the radius of the sphere.

[dccfreak]

Dumb question, but, are you changing your workplane before measuring the hole on the side? I'm not really familiar with the MH20i, but I have a customer that has one and I have used his machine from time to time, and I noticed that his machine will not automatically detect if the feature is in a different workplane like my machines with the PH10's do. I don't know if this is something having to do with manual indexing heads or if his PC-DMIS installation is jacked up, but, I just thought I would throw that out there.