Hi. Hope all is well.
I searched for this many ways and could not find anything.
we have 7107, PCDMIS 2014.1 Leitz probe, working in MM
We have over 15 different tips that we use, so we run a calibration of tips used for each routine when running each routine.
After calibration, we run a "cal sphere test" and measure the cal sphere with all the angles of each styli used on the routine. We start by measuring the cal sphere test manually with the master tip with 5 points ( 4 on the equator and 1 on top ) and set that as the origin. Then the master tip in DCC mode to measure the cal sphere again and set the DCC measured sphere as the final origin.
For example, using a 1x20 tip with A90B-900, A90B0, A90B90, A90B180, our cal sphere test ( DCC mode ) would measure the cal sphere with the master tip 15 points at 4 level ( each stylus and stylus angle ) and make this the first DCC measurement with master tip as origin, then put up the master tip, pick up 1x20, put up 1x20, pick up master tip and measure cal sphere again. This allows for checking the wrist and weight balancing by putting up the styli and picking it up again, and making sure the cmm is repeating the measurement.
Puts up master tips and picks up the 1x20 and measure the cal sphere with all 4 tip angles, then puts up the 1x20, picks up the master tip, puts up the master tip and picks up the 1x20 and again measure the cal sphere with all 4 tip angles.
we are looking for results of each stylus angle measurement such that the XYZ nominal = 0 ± 0.005 and the diameter is the cal sphere diameter ± 0.005
We do this cal sphere test after calibration and before running parts, and then again after finishing the part/lot inspection to make sure that the CMM is measuring correctly before and after part inspection.
We change parts on each cmm from one shift to another. Rarely does a lot not get finished on a shift and the next shift has to continue the lot inspection.
Some of these cal sphere test can eat up some time on the clock.
I am just curious
1. how many of you do this, or do not?
2. recommend this or not? ( Hexagon recommend this when we first got our 7107.)
3. If a lot passed, consider to forgo the cal sphere test after the lot inspection was complete?
4. Only run the cal sphere test after a lot inspection if any of the parts fail?
We have had a few probes go bad ( operators crashing them, faulty, undocumented enhancement in PCDMIS that make a probe take off in a direction it is not supposed to go and crash )
and finding these bad probes would not have happened if not for the cal sphere test, and not failing good parts on rare occasions.
I am for doing the testing before and after.
Just wanted to get a feel for what others may or may not do and their thoughts.. for those willing to respond.
Thanks
all the best
I searched for this many ways and could not find anything.
we have 7107, PCDMIS 2014.1 Leitz probe, working in MM
We have over 15 different tips that we use, so we run a calibration of tips used for each routine when running each routine.
After calibration, we run a "cal sphere test" and measure the cal sphere with all the angles of each styli used on the routine. We start by measuring the cal sphere test manually with the master tip with 5 points ( 4 on the equator and 1 on top ) and set that as the origin. Then the master tip in DCC mode to measure the cal sphere again and set the DCC measured sphere as the final origin.
For example, using a 1x20 tip with A90B-900, A90B0, A90B90, A90B180, our cal sphere test ( DCC mode ) would measure the cal sphere with the master tip 15 points at 4 level ( each stylus and stylus angle ) and make this the first DCC measurement with master tip as origin, then put up the master tip, pick up 1x20, put up 1x20, pick up master tip and measure cal sphere again. This allows for checking the wrist and weight balancing by putting up the styli and picking it up again, and making sure the cmm is repeating the measurement.
Puts up master tips and picks up the 1x20 and measure the cal sphere with all 4 tip angles, then puts up the 1x20, picks up the master tip, puts up the master tip and picks up the 1x20 and again measure the cal sphere with all 4 tip angles.
we are looking for results of each stylus angle measurement such that the XYZ nominal = 0 ± 0.005 and the diameter is the cal sphere diameter ± 0.005
We do this cal sphere test after calibration and before running parts, and then again after finishing the part/lot inspection to make sure that the CMM is measuring correctly before and after part inspection.
We change parts on each cmm from one shift to another. Rarely does a lot not get finished on a shift and the next shift has to continue the lot inspection.
Some of these cal sphere test can eat up some time on the clock.
I am just curious
1. how many of you do this, or do not?
2. recommend this or not? ( Hexagon recommend this when we first got our 7107.)
3. If a lot passed, consider to forgo the cal sphere test after the lot inspection was complete?
4. Only run the cal sphere test after a lot inspection if any of the parts fail?
We have had a few probes go bad ( operators crashing them, faulty, undocumented enhancement in PCDMIS that make a probe take off in a direction it is not supposed to go and crash )
and finding these bad probes would not have happened if not for the cal sphere test, and not failing good parts on rare occasions.
I am for doing the testing before and after.
Just wanted to get a feel for what others may or may not do and their thoughts.. for those willing to respond.
Thanks
all the best
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