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problem with fixture plate

pcdmisstudent
Hello everybody

So we have this fixture plate on our cmm with some pins on it.
and all parts we measure are put in a fixture and slided against the pins, so no manual alignment requierment.

problem is that every year when hex comes to calibrate our CMM, he has to take off the fixtureplate
and when he puts it on again, the plate is in a slight different position.

This kinda screws up for alot of our parts because we have to run the manual alignment again.

Has anyone any idea for either
1. A good setup for the plate so its precicily in the same position everytime we remove it and put i back. (Currenctly we put it with 3 bolts in the graphite plate)

or
2. Work with a zero point system so that we align on our fixture plate and all other manual alignments are based on that. so if we remove /put back our fixture plate all we have to do is do a 3/2/1 alignment on fixtureplate. (instead of running manual alignment on every part)

ty guys!
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  • in reply to pcdmisstudent
    It depends how your routines are set up. |It sounds like you have everything coming from STARTUP which is the CMM co-ordinate system (home position), and you are doing a manual alignment for each part. Once executed, do you then unmark the manual alignment and follow it with a DCC alignment? Doing things this way, you are purely relying on the fixture plate not moving and the ability of your parts to locate repeatably on the fixture plate.

    Essentially, if this is the method you are following, executing the manual alignment once and then unmarking it for subsequent runs is doing the same job as recalling an external fixture alignment, it just falls over if the fixture plate moves because you have to re-execute all of your manual alignments again. With a little careful editing, it should be possible to do away with the manual alignments and just recall your external fixture alignment, maybe followed by a few additional translations / rotations to make everything match what your previous, manual alignments were doing.
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