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Any suggestions on what might be causing this? High error on the angle.

Hello all. I have been using PC-DMIS at work for a couple of months now and love the software. I would finance my own offline license if I were not paying my car payments but that's another story. I have level 1 training with an 80 hour certificate of achievement so im really determined to learn this software as much as possible. I can transform and align models and create basic programs and dimension them out, but something strange has happened and I cannot explain what is causing it and neither can the guys at work, and they have more experience than I do. It's really strange.

When I'm checking a part with the angle a0b0 I get results which are within tolerance, however when I go to 90 90 angle to check hole location or a profile, after its done taking the circle hit it shows the outline and id say it's a good amount off where it should be, the ET is like .024 which is not possible, however when I check with the opposite 90 90 angle on the same hole, just on the opposite side it shows as good. I thought it was the part or that my alignment was bad, but the guys double checked it and said that there was nothing wrong with my alignment, but its physically impossible that its out that much because I checked it manually with another CMM and visually you would see that amount of outage. I obviously measured/calibrated those angles before use and the results show as being within 1 tenth or less.

The company I worked for hired someone to come calibrate the CMM since it was expiring and the guy doing the calibration said that there was nothing wrong, and that its running great. Even after he did this I got the same error. However, when I take my same program to another DCC CMM with PCDMIS and load and run it, it shows that feature as being good for the same angle that the initial DCC CMM was showing bad. It's also the same setup, its on a 1-2-3 block, just moved the setup to the new machine and same thing. What would be causing this? My fear is that someone crashed it hard, but wouldn't that show it off during calibration? Also my employer allows pretty much everyone to touch the DCC CMM with no training, they don't realize how easy it is to do something wrong. appreciate any help. Thanks
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  • Almost certainly to do with probe calibration.

    Make sure all probe angle used across all probes are calibrated on the reference sphere at the same time.

    Ideally you want to have one probe-tip (typically A0B0 on a short large diameter stylus) and that's the only one you answer 'Yes' to the 'Has the reference sphere has moved...' question.

    All other tips you should answer 'No' to that question.


    Search for Mater probe on the forum and there are dozens of topics discussing this.

    Watch this video to understand what's going on when you calibrate a probe tip.

    https://youtu.be/a_0Kq-kXbwk





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  • Almost certainly to do with probe calibration.

    Make sure all probe angle used across all probes are calibrated on the reference sphere at the same time.

    Ideally you want to have one probe-tip (typically A0B0 on a short large diameter stylus) and that's the only one you answer 'Yes' to the 'Has the reference sphere has moved...' question.

    All other tips you should answer 'No' to that question.


    Search for Mater probe on the forum and there are dozens of topics discussing this.

    Watch this video to understand what's going on when you calibrate a probe tip.

    https://youtu.be/a_0Kq-kXbwk





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