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Weird numbers from Romer at machine

GOFOBROKE
Has anyone seen weird numbers out of their Romer Arm in tight spots (close to the arm) at the machine? We could not get the Romer to check anywhere near close to the hand gages (Verniers, PiTape) at the machine (.005-.010) undersized... I brought 3 smaller diameters to the machine, never moved the Romer Arm, and they checked perfectly, one of them was a Ring Gage and the Romer checked it within .0001... While taking points on the actual part, we had the arm in some contorted positions, but it still allowed us to take the points, which makes me curious if anyone else has had the same issue??? The inspectors first thought was a calibration issue, then a setting in the software, but I could not find any abnormalities with it...

As added info, we tried moving the arm on the machine, re-calibrating and even tried mounting it outside the machine on something, but didn't have anything sturdy enough to keep it locked in place...
  • You keep mentioning "the machine". What machine?

    Measuring too close to the base of the arm can induce weird numbers because the encoders have an upper and lower limit. When the arm is extended all the way straight, or bent all the way in, the axis hits it limit.
  • You keep mentioning "the machine". What machine?

    Measuring too close to the base of the arm can induce weird numbers because the encoders have an upper and lower limit. When the arm is extended all the way straight, or bent all the way in, the axis hits it limit.

    I am referring to the lathe the part is being cut on... Sorry... We have come to the conclusion we are going to have to invest in a stand for the arm in these situations... What you explain is probably why we are seeing the inconsistency...
  • It could be a setup issue for sure if it is not stable. All is fine when you don't put much pressure on the arm when taking hits. When you try and bend the arm into tight places you need to ensure your setup is stable. With that Vinni is correct.

    Have you done a length bar check to check for the accuracy and repeatability of the arm? I had one arm that had a faulty encoder when you turned the wrist toward the arm.
  • I am referring to the lathe the part is being cut on... Sorry... We have come to the conclusion we are going to have to invest in a stand for the arm in these situations... What you explain is probably why we are seeing the inconsistency...

    Coming to the game late here but it could be an interference issue. I never suggest mounting arms directly to the machine since it can cause all sorts of grounding / interference issues especially when using bluetooth but not limited to. Measuring at the limits of the encoders should not produce bad numbers unless something is wrong with your arm.
  • Coming to the game late here but it could be an interference issue. I never suggest mounting arms directly to the machine since it can cause all sorts of grounding / interference issues especially when using bluetooth but not limited to. Measuring at the limits of the encoders should not produce bad numbers unless something is wrong with your arm.

    I was referring to the fact that the arm is incapable of measuring at the limit of the encoder (it causes a live message on screen saying an axis is at the limit, and will not allow data to be collected at all.) Not that the arm might have issues of accuracy near the limits. Near the base of the arm is when the machine is in home position, and you are unlikely to collect much data very near the base of the arm (which a hard probe can't even physically reach.)
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