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ForumCSMIO/IP controllers and Software - discussion forum: CSMIO/IP with simCNC softwareproblem with the exact positionin …

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problem with the exact positioning after the park command from the simCNC GUI

#1 · 12 August 2025, 14:47

Hello, I have a problem with the exact positioning after the park command from the simCNC GUI.
When I set a zero point after referencing, I can approach it exactly with the XY command from the simCNC GUI. When I then execute a park command and use XY again, the position is shifted by 2 to 3 tenths to G54. After switching off the control and referencing again, it is then exact again. G28 0 0 0 is set without offset. I have searched, but cannot find an explanation. Do you have any advice?

Best regards,
Bernhard

#2 · 12 August 2025, 22:23

I continued testing and found that the problem also occurs when I move to the (G54) X0 Y0 position using the handwheel. Here, I also noticed a drift when I repeatedly park and move back to (G54) X0 Y0 using the handwheel. The error increases by 1 tenth per movement in the Y direction. Does anyone have any ideas? I am using JMC IHSV 57 servos.

Best Regards

#3 · 14 August 2025, 12:16

First, check the CSMIO/IP position counters (Menu: Diagnostics → CSMIO/IP Monitor) to see if there is any deviation from the expected position.
If you have servo drives, connect to them and read the position counter from the drive (reset it right after homing is completed).

If the position in both the CSMIO/IP and the drive is correct immediately after homing, but the drive position shifts after some movements, you may have an issue with wiring or step signal polarity.

Also check the mechanics for backlash, and make sure tool diameter compensation is disabled (G40).