Hey folks - Ordered the MPCNC kit from the store here, everything was working well enough. Couple of test cuts went well. Now I’m having an issue that I can’t explain. Any movement on the Y-Axis of the Mini Rambo results in angry “grinding” sounds from both motors. Moving the connector from the Y-Axis to the X-Axis on the board and attempting to move works fine. Link to a video of what’s going on is below.
The face that the two Y-axis motors turn correctly while on the X-Axis connector, but not on the Y-Axis connector makes me think it’s the board. The X-Axis motors exhibit the same behavior on the Y-Axis connector. Anyone have some advice for me?
I tested continuity from the solder joints on the mini Rambo Y Connector through to the connector on each Y-axis motor, and then between the two motors. No issues found. Those the pins your referring to?
I was referring to the stepper wiring harness, but sounds like you checked the whole kit and caboodle. What happens if you connect the y steppers to the x port on the rambo?
I was wondering if there was a higher resistance on the fuse or power to the Y stepper leading to a detrimental voltage drop. Just a thought before diving into troubleshooting the board.
If you can’t figure it out you can reassign the bad axis to the open driver (in the pins file for your board). I single failed coil on these boards is unlikely but when wired in series you always have a spare.
Check the solder joint and see if there is insufficient solder on the legs of the connector or a solder bridge. Also, try reloading firmware, maybe a value got changed
So I have the same issue but on the Z axis (grinding) X and Y work well with the same settings. I tried everything in this post I swapped the wiring and motor from the X axis with no change. Still grinds on the Z even when the motor runs free.
It all points to the board… or some mystery setting in Marlin (I’m stuck here)