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Motor shaft is spinning without applying force

Posted: Sun Sep 22, 2019 4:34 am
by ZerwasMOD
I have just finished assembling my first 3D printer from Geeetech ( ... p-944.html)
I am now running into a problem on the X-Axis. The stepper motor moves fine in positive direction, but towards home direction it is not moving the extruder assembly.
I already went through hours of forum reading. It is not the case home is not set. I have went through home setting with the other axises, they are fine.
The actual problem is that when the motor gets some load in negative direction, the shaft spinns free without giving drive on the belt. In positve direction, all is good. If I remove the belt, so that there is no load, it spins fine in both directions. I tried it with loosen the belt, same result, nor drive in negative direction.
I changed the motor with the motor of y axis, and it runs fine on the y axis. But then the new motor on the x - axis shows the same behaviour. The shaft, when has some load to spin, spins free without applying any force.
I also removed to motor out of the printer, flat on the table and let it spin. If i move it forward and hold the shaft with my fingers it applies the force but when spinning in negative directon the force is not put on the shaft but the shaft spinns in the motor.
I have no clue how to solve it...

Re: Motor shaft is spinning without applying force

Posted: Sun Sep 22, 2019 5:22 pm
by _kaktus_
From your description, I assume the engine is in good working order. You confirmed this by replacing it with a Y axis motor.

So we can assume that the control is failing. :idea:

It is good practice to use oil.
  • Have you tried to adjust the motor current in the stepstick module :?:
  • Have you tried to replace the stepstick modules :?: