I was cutting some plastic today and all of a sudden one of my steppers started acting up. I have linked a video
I am using an SKR Pro with 2209 drivers and dual end stops, its been running flawlessly.
I have checked all connections, wiring, bearings, everything I can think of. I can shut off the unit and move it by hand and it’s smooth all the way through travel. I swapped the drivers around to make sure it wasn’t a driver problem. I loosened the belts and ran the motor without any resistance and it runs fine, but as soon as I put the belt back on it starts doing this again. I think maybe the stepper motor itself? It is only this one motor and it happens either direction.
Grub screws are tight. M122 doesn’t show anything out of normal
Well I swapped a stepper and it’s doing the same thing so definitely not a motor
The video makes it look as if the motor goes cranky when it passes an opening in the spoilboard- but it can only be a coincidence…
Well I figured it out. I traced it down to a bad wire to that stepper. I am using the tape measure trick for wire management and when the tape would flex in a certain spot it was causing the motor to miss steps. I have pulled all the wire and it actually looks fine, but I guess there is a broken spot somewhere.
I will get the wires replaced and should be good to go…
The good news is I now have all new firmware loaded and have thoroughly gone through the whole machine.
That’s great! Should be good for a while now.
I am surprised the tmc didn’t say OLA or OLB from M122.
New wires to that stepper solved the problem.
My guess is it was reading fine in the position that I ran the M122? No idea… crazy issue but solved. Thanks for the help!