My Primo has developed an odd wobble on the Y axis - it seems like it’s vibrating as it moves. The X axis doesn’t have this issue. Additionally, there’s occasional grinding noises from the Y1 stepper as it returns to 0, but only at around 50ish mm or below. Even then, the grinding is short.
I’ve tried different levels of belt tension on the Y1 belt but haven’t had much success yet. My next thought was to remove the belts, re-square the gantry, then reinstall the belts. Is that the right next step to try or is there something else I should look into first?
That looks more to me like the motor on that side of the axis isn’t being driven. Possible bad wiring to the stepper (Extension cable come undone?) or bad driver.
Power down the machine, and unplug the stepper for that side from your control board. Then power up and repeat your test. Does it behave the same exact way? Then we’ve found your problem.
Both steppers may be moving with the belts in place. That isn’t the question. The question is whether the behavior changes when you’ve disconnected the stepper on the problem side as I mentioned above.
If no change in behavior, you’ve potentially identified that the electronics aren’t driving that stepper and instead it is freewheeling as the overall axis is moving.
Sorry, only in retrospect did I realize A) that came across as dickish B) I neglected to mention that the rotation was with the belts completely disengaged and free from the pulleys. Either way that rotation is under basically no load.
For what it’s worth I powered off, disconnected Y1, moved Y2 normally, then powered off again, reconnected Y1, disconnected Y2, moved Y1 normally, then powered off and reconnected Y2. Maybe loosening and redoing the belts did something because the grinding sound is gone, but the vibration is still there. The entire Y tube shakes whenever Y moves.
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