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Post by lettuce on Oct 2, 2018 2:48:23 GMT
Tonight, out of the blue, the dual stepper setup for the Y axis seems to have lost its sync and the pair appear to now go at different speeds(?) The first symptom was the unit stopping mid-way through a gcode file run (first time ever, unit is generally rock solid). I shut down, cleaned everything, checked connections, restarted, and found that even just jogging the Y axis looks like the left motor is stepping faster than the right: youtu.be/pX5IuPQUOFQHas anyone had any similar problems, or possible solutions? Thanks in advance! |
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Post by Derek the Admin on Oct 2, 2018 3:09:40 GMT
It sounds like a stepper driver has started to fail or one of the set screws on one of the couplers has backed out, allowing free spinning.
I would pull the Y motors, put them on the bench and see if They are actually out of sync. If so, then out of sync one likely is attached to a bad driver.
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Post by lettuce on Oct 2, 2018 3:17:25 GMT
It sounds like a stepper driver has started to fail or one of the set screws on one of the couplers has backed out, allowing free spinning. I would pull the Y motors, put them on the bench and see if They are actually out of sync. If so, then out of sync one likely is attached to a bad driver. I will try that right now. I read a different post about the "sharpie method", and will try that now... |
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Post by lettuce on Oct 2, 2018 3:30:51 GMT
The set screws were all solid, but the sharpie method came back with odd results:
Left stepper seems to be exactly twice the rate of the right one?
Bad stepper driver on left-Y side you think?
Where might I be able to buy a few more if so?
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Post by lettuce on Oct 2, 2018 3:43:43 GMT
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Post by lettuce on Oct 2, 2018 17:34:24 GMT
Update: I swapped the Y stepper drivers, checked all to .65V, and the behavior followed the stepper driver to the <other> motor.
So, it does appear to be a bad stepper driver.
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Post by Bruce on Oct 3, 2018 16:08:05 GMT
Check the jumpers on the CNC Shield before changing the stepper driver. Make sure the jumpers are making good connection, plugged in good. 1) Different Micro stepping rate on the two motors - Check you have the same jumper settings. 2) The Duplicate Y=>A Step or direction jumper switch is not set.
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Post by lettuce on Oct 3, 2018 22:28:32 GMT
Check the jumpers on the CNC Shield before changing the stepper driver. Make sure the jumpers are making good connection, plugged in good. 1) Different Micro stepping rate on the two motors - Check you have the same jumper settings. 2) The Duplicate Y=>A Step or direction jumper switch is not set.
Thanks for the suggestion! I will check that... If the jumpers were not seated fully, I wouldn't expect the problem to follow the stepper driver from A to Y, but it did? From the manual it appears there should be two jumpers on the two left most pins north to south (top-to-bottom) below each stepper driver. I will reseat all of them. |
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