Stepper buzz x moves both x and y

General Discussion
21

If the printer is assembled, how are you determining that both motors move?

22

Look for rotation? Buzzing when you touch?

23

As initially pointed out and reinforced by @jakep_82:

  • The CoreXY is a closed belt system that couples X and Y
  • Moving into one direction (either X or Y) will inevitably cause movement in the other direction as well
  • Pure X or Y movement can only be achieved when both A and B motors move the same distance
  • Electrically and firmware speaking the described issue cannot exist, since there is no crosstalk between independent stepper drivers

While I think this is hunting a phantom, I’m open to be surprised.

The only true proof would be:

  • Remove the belts
  • Run stepper buzz while touching the not-buzzed stepper and if it now moves/vibrates as well, I’d be inclined to follow this further.
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24

If you only buzz X (A) then the print head will move in diagonal direction but the Y (B) motor does not turn.
To get this clear I already asked for those details.
However I can’t explain it…

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25

Solved!

@Sineos had the test that proved it.

Instead of removing the belts I slaked way off on the tension and stepper buzz worked on x and y.
It turned out to be the x carriage was too tight due to me putting in a too long screw that jammed the linear rail carriage.

Thanks to @Sineos for suggesting removing the belts!

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