Duet 3 3.1.1 Emergency stop in DWC = Z Movement

wdenker

@Phaedrux corexy using quad lead screws. I can get the output Monday.

Phaedrux

Is the bed quite heavy? Are you sure the motors are driving the bed and not just the bed auto rotating down when the motor hold is released?

deckingman

@Phaedrux said in Duet 3 3.1.1 Emergency stop in DWC = Z Movement:

Is the bed quite heavy? Are you sure the motors are driving the bed and not just the bed auto rotating down when the motor hold is released?

I'd wager that is the reason. From the config.g, the steps per mm for Z is set to 400. So assuming 1.8 degree motors and 16X micro stepping, and if my maths is correct, that indicates a lead of 8mm - probably a 2mm pitch, 4 start thread. Emergency stop usually cuts power to the motors so without any power, the weight of the bed acting on that very steep helix might cause the screws to rotate.

wdenker

@deckingman @Phaedrux well no that is not the case because it is moving up not down.

Phaedrux

Well unless there is a quantum anomaly create a gravity well located above the bed I guess we can rule out auto rotation.

Can you show us your wiring and printer setup for some more context?

Do you have any expansion boards? Are you using the Duet 3 in standalone or SBC connected mode?

Can you post the results of an M122?

deckingman

Oh, that is weird!. I'll try hitting emergency stop on my machine and see what happens.

wdenker

@deckingman @Phaedrux I rebooted for the first time after the firmware update and now it is gone. Never had to do this before. Very weird.

deckingman

@wdenker Did you run M98 P"config.g" after updating the firmware? I think this is necessary if you have expansion boards but I'm not sure.

wdenker

@deckingman I didnt

Phaedrux

So it's working properly now?

wdenker

@Phaedrux yup