Stall detection with 2 motors
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@Phaedrux
Thanks for the calculation. I've confused the units of torque.I've tried speeds up to 300 mm/s and differents current between 20 and 100% but nothing.
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When you say the motors rotate in opposite directions, what do you mean?
Can you post a photo of the printer?
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@Phaedrux
That's a link to a photo of Y axis :
https://photos.app.goo.gl/oeFLBnE1iaKtcJMNA
The motors are biaxials and synchonysed by a shaft -
@noisettetbou possibly crazy talk but could you disable one stepper for homing only? As they're synchronized by a shaft you should be able to live with that.
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@oliof
It's a good idea. I've tried and it is the same problem.
So 2 motors on same driver and the series wiring aren't the source of the problem.
I'm trying to invert drivers. -
I've tried to invert driver with X and always the problem. As if my Y motors aren't compatibles with the stall detection.
Is it possible ? Crazy, no ? -
Oh two steppers on a single driver? I can see how that will be bothersome/impossible. Maybe if you drive each motor independently ...
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@oliof
It's no a problem if current is respected. I use two motors on same driver in X axis and no problem. And I done as you said for trying, so there is only one motor right now, and no good stall detection... -
I think an endstop switch might be in your future.
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@Phaedrux
I think too...
but I would like to understand -
Have you used the motor EMF calculator at reprapfirmware.org to verify that you have enough VIN voltage to drive 2 motors in series without loss of torque?
Duet WiFi hardware designer and firmware engineer
Please do not ask me for Duet support via PM or email, use the forum
http://www.escher3d.com, https://miscsolutions.wordpress.com -
Difference between X and Y is often that Y moves more mass and there for needs better tuning. But I agree that an endstop likely will give you reliable results faster.
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