Stall detection with 2 motors

noisettetbou

@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

oliof

@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.

noisettetbou

@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.

noisettetbou

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 ?

oliof

Oh two steppers on a single driver? I can see how that will be bothersome/impossible. Maybe if you drive each motor independently ...

noisettetbou

@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...

Phaedrux

I think an endstop switch might be in your future.

noisettetbou

@Phaedrux
I think too... but I would like to understand

dc42

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?

oliof

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.

noisettetbou

@dc42 @Phaedrux @oliof
dc42 has reason. My voltage is enough for each axis but limit for all axis in the same time.
So i've decided to installing a Duex5.