Duet 3 Mini 5+ sensor less homing setup and tune help required
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I think you will find trying to home multiple Z motors with stall detection exceedingly difficult especially through the extra compliance of the gear box.
It looks like you have a probe configured, why not use that?
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@phaedrux thanks for the reply but not an option for this design as i need all the i/o inputs for other things
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@moth4017 Let us know how it goes.
I'm also thinking it's going to be tough to do stall detection through a 4:1 gearbox, so if you get it working, please post the details of your settings here.
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@alankilian I will post up the files when i have it working, ive been trying to sort this problem out for days now, works on the duet2 ok , but it seems the TMC2209 that seems to be making it more difficult.
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My Stepper motor Details
stepper motor XY42STH40-1684A
2.8V
1.68A
1.65 Ohms/Phase
3.2mH/Phase
3.6 g/cm holding torque
54 g/cm ^2 Rotor Inertia
Weight 280g
150 g/cm Detent Torque -
Are you trying to stall it against the print head or the z max end of travel?
@moth4017 said in Duet 3 Mini 5+ sensor less homing setup and tune help required:
M558 P1 C"io3.in" H5 F300 T6000 ; set Z probe type to unmodulated and the dive height + speeds
@moth4017 said in Duet 3 Mini 5+ sensor less homing setup and tune help required:
i need all the i/o inputs for other things
But you have a probe defined...
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@phaedrux
stalling Z at Max to make sure the Bed is close to level on switch/on before doing the 3 Point tramming etc -
Try higher speeds? There needs to be enough back emf to detect a stall.
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@phaedrux Iev tried a few speeds and i did get one of the 3 motors to stall ( this turned out to be a mechanical issue )2 motors went to the physical end stops "skipped steps for 4 seconds" then stopped.
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How out of tram do you expect it to become before doing the auto leveling?
If it's bottoming out at the physical stop doesn't that have the same effect?
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@phaedrux if the Bed goes to Z max the motors make a horrible noise until they all time out, not very elegant when the Stall feature ( sensorless homing) is exactly what i require .
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@moth4017 I am sending z to max to get the bed in a 90% tram position before doing the auto Tram/bed level, the issue i have is that when the power is removed the bed will become out of tram so sending to Z max gets me in the 90% correct position.
Hence the sensor less homing require for Z max with multiple motors. i dont have enough inputs to install 3 extra limit switches .
