Dual Y motors and sensorless homing
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I'm building up a modified Openbuilds ACRO system to be a laser cutting and (very) light CNC machine. After killing an Arduino Due, RADDS board, and two TMC2130 stepsticks, I'm done with that crap, and going back to known quality (my Duet Wifi has worked flawlessly in my printer), and as such, I've just ordered a new Duet Wifi.
My configurations for Repetier and MK4Duo had E0 set to drive the second Y stepper, and the firmware had support for driving it that way. Does RepRapFirmware have support for that configuration, or is it just a case of plugging both steppers into the Y headers? Will there be issues with that configuration using sensorless homing?
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You can bind your stepper motors to axis with M584, so no problem there.
https://duet3d.dozuki.com/Wiki/GCode#Section_M584_Set_drive_mapping
As for sensorless homing, it can be tricky to set up as it is. It's usually a good idea to use an endstop switch if at all possible since that's what it's designed to do.
https://duet3d.dozuki.com/Wiki/Stall_detection_and_sensorless_homing
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@phaedrux said in Dual Y motors and sensorless homing:
You can bind your stepper motors to axis with M584, so no problem there.
https://duet3d.dozuki.com/Wiki/GCode#Section_M584_Set_drive_mapping
Oh yeah
As for sensorless homing, it can be tricky to set up as it is. It's usually a good idea to use an endstop switch if at all possible since that's what it's designed to do.
https://duet3d.dozuki.com/Wiki/Stall_detection_and_sensorless_homing
Eh, I don't really need homing at all, as I'll be setting 0,0 to the corner of the work-piece, rather than Axis, sensorless homing was more about "cool factor", and just having it there in case, rather than a necessity.
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@keyz182 if you have two Y steppers that you plan to wire into one connector then another option would be to use the Z connector which already has two plugs. the use M584 to let the Duet know that Y is remapped to the third driver channel.
Note that the Z driver connectors are designed to have both the steppers on series. This means they both see the same current, but only half the voltage so maximum speed will be lower (this might not effect you though). If you wire two steppers into a single plug then you will be connecting them in parrallel so they will see 1/2 the current.
Using two seperate stepper drivers gives you the maximum current and speed however you need to have endstops on each axis to stop them getting out of sync
