Coupler homing fail, possibly mechanical.

Discussion in 'Tool heads & ToolChanger' started by Dylan Hamm, May 18, 2020.

  1. Dylan Hamm

    Dylan Hamm Member

    Apr 17, 2020
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    Everything was working fine for about a week, I got my final tool up and running, and set my pre, and post parameters for pickup location in the config for this tool.

    Next time I hit home all, my coupler stepper rotates to home, and continues attempting to rotate, making a continuous popping sound.

    My guess, after adjusting all the stall limit settings to a much higher sensitivity, is that with the default value of 5, that my stepper stripped itself?

    I just ordered 2 more Coupler stepper motors, with the sound coming from the motor clicking, I don't think that's a stall, has anyone else had issues with their couplers?

    Below is my Config in case I somehow thumbed a self destruct command before restarting:

    ; Configurat; Configuration file for Duet WiFi / Ethernet
    ; executed by the firmware on start-up

    ; General preferences
    M111 S0 ; Debugging off
    G21 ; Work in millimetres
    G90 ; Send absolute coordinates...
    M83 ; ...but relative extruder moves
    M555 P2 ; Set firmware compatibility to look like Marlin

    ; Network
    ; Read
    M550 P"ToolChanger" ; Set machine name
    M552 S1 ; Enable Networking
    M586 P0 S1 ; Enable HTTP
    M586 P1 S0 ; Disable FTP
    M586 P2 S0 ; Disable Telnet

    M667 S1 ; Select CoreXY mode

    ; Endstops
    M574 X1 Y1 S3 ; Set X / Y endstop stall detection
    M574 Z1 S2 ; Set Z endstop probe
    M558 P7 X0 Y0 Z2 H3 F360 I0 T20000 ; Set Z probe type to switch, the axes for which it is used and the dive height + speeds
    G31 P200 X0 Y0 Z0 ; Set Z probe trigger value, offset and trigger height
    M557 X10:290 Y20:180 S40 ; Define mesh grid

    ; Drive direction
    M569 P0 S0 ; Drive 0 X
    M569 P1 S0 ; Drive 1 Y
    M569 P2 S1 ; Drive 2 Z
    M569 P9 S0 ; Drive 3 E0
    M569 P3 S1 ; Drive 4 E3
    M569 P6 S0 ; Drive 5 E2
    M569 P5 S1 ; Drive 6 UNUSED
    M569 P7 S0 ; Drive 7 COUPLER
    M569 P8 S0 ; Drive 8 UNUSED
    M569 P9 S0 ; Drive 9 UNUSED

    M584 X0 Y1 Z2 C7 E9:6:3 ; Apply custom drive mapping
    M208 X-35:328.5 Y-49:243 Z0:300 C0:500 S0 ; Set axis maxima & minima
    M350 E8:8:8:8 C8 I0 ; Configure microstepping without interpolation
    M350 X16 Y16 Z16 I1 ; Configure microstepping with interpolation
    M92 X100 Y100 Z1600 C100 E417:417:417:417 ; Set steps per mm
    M566 X400 Y400 Z8 C2 E2:2:2:2 ; Set maximum instantaneous speed changes (mm/min)
    M203 X35000 Y35000 Z1200 C5000 E5000:5000:5000:5000 ; Set maximum speeds (mm/min)
    M201 X6000 Y6000 Z400 C400 E2500:2500:2500:2500 ; Set accelerations (mm/s^2)
    M906 X2000 Y2000 Z1330 C400 E1680:1680:1680:1680 I30 ; Set motor currents (mA) and motor idle factor in percent
    M84 S120 ; Set idle timeout

    ;Stall Detection
    M915 C S-10 F0 H200 R4700 ; Coupler
    ;Stall reduced power
    M913 C50

    ;Stall Detection
    M915 X Y Z S5 F0 H400 R4700 ; X / Y Axes (Added Z in case of probe failure)

    ; Heaters
    M305 P0 T100000 B4138 C0 ; Set thermistor
    M143 H0 S225 ; Set temperature limit for heater 0 to 225C

    M305 S"T0" P1 R4700 T100000 B4388 ; Set thermistor
    M143 H1 S300 A0 C0 ; Set temperature limit for heater 1 to 325C

    M305 S"T1" P2 R4700 T100000 B4388 ; Set thermistor
    M143 H2 S300 ; Set temperature limit for heater 2 to 300C

    M305 S"T2" P3 R4700 T100000 B4388 ;Set thermistor
    M143 H3 S300 ; Set temperature limit for heater 3 to 300C

    M305 S"T3" P4 X200 ; Set thermistor (PT100 sensor settings)
    M143 H4 S300 ; Set temperature limit for heater 4 to 300C

    ; Tools
    M563 P0 S"T0" D0 H1 ; Define tool 0
    G10 P0 X0 Y0 Z0 ; Reset tool 0 axis offsets
    G10 P0 R0 S0 ; Reset initial tool 0 active and standby temperatures to 0C

    M563 P1 S"T1" D1 H2 ; Define tool 1
    G10 P1 X0 Y0 Z0 ; Reset tool 1 axis offsets
    G10 P1 R0 S0 ; Reset initial tool 1 active and standby temperatures to 0C

    M563 P2 S"T2" D2 H3 ; Define tool 2
    G10 P2 X0 Y0 Z0 ; Reset tool 2 axis offsets
    G10 P2 R0 S0 ; Reset initial tool 2 active and standby temperatures to 0C

    M563 P3 S"T3" D3 H4 ; Define tool 3
    G10 P3 X0 Y0 Z0 ; Reset tool 3 axis offsets
    G10 P3 R0 S0 ; Reset initial tool 3 active and standby temperatures to 0C

    ; Fans
    M106 P0 S0 ; UNUSED
    M106 P1 S255 H1 T70 ; T0 HE
    M106 P2 S0 ; T0 PCF
    M106 P3 S255 H2 T70 ; T1 HE
    M106 P4 S0 ; T1 PCF
    M106 P5 S255 H3 T70 ; T2 HE
    M106 P6 S0 ; T2 PCF
    M106 P4 S255 H4 T70 ; T3 HE
    M106 P3 S0 ; T3 PCF

    M593 F50 ; cancel ringing at 50Hz (
    ;M376 H15 ; bed compensation taper

    ;tool offsets
    G10 P0 X16.5 Y72.5 Z-8.55 ; T0
    G10 P1 X-9 Y39 Z-5 ; T1
    G10 P2 X16.5 Y72.5 Z-8.55 ; T2
    G10 P3 X-9 Y39 Z-5 ; T3

    ;deselect tools

    ;M572 D0 S0.2 ; pressure advance T0
    ;M572 D1 S0.2 ; pressure advance T1
    ;M572 D2 S0.2 ; pressure advance T2
    ;M572 D3 S0.2 ; pressure advance T3
  2. jason lipavsky

    Jul 21, 2018
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    i cant seem to get the stall to work on the coupler motor at all and now its stripped and doesnt move anymore, it was also getting really hot ant its set to 400ma in the config, been using duet boards on 4 machines for a few years now but having issues with this setup
  3. jason lipavsky

    Jul 21, 2018
    Likes Received:
    have you figured out a solution yet? my new coupler motor is going to be here today and not trying to fuck this one up right away
  4. dc42

    dc42 Well-Known Member

    Aug 16, 2016
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    I gave up trying to get stall detection working on the coupler motor. You can tune it to work when the motor is cold, but then it reports a stall immediately when the motor is hot. Or, if you increase the M915 S parameter so that it works when the motor is hot, it doesn't register a stall when the motor is cold.

    I reverted to Greg's C axis settings, or something like them. The motor does get hot if you run it continuously at 400mA; however Greg's settings keep the motor at lower current most of the time, and only increase it to 400mA when turning the motor.

    You can find my settings at

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