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    low motor torque

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    Duet Hardware and wiring
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    • Neufraundefined
      Neufra
      last edited by

      Hi,
      i´m currently building a new printer. While doing that, I ran into a problem: My motors output next to no torque, especially in the Z-Axis. I can easily stop them with two fingers.
      The Z-Axis is driven by two of the motors mentioned below, via two 8mm diameter, 1,5mm pitch trapezoidel lead screws.
      If the motors are´t active, I can turn them smoothly, without much resistance. (-> so they are´t mechanically stuck.)

      My setup consists of a Duet 2 Wifi (V1.04c), a Duex 5, 24V Meanwell PSU, and "MT-1704HSM168RE" (or just "E3D - High Torque Motor").

      I already tried using different kind of steppermotors (17HDC1031-20B), different cables, and different stepperdrivers, but nothing helped. (the other motors also hat very little torque)
      I also tested setting the current for Z to 1600mA, that made it better, but I could still stall the motors with two fingers.
      (Im talking about holding torque and torque while moving ->they are both low)

      Here is my "config.g":

      ; Configuration file for Duet WiFi (firmware version 2.03)
      ; executed by the firmware on start-up
      
      ; General preferences
      G90                                     ; send absolute coordinates...
      M83                                     ; ...but relative extruder moves
      M550 P"MGN-Cube"                        ; set printer name
      M667 S1                                 ; select CoreXY mode
      
      ; Network
      M552 S1                                 ; enable network
      M586 P0 S1                              ; enable HTTP
      M586 P1 S0                              ; disable FTP
      M586 P2 S0                              ; disable Telnet
      
      ; Drives
      M569 P0 S0                              ; physical drive 0 goes forwards X
      M569 P1 S0                              ; physical drive 1 goes forwards Y
      M569 P2 S0                              ; physical drive 2 goes forwards Z-L
      M569 P3 S0                              ; physical drive 3 goes forwards Z-R
      M560 P4 S1                              ; physical drive 4 goes forwards E
      M350 X16 Y16 Z16 E16 I1                 ; configure microstepping with interpolation
      M92 X200.00 Y200.00 Z4266.67 E420.00    ; set steps/mm
      M566 X900.00 Y900.00 Z12.00 E120.00     ; set jerk (mm/min)
      M203 X6000.00 Y6000.00 Z90.00 E1200.00  ; set maximum speeds (mm/min)
      M201 X500.00 Y500.00 Z50.00 E250.00     ; set accelerations (mm/s^2)
      M584 X0 Y1 Z2:3 E4                      ; two Z motors connected to driver outputs Z and E0
      M671 X-60:360 Y150:150 S15              ; leadscrews at left (connected to Z) and right (connected to E1) (of X axis)
      M906 X800 Y800 Z1600:1600 E800 I30      ; set motor currents (mA) and motor idle factor in percent
      M84 S30                                 ; Set idle timeout
      
      ; Axis Limits
      M208 X0 Y0 Z0 S1                        ; set axis min
      M208 X300 Y300 Z365 S0                  ; set axis max
      
      ; Endstops
      M574 X1 Y1 S1                           ; set active high endstops
      M574 Z1 S2                              ; set endstop controlled by probe
      
      ; Z-Probe
      M558 P1 H5 F120 T6000                   ; set Z probe type to IR-Probe and the dive height + speed
      G31 P500 X0 Y0 Z2.5                     ; set Z probe trigger value, offset and trigger height
      M557 X0:280 Y5:300 S80                  ; define mesh grid
      
      ; Heaters
      M307 H0 B0 S1.00                        ; disable bang-bang mode for the bed heater and set PWM limit
      M305 P0 T100000 B4138 R4700             ; set thermistor + ADC parameters for heater 0
      M143 H0 S120                            ; set temperature limit for heater 0 to 120C
      M305 P1 T100000 B4138 R4700             ; set thermistor + ADC parameters for heater 1
      M143 H1 S280                            ; set temperature limit for heater 1 to 280C
      
      ; Fans
      M106 P0 S0 I0 F500 H-1                  ; set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
      M106 P1 S1 I0 F500 H1 T50               ; set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
      
      ; Tools
      M563 P0 D0 H1 F0                        ; define tool 0
      G10 P0 X0 Y0 Z0                         ; set tool 0 axis offsets
      G10 P0 R0 S0                            ; set initial tool 0 active and standby temperatures to 0C
      
      ; Custom Configuration
      
      

      and some other information:

      M906
      Motor current (mA) - X:800, Y:800, Z:1600, E:800, idle factor 30%
      
      M913
      Motor current % of normal - X:100, Y:100, Z:100, E:100
      
      M122
      === Diagnostics ===
      RepRapFirmware for Duet 2 WiFi/Ethernet version 2.02(RTOS) running on Duet WiFi 1.02 or later + DueX5
      Board ID: 08DGM-917DA-G4MS4-6JTDG-3SN6Q-9SX79
      Used output buffers: 3 of 20 (6 max)
      === RTOS ===
      Static ram: 25524
      Dynamic ram: 98516 of which 0 recycled
      Exception stack ram used: 496
      Never used ram: 6536
      Tasks: NETWORK(ready,544) HEAT(blocked,1232) MAIN(running,3852) IDLE(ready,200)
      Owned mutexes:
      === Platform ===
      Last reset 00:29:18 ago, cause: software
      Last software reset at 2020-01-11 10:08, reason: User, spinning module GCodes, available RAM 6716 bytes (slot 3)
      Software reset code 0x0003 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x0441f000 BFAR 0xe000ed38 SP 0xffffffff Task 0x4e49414d
      Error status: 0
      Free file entries: 10
      SD card 0 detected, interface speed: 20.0MBytes/sec
      SD card longest block write time: 2.1ms, max retries 0
      MCU temperature: min 30.9, current 32.6, max 33.1
      Supply voltage: min 23.9, current 24.1, max 24.2, under voltage events: 0, over voltage events: 0, power good: yes
      Driver 0: standstill, SG min/max 0/105
      Driver 1: standstill, SG min/max 0/107
      Driver 2: standstill, SG min/max 0/153
      Driver 3: standstill, SG min/max 0/138
      Driver 4: standstill, SG min/max not available
      Driver 5: standstill, SG min/max not available
      Driver 6: standstill, SG min/max not available
      Driver 7: standstill, SG min/max not available
      Driver 8: standstill, SG min/max not available
      Driver 9: standstill, SG min/max not available
      Date/time: 1970-01-01 00:00:00
      Cache data hit count 4294967295
      Slowest loop: 4.36ms; fastest: 0.07ms
      I2C nak errors 0, send timeouts 0, receive timeouts 0, finishTimeouts 0
      === Move ===
      Hiccups: 0, StepErrors: 0, LaErrors: 0, FreeDm: 240, MinFreeDm: 238, MaxWait: 5870ms, Underruns: 0, 0
      Scheduled moves: 10, completed moves: 10
      Bed compensation in use: none
      Bed probe heights: 0.000 0.000 0.000 0.000 0.000
      === Heat ===
      Bed heaters = 0 -1 -1 -1, chamberHeaters = -1 -1
      === GCodes ===
      Segments left: 0
      Stack records: 1 allocated, 0 in use
      Movement lock held by null
      http is idle in state(s) 0
      telnet is idle in state(s) 0
      file is idle in state(s) 0
      serial is idle in state(s) 0
      aux is idle in state(s) 0
      daemon is idle in state(s) 0
      queue is idle in state(s) 0
      autopause is idle in state(s) 0
      Code queue is empty.
      === Network ===
      Slowest loop: 15.54ms; fastest: 0.00ms
      Responder states: HTTP(0) HTTP(0) HTTP(0) HTTP(0) FTP(0) Telnet(0) Telnet(0)
      HTTP sessions: 1 of 8
      - WiFi -
      Network state is running
      WiFi module is connected to access point 
      Failed messages: pending 0, notready 0, noresp 0
      WiFi firmware version 1.23
      WiFi MAC address dc:4f:22:6e:6f:5b
      WiFi Vcc 3.44, reset reason Turned on by main processor
      WiFi flash size 4194304, free heap 26520
      WiFi IP address 192.168.0.104![1.jpg](/assets/uploads/files/1578735775703-1-resized.jpg) 
      WiFi signal strength -65dBm, reconnections 0, sleep mode modem
      Socket states: 0 0 0 0 0 0 0 0
      

      And here are some pictures of my wiring:
      1.jpg
      2.jpg
      3.jpg
      4.jpg
      5.jpg

      I hope I mentioned everything.

      Sincerely,
      Nico

      1 Reply Last reply Reply Quote 0
      • Vetiundefined
        Veti
        last edited by

        did you verify the phase using a multimeter?

        also see
        https://duet3d.dozuki.com/Wiki/Choosing_and_connecting_stepper_motors#Section_Identifying_the_stepper_motor_phases

        1 Reply Last reply Reply Quote 0
        • Neufraundefined
          Neufra
          last edited by

          Yes, I have ~2,9 ohm / phase, and open-circuit between phases. As it should be.

          1 Reply Last reply Reply Quote 0
          • Vetiundefined
            Veti
            last edited by

            https://duet3d.dozuki.com/Wiki/Gcode#Section_M584_Set_drive_mapping

            M584 must come earlier in config.g than any M350 and M906 commands.

            your thermistor configuration is wrong. B4138 is the default incorrect for you.

            normally what you are observing would be because of faulty wiring.
            you have your connectors the wrong way round. black is towards the vin terminals. but that should only swap directions.

            please update to the latest firmware. (2.05 for now. later go for 3.0)

            1 Reply Last reply Reply Quote 0
            • Neufraundefined
              Neufra
              last edited by Neufra

              I just updated my Firmware to 2.05, and moved M584 above M350.... now only the motor connected to the Z-Output moves. (with the new Firmware and bofore moving the command, it was like before).
              And what do you mean with B4138 beeing wrong? (I only have the Bed Heater/thermistor connected at the moment.)

              Vetiundefined 1 Reply Last reply Reply Quote 0
              • Vetiundefined
                Veti @Neufra
                last edited by

                is there a message about disconnected phase in the console log?

                the beta value 4138 is not the correct value for the thermistors you are using, so it will display the wrong temperature at high temperatures.

                Neufraundefined 1 Reply Last reply Reply Quote 0
                • Neufraundefined
                  Neufra @Veti
                  last edited by

                  No, it doesn´t show any error massages.
                  And thank you for pointing me out about the thermistor values, but how do you know wich kind of thermistors I use?

                  I´m just wondering, why one of the motors stops working when I move M584 to the correct position?

                  ; Configuration file for Duet WiFi (firmware version 2.03)
                  ; executed by the firmware on start-up
                  
                  ; General preferences
                  G90                                     ; send absolute coordinates...
                  M83                                     ; ...but relative extruder moves
                  M550 P"MGN-Cube"                        ; set printer name
                  M667 S1                                 ; select CoreXY mode
                  
                  ; Network
                  M552 S1                                 ; enable network
                  M586 P0 S1                              ; enable HTTP
                  M586 P1 S0                              ; disable FTP
                  M586 P2 S0                              ; disable Telnet
                  
                  ; Drives
                  M569 P0 S0                              ; physical drive 0 goes forwards X
                  M569 P1 S0                              ; physical drive 1 goes forwards Y
                  M569 P2 S0                              ; physical drive 2 goes forwards Z-L
                  M569 P3 S0                              ; physical drive 3 goes forwards Z-R
                  M560 P4 S1                              ; physical drive 4 goes forwards E
                  M584 X0 Y1 Z2:3 E4                      ; two Z motors connected to driver outputs Z and E0
                  M671 X-60:360 Y150:150 S15              ; leadscrews at left (connected to Z) and right (connected to E1) (of X axis)
                  M350 X16 Y16 Z16 E16 I1                 ; configure microstepping with interpolation
                  M92 X200.00 Y200.00 Z4266.67 E420.00    ; set steps/mm
                  M566 X900.00 Y900.00 Z12 E120.00        ; set jerk (mm/min)
                  M203 X6000.00 Y6000.00 Z90 E1200.00     ; set maximum speeds (mm/min)
                  M201 X500.00 Y500.00 Z50 E250.00        ; set accelerations (mm/s^2)
                  M906 X800 Y800 Z1600 E800 I30           ; set motor currents (mA) and motor idle factor in percent
                  M84 S5                                  ; Set idle timeout
                  
                  ; Axis Limits
                  M208 X0 Y0 Z0 S1                        ; set axis min
                  M208 X300 Y300 Z365 S0                  ; set axis max
                  
                  ; Endstops
                  M574 X1 Y1 S1                           ; set active high endstops
                  M574 Z1 S2                              ; set endstop controlled by probe
                  
                  ; Z-Probe
                  M558 P1 H5 F120 T6000                   ; set Z probe type to IR-Probe and the dive height + speed
                  G31 P500 X0 Y0 Z2.5                     ; set Z probe trigger value, offset and trigger height
                  M557 X0:280 Y5:300 S80                  ; define mesh grid
                  
                  ; Heaters
                  M307 H0 B0 S1.00                        ; disable bang-bang mode for the bed heater and set PWM limit
                  M305 P0 T100000 B4138 R4700             ; set thermistor + ADC parameters for heater 0
                  M143 H0 S120                            ; set temperature limit for heater 0 to 120C
                  M305 P1 T100000 B4138 R4700             ; set thermistor + ADC parameters for heater 1
                  M143 H1 S280                            ; set temperature limit for heater 1 to 280C
                  
                  ; Fans
                  M106 P0 S0 I0 F500 H-1                  ; set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
                  M106 P1 S1 I0 F500 H1 T50               ; set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
                  
                  ; Tools
                  M563 P0 D0 H1 F0                        ; define tool 0
                  G10 P0 X0 Y0 Z0                         ; set tool 0 axis offsets
                  G10 P0 R0 S0                            ; set initial tool 0 active and standby temperatures to 0C
                  
                  ; Custom Configuration
                  
                  

                  It is right like this, isn´t it?

                  1 Reply Last reply Reply Quote 0
                  • Vetiundefined
                    Veti
                    last edited by

                    @Neufra said in low motor torque:

                    but how do you know wich kind of thermistors I use?

                    which thermistors did you buy?

                    and which motor is not working?

                    Neufraundefined 1 Reply Last reply Reply Quote 0
                    • Neufraundefined
                      Neufra @Veti
                      last edited by

                      I have NTC100K thermistors.
                      If you mean wich motors have little torque, it´s all of them. If you mean wich one stopped working after moving M584, it´s the second Z-Motor (connected to E0)

                      Vetiundefined 1 Reply Last reply Reply Quote 0
                      • Vetiundefined
                        Veti @Neufra
                        last edited by

                        @Neufra said in low motor torque:

                        I have NTC100K thermistors.

                        that just says it has 100k restistance at 25C nothing more. you need a specific type defintion of the thermistor like semitec-104gt-2.

                        for testing can you disconnect the duex5?

                        1 Reply Last reply Reply Quote 0
                        • Neufraundefined
                          Neufra
                          last edited by

                          I don´t know wich specific type of thermistor my bed has, it just says: "Thermistor 100k". (My hotends have those "Semitec-104gt-2" thermistors you mentioned)
                          When I disconect the duex, do I have to change something in the firmware as well?

                          Vetiundefined 1 Reply Last reply Reply Quote 0
                          • Vetiundefined
                            Veti @Neufra
                            last edited by

                            @Neufra said in low motor torque:

                            I don´t know wich specific type of thermistor my bed has, it just says: "Thermistor 100k". (My hotends have those "Semitec-104gt-2" thermistors you mentioned)

                            if its a chinese bed. its most likely a B3950.

                            the semitec is B4725 C7.060000e-8

                            When I disconect the duex, do I have to change something in the firmware as well?

                            no

                            1 Reply Last reply Reply Quote 0
                            • Neufraundefined
                              Neufra
                              last edited by

                              Soo, disconecting the duex doesn´t seem to change anything, the Motor connected to the E0 output still doesn´t move.

                              About the thermistors, I put in the correct values for the Hotends.
                              (I have this heater for my bed. I will contact their support and ask them about the thermistor type!)

                              1 Reply Last reply Reply Quote 0
                              • Vetiundefined
                                Veti
                                last edited by

                                ok connect up the duex5 again and remap the second z to one on the duex5

                                1 Reply Last reply Reply Quote 0
                                • Neufraundefined
                                  Neufra
                                  last edited by

                                  This post is deleted!
                                  1 Reply Last reply Reply Quote 0
                                  • Neufraundefined
                                    Neufra
                                    last edited by

                                    The motor works now, I can´t reverse it, but it works. (I just flipped the connector)

                                    Vetiundefined 1 Reply Last reply Reply Quote 0
                                    • Vetiundefined
                                      Veti @Neufra
                                      last edited by

                                      @Neufra
                                      reversing the connector should only change the direction. maybe a bad crimp job?

                                      1 Reply Last reply Reply Quote 0
                                      • Neufraundefined
                                        Neufra
                                        last edited by

                                        No. That´s not what I mean. The motor works, independently of the connector direction. But I can´t change the motor direction through confi.g, only by reversing the connector.

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                                        • Vetiundefined
                                          Veti
                                          last edited by Veti

                                          @Neufra said in low motor torque:

                                          But I can´t change the motor direction through confi.g, only by reversing the connector.

                                          are you restarting after changing the config.g?
                                          are you editing the config.g in your sys folder?

                                          also try M98 P"/sys/config.g"

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                                          • Neufraundefined
                                            Neufra
                                            last edited by

                                            well, DuetWebControl asks me the following, after any change in config.g:

                                            Reset board?
                                            Would you like to restart your board to apply the updated configuration? 
                                            

                                            I click "yes" there.
                                            And on top of the config.g editor it says:

                                            0:/sys/config.g
                                            

                                            Your command gives me that:

                                            M98 P"/sys/config.g"
                                            HTTP is enabled on port 80
                                            FTP is disabled
                                            TELNET is disabled
                                            Writing to file: 4 S1
                                            Done saving file.
                                            Error: Bad command: 560 P5 S1
                                            
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