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    z motors drives faster than the should

    Scheduled Pinned Locked Moved Solved
    Tuning and tweaking
    breakout board
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    • Inno 3Dundefined
      Inno 3D
      last edited by

      Hey everybody,

      I have a little problem with my 4 z motors. When I would like to home the z motors, they drive up very loud, than x and y home normally and when the z motors drives down, i think they would be to fast. 2 z motors don't go further, blocking and making loude noise.

      I'm using external stepper drivers (leadshine DM556) for the z motors with Expansion Breakout Board.

      I think, I have set the stepper driver right.

      Here you have two pictures.

      IMG_20200930_151412[1].jpg

      IMG_20200930_151138[1].jpg
      Motor data sheed
      Screenshot (28).png

      leadshine DM556 datasheet
      DM556m.pdf

      config.g

      ; Configuration file for Duet WiFi (firmware version 3)
      ; executed by the firmware on start-up
      ;
      ; generated by RepRapFirmware Configuration Tool v3.1.4 on Tue Sep 29 2020 15:16:53 GMT+0200 (Mitteleuropäische Sommerzeit)
      
      ; General preferences
      G90                                                                  ; send absolute coordinates...
      M83                                                                  ; ...but relative extruder moves
      M550 P"3D Printer"                                                      ; set printer name
      
      ; Network
      M551 P"****"                                                       ; set password
      M552 S1                                                              ; enable network
      M586 P0 S1                                                           ; enable HTTP
      M586 P1 S0                                                           ; disable FTP
      M586 P2 S0                                                           ; disable Telnet
      
      ; Drives
      M569 P0 S1                                                            ; physical drive 0 goes forwards
      M569 P1 S1                                                            ; physical drive 1 goes forwards
      M569 P5 S1 R1 T2.5:2.5:5:0                                            ; physical drive 5 goes forwards
      M569 P3 S1                                                            ; physical drive 3 goes forwards
      M569 P4 S1                                                            ; physical drive 4 goes forwards
      M569 P6 S1 R1 T2.5:2.5:5:0                                            ; physical drive 6 goes forwards
      M569 P7 S1 R1 T2.5:2.5:5:0                                            ; physical drive 7 goes forwards
      M569 P8 S1 R1 T2.5:2.5:5:0                                                           ; physical drive 8 goes forwards
      M584 X0 Y1:4 Z5:6:7:8 E3                                             ; set drive mapping
      M350 Y256:256 Z4:4:4:4 I0                                            ; configure microstepping without interpolation
      M350 X16 E16 I1                                                      ; configure microstepping with interpolation
      M92 X448.00 Y241.37:241.37 Z1280.00:1280.00:1280.00:1280.00 E420.00  ; set steps per mm
      M566 X900.00 Y900.00:900.00 Z12.00:12.00:12.00:12.00 E120.00         ; set maximum instantaneous speed changes (mm/min)
      M203 X6000.00 Y6000.00:6000.00 Z180.00:180.00:180.00:180.00 E1200.00 ; set maximum speeds (mm/min)
      M201 X500.00 Y500.00:500.00 Z20.00:20.00:20.00:20.00 E250.00         ; set accelerations (mm/s^2)
      M906 X1800 Y1800:1800 Z800:800:800:800 E800 I30                      ; set motor currents (mA) and motor idle factor in per cent
      M84 S30                                                              ; Set idle timeout
      
      ; Axis Limits
      M208 X0 Y0 Z0 S1                                                     ; set axis minima
      M208 X1280 Y2500 Z1500 S0                                            ; set axis maxima
      
      ; Endstops
      M574 X1 S1 P"!xstop"                                                 ; configure active-high endstop for low end on X via pin !xstop
      M574 Y2 S1 P"!ystop"                                                 ; configure active-high endstop for high end on Y via pin !ystop
      M574 Z1 S2                                                           ; configure Z-probe endstop for low end on Z
      
      ; Z-Probe
      M950 S0 C"duex.pwm5"                                                 ; create servo pin 0 for BLTouch
      M558 P9 C"^zprobe.in" H5 F120 T6000                                  ; set Z probe type to bltouch and the dive height + speeds
      G31 P500 X0 Y0 Z2.5                                                  ; set Z probe trigger value, offset and trigger height
      M557 X15:1265 Y15:2485 S20                                           ; define mesh grid
      
      ; Heaters
      M308 S0 P"bedtemp" Y"thermistor" T100000 B4138                       ; configure sensor 0 as thermistor on pin bedtemp
      M950 H0 C"bedheat" T0                                                ; create bed heater output on bedheat and map it to sensor 0
      M307 H0 B1 S1.00                                                     ; enable bang-bang mode for the bed heater and set PWM limit
      M140 H0                                                              ; map heated bed to heater 0
      M143 H0 S120                                                         ; set temperature limit for heater 0 to 120C
      M308 S1 P"spi.cs1" Y"rtd-max31865"                                   ; configure sensor 1 as thermocouple via CS pin spi.cs1
      M950 H1 C"e0heat" T1                                                 ; create nozzle heater output on e0heat and map it to sensor 1
      M307 H1 B0 S1.00                                                     ; disable bang-bang mode for heater  and set PWM limit
      
      ; Fans
      M950 F0 C"fan0" Q500                                                 ; create fan 0 on pin fan0 and set its frequency
      M106 P0 S0 H-1                                                       ; set fan 0 value. Thermostatic control is turned off
      
      ; Tools
      M563 P0 S"Extruder" 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 settings are not defined
      
      ; Miscellaneous
      M575 P1 S1 B57600                                                    ; enable support for PanelDue
      M911 S21 R22 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000"                   ; set voltage thresholds and actions to run on power loss
      

      I don't find the problem.

      Many thanks for your help!

      Best regards

      1 Reply Last reply Reply Quote 0
      • dc42undefined
        dc42 administrators
        last edited by

        You have set your Z steps/mm to 1280 in config.g, however you have set the steps/rev to just 400. That combination implies your leadscrew has a lead (linear movement per turn) of 400/1280 = 0.3125mm. What should it be?

        Steps/rev set to 3200 or 6400 would be more normal.

        Duet WiFi hardware designer and firmware engineer
        Please do not ask me for Duet support via PM or email, use the forum
        http://www.escher3d.com, https://miscsolutions.wordpress.com

        1 Reply Last reply Reply Quote 0
        • Inno 3Dundefined
          Inno 3D
          last edited by

          @dc42 you are so right!!!

          I've set the wrong gear ratio.

          Now it's working!!!

          Thank you very much!!!

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