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    Piezo not triggering endstop

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    • interwebsdesignerundefined
      interwebsdesigner
      last edited by interwebsdesigner

      I have a piezo on my hotend. I am setting up a new printer. I have the same setup / settings that work fine on my other printer with duetwifi. I feel like I am doing something wrong here.

      I have the piezo setup, in the duetwifi control panel it shows the pressure when I touch the nozzle. But it is not triggering the endstop. I copied over the same config from the running printer so I am not sure why it wouldn't trigger if the probe shows pressure on the nozzle. See config below


      ; CoreXY sample config file for dc42 Duet firmware by Haga. Please use with care. Some of the settings needs to be changed to work with your printer. Read the duetWiki!
      ;*** https://duet3d.com/wiki/Duet_Wifi_Wiki

      ; Communication and general
      M111 S0 ; Debug off
      M550 BigBot ; Machine name (P + anything you like)
      M551 Preprap ; Machine password (used for FTP connections)
      M540 P0xBE:0xEF:0xDE:0xAD:0xFE:0xED ; MAC Address - If you have more than one Duet on your network, they must all have different MAC addresses, so change the last digits
      M552 S1 ; Enable WiFi
      M555 P2 ; Set output to look like Marlin
      M575 P1 B57600 S1 ; Comms parameters for PanelDue
      M667 S1 ; set CoreXY mode

      ; Machine configuration
      M569 P0 S0 ; X Drive 0 goes forwards (change to S0 to reverse it)
      M569 P1 S1 ; Y Drive 1 goes forwards.
      M569 P2 S1 ; ZaZb - Motors - Forwards
      M569 P3 S1 ; E0 Drive 3 goes forwards 0
      M569 P4 S1 ; E1 Drive 4 goes forwards

      M574 Z2 Y2 S0 ; set endstop configuration (all endstops at high end, active high)
      M574 X1 S1 ; set endstop configuration

      M350 X16 Y16 Z16 E16 I1 ; Set 16x microstepping with interpolation

      M92 X100 Y100 Z400 ; Set axis steps/mm. Check that the printer really move as much as you tell it. Not more and not less.
      M92 E138.4:138.4 ; Set extruder steps/mm. Change this to match your extruder.

      M906 X800 Y800 Z800 E800 ; Set motor currents (mA). Increase if motor is to weak. Lower if motor gets too hot. 800-1000 is good for most.

      M201 X1500 Y1500 Z300 E500 ; Accelerations (mm/s^2). The acceleration, speed and jerk is a setting you can alter to try making the printer to print as nice as possible..
      M203 X12000 Y12000 Z1200 E800 ; Maximum speeds (mm/min)
      M566 X900 Y900 Z24 E800 ; Maximum jerk speeds mm/minute

      M208 X300 Y300 Z450 ; set axis maxima (adjust to suit your machine)
      M208 X0 Y0 Z0 S1 ; set axis minima (adjust to make X=0 and Y=0 the edges of the bed)

      G21 ; Work in millimetres
      G90 ; Send absolute coordinates...
      M83 ; ...but relative extruder moves

      ; Z probe
      M558 P1 I0 R0.2 F500 X0 Y0 Z1 ; Analog Z probe, also used for homing the Z axis
      G31 X0 Y0 Z-0.1 P700 ; Set the probe height and threshold (put your own values here)

      ; Thermistors and heaters

      ;*** You can use S and B parameters to define the parameters of the thermistors you are using. Standard 100k thermistor from E3d is 4388 or 4725.
      M305 P0 T100000 B4388 R4700 H0 L0 ; Put your own H and/or L values here to set the bed thermistor ADC correction
      M305 P1 T100000 B3950 R4700 H0 L0 ; Put your own H and/or L values here to set the first nozzle thermistor ADC correction
      ;M305 P2 T100000 B4388 R4700 H0 L0 ; Put your own H and/or L values here to set the second nozzle thermistor ADC correction

      M570 S120 ;Increase to allow extra heating time if needed

      ;*** Bed Heating Controls & Max Tem
      M143 H0 S140

      ; Fans
      M106 P1 T45 H1 ; enable thermostatic mode for fan 1 at temp 45 degrees. Fan turns on when P1(extruder 1) is above 45 degrees.

      ; Tool definition
      M563 P1 D0 H1 ; Define tool 0
      G10 P1 S0 R0 ; Set tool 0 operating and standby temperatures

      ;*** If you have a dual-nozzle build, un-comment the following 3 lines
      ;M563 P0 D1 H2 ; Define tool 1
      ;G10 P0 S0 R0 ; Set tool 1 operating and standby temperatures

      ;*** If you are using axis compensation, put the figures in the following command
      M556 S78 X0 Y0 Z0 ; Axis compensation here
      M208 S1 Z0 ; set minimum Z
      M501 ; Load Config-Override.g that is created using M500
      T0 ; select first hot end

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      • aidarundefined
        aidar
        last edited by

        Your Z endstop is configured at high end active low.
        And you have defined Z probe as well (this is your piezo i guess), but you didnt tell firmware to use probe as endstop. So edit your M574 commands as needed :
        https://duet3d.dozuki.com/Wiki/Gcode#Section_M574_Set_endstop_configuration

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        • SupraGuyundefined
          SupraGuy
          last edited by

          If you're using the piezo as endstop, then don't use the Z endstop.

          ; Endstops
          M574 X2 Y2 S0                    ; Set active low endstops
          

          This is configured for a PrecisionsPiezo v2 board, I'm pretty sure that any of their other products would be similar, though you might choose different height/speed.

          ; Z Probe
          M558 P8 H8 F780 I1 T9000 R0.8 Z1 ; Set Z probe type to unmodulated and the dive height + speeds
          

          I see that the Z1 parameter is now marked as obsolete.

          P8 sets the piezo as unfiltered, and is somewhat better than P1

          H8 sets the dive height. I wanted a bit more so that I could use really low accel and reach the higher speed when I was debugging.

          F780 was to get 13mm/s. this is faster than needed, and was set that way for debugging when I was dialling things in (The example is from an older backup of my config.g file.)

          I1 to invert the signal,

          T for travel speed. I guess I just wanted "as fast as the axes were defined."

          and R for a delay to let the printer settle and avoid false triggers.

          Lead screw driven printer, powered by Duet 2 Wifi
          MPCNC powered by Duet 2 Wifi
          CoreXY printer driven by Duet 3 6HC
          LowRider CNC powered by Duet 2 Wifi

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          • dc42undefined
            dc42 administrators
            last edited by

            It's your homez.g and homall.g files that we really need to see.

            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

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            • interwebsdesignerundefined
              interwebsdesigner
              last edited by interwebsdesigner

              ;homeall.g

              G91 ; relative mode
              G1 S1 X-240 Y240 F3000 ; course home X or Y
              G1 S1 X-240 ; course home X
              G1 S1 Y240 ; course home Y
              G1 X4 Y-4 F600 ; move away from the endstops
              G1 S1 X-10 ; fine home X
              G1 S1 Y10 ; fine home Y
              G1 S1 Z-240 F3000 ; z home

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              • SupraGuyundefined
                SupraGuy
                last edited by SupraGuy

                The last line is in error. Also, I would modify a couple of the other ones.

                ;homeall.g
                G91                    ; relative positioning
                G1 Z5 F6000 S2         ; lift Z relative to current position
                G1 S1 X-240 Y240 F3000 ; move quickly to X and Y axis endstops and stop there (first pass)
                G1 S1 X-240 F3000      ; coarse home X
                G1 S1 Y240 F3000       ; coarse home Y
                G1 X4 Y-4 F3000        ; back off from endstops
                G1 S1 X-10 F300        ; fine home X
                G1 S1 Y10 F300         ; fine home Y
                G90                    ; absolute positioning
                G1 X120 Y120 F3000     ; center hotend
                G30                    ; Z probe home
                

                This is modified from mine to do the CoreXY specific stuff, with the coarse/fine homing, and dimensions matching to what you might be using. I am assuming that the X=120,Y=120 is the center point of your bed, but it probably does not matter. The important point here is the G30 in order to do the Z probe. I also included (Present in mine) the 5mm lift of the Z axis at the start. This will also ensure that you should have some distance to do the actual Z probe.

                EDIT:

                |The reason why I said that the last line was in error, is that it would require that the piezo sensor be connected to the Z axis endstop pin, instead of to the Z probe pin. It certainly appeared from your config.g line up there that you are using the Z probe input and not the Z endstop on the Duet.

                Lead screw driven printer, powered by Duet 2 Wifi
                MPCNC powered by Duet 2 Wifi
                CoreXY printer driven by Duet 3 6HC
                LowRider CNC powered by Duet 2 Wifi

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                • interwebsdesignerundefined
                  interwebsdesigner
                  last edited by

                  @supraguy said in Piezo not triggering endstop:

                  ;homeall.g
                  G91 ; relative positioning
                  G1 Z5 F6000 S2 ; lift Z relative to current position
                  G1 S1 X-240 Y240 F3000 ; move quickly to X and Y axis endstops and stop there (first pass)
                  G1 S1 X-240 F3000 ; coarse home X
                  G1 S1 Y240 F3000 ; coarse home Y
                  G1 X4 Y-4 F3000 ; back off from endstops
                  G1 S1 X-10 F300 ; fine home X
                  G1 S1 Y10 F300 ; fine home Y
                  G90 ; absolute positioning
                  G1 X120 Y120 F3000 ; center hotend
                  G30 ; Z probe home

                  That was it. Thank you. Now I have to figure out why this works on my first printer. Appreciate it.

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