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Homing delta not working, possible configuration issue?

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  • undefined
    martinbogo
    last edited by 12 Jan 2018, 19:36

    I am configuring my new delta printer, a 1M tall, 500mm side three-tower. I have upgraded my Duet WiFi to 1.20, and my paneldue is still running 1.16. Right now I am just working out the kinematics of the machine, so I have not connected the fans, extruder motor, extruder heater, thermistor, bed heater, or the IR probe.

    Since I will be using an IR probe, I deleted the files related to deploying the probe as documented in 1.19's Changelog.

    When I press the "Home" button on the PanelDue, or send G28, the three delta carriages move up about 1-2mm, and then nothing else happens. Every G28/Home Press moves them up a little bit more, but the carriages do not act as they should. I am using Kysan bipolar 1.8 degree steppers @24V, 16 microsteps, 48T pulleys, and GT2 belts. My configured axis steps/mm is therefore 33.33 steps per mm. (200*16)/48/2

    As far as I can tell, the steppers are moving smoothly and quietly, in the correct direction… I'm just not seeing the right behavior.

    The configuration files in sys:

    My config.g is:

    [[language]]
    M550 PMartinDelta ; Machine name and Netbios name (can be anything you like)
    M551 Preprap ; Machine password (used for FTP)
    ;*** If you have more than one Duet on your network, they must all have different MAC addresses, so change the last digits
    M540 P0xBE:0xEF:0xDE:0xAD:0xa3:0x22 ; MAC Address
    ;*** Wifi Networking
    M552 S1 ; Enable WiFi
    M555 P2 ; Set output to look like Marlin
    M575 P1 B57600 S1 ; Comms parameters for PanelDue
    G21 ; Work in millimetres
    G90 ; Send absolute coordinates...
    M83 ; ...but relative extruder moves
    ; Axis and motor configuration
    M569 P0 S1 ; Drive 0 goes forwards
    M569 P1 S1 ; Drive 1 goes forwards
    M569 P2 S1 ; Drive 2 goes forwards
    M569 P3 S1 ; Drive 3 goes forwards
    M569 P4 S1 ; Drive 4 goes forwards
    M574 X2 Y2 Z2 S1 ; set endstop configuration (all endstops at high end, active high)
    ;*** The homed height is deliberately set too high in the following - you will adjust it during calibration
    M665 L256 R431.8 H500 B155 X0 Y0 ; set delta radius, diagonal rod length, printable radius and homed height
    M666 X0 Y0 Z0 ; put your endstop adjustments here, or let auto calibration find them
    M350 X16 Y16 E16 I1 ; Set 16x microstepping with interpolation
    M92 X33.33 Y33.33 Z33.33 ; Set axis steps/mm
    M906 X1200 Y1200 Z1200 E800 I60 ; Set motor currents (mA) and increase idle current to 60%
    M201 X1000 Y1000 Z1000 E1000 ; Accelerations (mm/s^2)
    M203 X20000 Y20000 Z20000 E3600 ; Maximum speeds (mm/min)
    M566 X1200 Y1200 Z1200 E1200 ; Maximum instant speed changes mm/minute
    ; Thermistors
    ; M305 P0 T100000 B3950 R4700 H30 L0 ; Put your own H and/or L values here to set the bed thermistor ADC correction
    ; M305 P1 T100000 B3974 R4700 H30 L0 ; Put your own H and/or L values here to set the first nozzle thermistor ADC correction
    ; M570 S180 ; Hot end may be a little slow to heat up so allow it 180 seconds
    ; Fans
    ; M106 P1 T50 H1 ; Fan 1 turns on at 50C, cools hotend
    ; M106 P2 H-1
    ; M106 P3 H-1
    ; Tool definitions
    ; M563 P0 D0 H1 ; Define tool 0
    ; G10 P0 S0 R0 ; Set tool 0 operating and standby temperatures
    ;*** If you have a single-nozzle build, comment the next 2 lines
    ;M563 P1 D1 H2 ; Define tool 1
    ;G10 P1 S0 R0 ; Set tool 1 operating and standby temperatures
    ; M92 E663:663 ; Set extruder steps per mm
    ; Z probe and compensation definition
    ;*** If you have a switch instead of an IR probe, change P1 to P4 in the following M558 command
    M558 P1 X0 Y0 Z0 ; Z probe is an IR probe and is not used for homing any axes
    G31 X0 Y0 Z4.80 P500 ; Set the zprobe height and threshold (put your own values here)
    ;*** If you are using axis compensation, put the figures in the following command
    M556 S78 X0 Y0 Z0 ; Axis compensation here
    M208 S1 Z-0.2 ; set minimum Z
    ;
    ;T0 ; select first hot end

    My homedelta.g is:

    [[language]]
    ; Homing file for RepRapFirmware on Mini Kossel
    G91 ; use relative positioning
    G1 S1 X500 Y500 Z500 F2500 ; move all carriages up 320mm, stopping at the endstops
    G1 S2 X-3 Y-3 Z-3 ; move all carriages down 3mm
    G1 S1 X6 Y6 Z6 F250 ; move carriages slowly up 6mm, stopping at the endstops
    G1 Z-5 F2000 ; down a few mm so that we can centre the head
    G90 ; back to absolute positioning
    G1 X0 Y0 F2000 ; centre the head and set a reasonable feed rate
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    • undefined
      martinbogo
      last edited by 12 Jan 2018, 20:49

      D'oh!

      Fiigured it out… two of the axes endstops were swapped ( Y/Z ) and didn't go to the corresponding motors., and because I was using Maker Mechanical 1.2 endstops, the logic was reversed ( S0 vs S1 )

      Now that is fixed, I still have one more mysterious issue. I can run G28 and the machine homes, BUT afterwards I can't get any G0/G1 moves to work, and there are no errors on the console of the paneldue.

      I go into relative mode, then try to instruct the machine to drop down 50mm :

      G91
      G1 Z-10 F2000

      Nada. No errors, just no movement.

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      • undefined
        martinbogo
        last edited by 12 Jan 2018, 21:54

        Follow-up

        I can do G92 X0 Y0 Z360 ( the actual height of my towers to the bed ) and it works
        I can do G91 and run the TOWERS.. i.e. ( G91 S1 X-50 Y-50 Z-50 F2500 ) and the towers move

        I just can't do G91, then G1 Z-10 F2000 for example … no movement, but also no errors

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        • undefined
          dc42 administrators
          last edited by 12 Jan 2018, 22:11

          There is an error in your M665 command. The combination of L and R you have specified is physically impossible. Your R (delta radius) parameter looks to me to be about double what it should be, perhaps more than double.

          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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          • undefined
            number40fan
            last edited by 13 Jan 2018, 00:16

            Increase the X, Y and Z in G1 S1 X500 Y500 Z500 F2500 in your homedelta to 800+ so you don't have to double tap home when you are stretched out on the build plate.

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