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Can't disable negative Z coordinates

Scheduled Pinned Locked Moved
Using Duet Controllers
coordinate system tool tool change m208
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  • undefined
    e4d
    last edited by 15 Mar 2022, 11:11

    Hello,

    I have a security issue with my E3D ToolChanger using Duet. I set the Z axis minima to be 0 :

    M208 X-35:328.5 Y-49:243 Z0:278 C-45:360 ; Set axis maxima & minima

    However I can go in negative coordinates when a tool is active. My understanding of the problem is that M208 limit the "machine position" and not the "tool position". I there a way to apply the M208 command to the tool position ?

    I also have a strange behaviour that might be a bug ? If I go in Z-0.1 (tool position) while a tool is selected and I dock the tool, the machine will go back at Z-0.1 (now machine position) and crash in the bed. Can I disable the fact that the Z move to the previous position after docking a tool ? Thanks

    undefined 1 Reply Last reply 15 Mar 2022, 11:15 Reply Quote 0
    • undefined
      dc42 administrators @e4d
      last edited by 15 Mar 2022, 11:15

      @e4d said in Can't disable negative Z coordinates:

      However I can go in negative coordinates when a tool is active. My understanding of the problem is that M208 limit the "machine position" and not the "tool position". I there a way to apply the M208 command to the tool position ?

      You can change the limits in your tpost#.g files to suit the tool that you have just loaded. Don't forget to reset them in the tfree#.g files.

      I also have a strange behaviour that might be a bug ? If I go in Z-0.1 (tool position) while a tool is selected and I dock the tool, the machine will go back at Z-0.1 (now machine position) and crash in the bed. Can I disable the fact that the Z move to the previous position after docking a tool ?

      Recent firmware versions do not restore the old Z after changing tool. Which firmware version are you using?

      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
      • undefined
        e4d
        last edited by 15 Mar 2022, 11:20

        @dc42 I frequently change nozzle or work on my tools, that mean I need to update the tool offset and the tool macro everytime ? I think it would be way more practical is there was a way for the Duet to use the tool position as limit when a tool is selected.

        I have a Duet3 6CH with RRF3.3, here's my M122 :

        M122
        === Diagnostics ===
        RepRapFirmware for Duet 3 MB6HC version 3.3 (2021-06-15 21:45:47) running on Duet 3 MB6HC v1.01 or later (standalone mode)
        Board ID: 08DJM-956BA-NA3TJ-6J1DJ-3S46S-198YT
        Used output buffers: 3 of 40 (26 max)
        === RTOS ===
        Static ram: 150904
        Dynamic ram: 93648 of which 200 recycled
        Never used RAM 106584, free system stack 152 words
        Tasks: NETWORK(ready,29.2%,224) ETHERNET(notifyWait,0.3%,117) HEAT(notifyWait,0.0%,325) Move(notifyWait,0.0%,250) CanReceiv(notifyWait,0.0%,944) CanSender(notifyWait,0.0%,362) CanClock(delaying,0.0%,333) TMC(notifyWait,7.8%,59) MAIN(running,62.6%,944) IDLE(ready,0.0%,29), total 100.0%
        Owned mutexes:
        === Platform ===
        Last reset 00:51:27 ago, cause: power up
        Last software reset details not available
        Error status: 0x00
        Step timer max interval 584
        MCU temperature: min 11.1, current 29.1, max 29.6
        Supply voltage: min 23.9, current 24.0, max 24.1, under voltage events: 0, over voltage events: 0, power good: yes
        12V rail voltage: min 12.1, current 12.2, max 12.2, under voltage events: 0
        Heap OK, handles allocated/used 99/0, heap memory allocated/used/recyclable 2048/12/12, gc cycles 0
        Driver 0: position 36450, standstill, reads 61776, writes 14 timeouts 0, SG min/max 0/0
        Driver 1: position 6450, standstill, reads 61747, writes 43 timeouts 0, SG min/max 0/65
        Driver 2: position 120000, standstill, reads 61776, writes 14 timeouts 0, SG min/max 0/0
        Driver 3: position 21481, standstill, reads 61738, writes 52 timeouts 0, SG min/max 0/1023
        Driver 4: position 0, standstill, reads 61738, writes 52 timeouts 0, SG min/max 0/1023
        Driver 5: position 0, standstill, reads 61735, writes 55 timeouts 0, SG min/max 0/204
        Date/time: 2022-03-15 12:17:01
        Slowest loop: 84.70ms; fastest: 0.05ms
        === Storage ===
        Free file entries: 10
        SD card 0 detected, interface speed: 25.0MBytes/sec
        SD card longest read time 3.3ms, write time 4.3ms, max retries 0
        === Move ===
        DMs created 125, maxWait 524449ms, bed compensation in use: none, comp offset 0.000
        === MainDDARing ===
        Scheduled moves 2872, completed moves 2872, hiccups 0, stepErrors 0, LaErrors 0, Underruns [0, 0, 74], CDDA state -1
        === AuxDDARing ===
        Scheduled moves 0, completed moves 0, hiccups 0, stepErrors 0, LaErrors 0, Underruns [0, 0, 0], CDDA state -1
        === Heat ===
        Bed heaters = 0 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1, chamberHeaters = 3 -1 -1 -1
        === GCodes ===
        Segments left: 0
        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
        USB is idle in state(s) 0
        Aux is idle in state(s) 0
        Trigger is idle in state(s) 0
        Queue is idle in state(s) 0
        LCD is idle in state(s) 0
        SBC is idle in state(s) 0
        Daemon is idle in state(s) 0
        Aux2 is idle in state(s) 0
        Autopause is idle in state(s) 0
        Code queue is empty.
        === CAN ===
        Messages queued 27798, received 0, lost 0, longest wait 0ms for reply type 0, peak Tx sync delay 0, free buffers 49 (min 49), ts 15439/0/0
        Tx timeouts 0,9,15438,0,0,12348 last cancelled message type 30 dest 127
        === Network ===
        Slowest loop: 104.18ms; fastest: 0.02ms
        Responder states: HTTP(0) HTTP(0) HTTP(0) HTTP(0) HTTP(0) HTTP(0) FTP(0) Telnet(0), 0 sessions Telnet(0), 0 sessions
        HTTP sessions: 3 of 8
        - Ethernet -
        State: active
        Error counts: 0 0 1 0 0
        Socket states: 5 2 2 2 2 0 0 0
        undefined 1 Reply Last reply 15 Mar 2022, 11:30 Reply Quote 0
        • undefined
          dc42 administrators @e4d
          last edited by 15 Mar 2022, 11:30

          @e4d you can use GCode expressions to pick up tool offsets and use it to calculate the new limits in the M208 command.

          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
          • undefined
            e4d
            last edited by 15 Mar 2022, 13:44

            I successfuly manage to set the limit with this command in the tpre2.g :

            ;Adjust Z axis limits to tool offset
            M208 Z{-tools[2].offsets[2]}:{move.axes[2].max}

            @dc42 thank you for your help on the previous point ! You said that in recent firmware the machine should not restore the old Z, mine does, is it a configuration somewhere ?

            undefined 1 Reply Last reply 15 Mar 2022, 15:42 Reply Quote 0
            • undefined
              dc42 administrators @e4d
              last edited by 15 Mar 2022, 15:42

              @e4d if you upgrade to 3.4RC2 then it should not restore the position.

              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
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