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    An odd behaviour with delta endstops and how I solved it.

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    • DjDemonD
      DjDemonD last edited by

      So I've had this twice and both times do not know why it happens.

      Homing a delta, for some reason the homing does not work as normal after homing the coordinates are not x0,y0,z445. This then throws everything out, I normally notice as one of the carriages will crash the endstop, or the autocalibration is miles off, or some points are outside of the bed.

      As a way of avoiding the endstop crash I set my homedelta.g file to move down 40mm before going to x0,y0 which gives the carriages some headroom, if they end up going to some other random coordinates instead.

      What solves it is deleting my config_override.g file.

      Its an odd one for sure, as nothing else has changed and its back to to normal after deleting the override which contains nothing about homing.
      Running FW 1.18.1 now but it happened before when I was on 1.17.

      Simon. Precision Piezo Z-Probe Technology
      www.precisionpiezo.co.uk
      PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

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      • dc42
        dc42 administrators last edited by

        The usual cause of deltas failing to home correctly is that the XYZ parameters in the first G1 S1 command in config.g are smaller than the maximum carriage travel. So the printer will home correctly from some head positions but not from others.

        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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        • DjDemonD
          DjDemonD last edited by

          Yeah I used to have this when using the default 350mm, from the kossel mini example config, but I now have 700mm in there, my rails are 800mm long. I used to home, then home again. This is different, next time it happens which could be a while, I'll try to grab some more information.

          Simon. Precision Piezo Z-Probe Technology
          www.precisionpiezo.co.uk
          PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

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          • dc42
            dc42 administrators last edited by

            Are you certain that 700mm is far enough, when the nozzle is touching the very edge of the bed, opposite a tower?

            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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            • DjDemonD
              DjDemonD last edited by

              I'll increase it to 1000mm that will cover it. Thanks.

              Simon. Precision Piezo Z-Probe Technology
              www.precisionpiezo.co.uk
              PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

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