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Delta -- Layer Shift Upward and Towards the Y tower

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  • undefined
    wepollock
    last edited by wepollock 2 Apr 2019, 14:40 4 Feb 2019, 14:36

    My mistake.. I should have saved the log (my mistake in not doing so) but I did not see any exceptions.

    To do list?
    (today or tomorrow)
    -I will open up the case and look for mechanical issues on that axis.
    -I am also going to re-crimp the Y stepper.

    As a third step;
    -Can you swap around the Y stepper driver to the spare extruder driver?

    1 Reply Last reply Reply Quote 0
    • undefined
      dc42 administrators
      last edited by 4 Feb 2019, 14:58

      Have you checked that the pulley grub screw is tight on the motor shaft, and the belt tension is correct?

      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

      undefined 1 Reply Last reply 4 Feb 2019, 16:39 Reply Quote 0
      • undefined
        wepollock @dc42
        last edited by 4 Feb 2019, 16:39

        @dc42

        Thanks Dave..

        I am going to open up the printer and check the mechanical stuff out first.

        undefined 1 Reply Last reply 4 Feb 2019, 16:53 Reply Quote 0
        • undefined
          wepollock @wepollock
          last edited by wepollock 2 Apr 2019, 19:18 4 Feb 2019, 16:53

          FOUND THE PROBLEM..

          The whole motor mount has unseated itself from the extrusion.
          Four screws are loose, two hidden behind the power supply.

          Dave do you know where I could source a 500mm diameter delta bed? I have a laser cut wood mockup presently.
          I am going to use the Duet Smart Effector.

          Bolts on Motor Mount Loose

          undefined 1 Reply Last reply 6 Feb 2019, 07:03 Reply Quote 0
          • undefined
            dc42 administrators
            last edited by 4 Feb 2019, 20:36

            If I was building a delta now, I would probably try to source a piece of cast aluminium tooling plate and have it cut to a hexagonal shape. I've just asked Aluminium Warehouse if they can do that.

            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

            undefined 1 Reply Last reply 6 Feb 2019, 02:06 Reply Quote 0
            • undefined
              wepollock @dc42
              last edited by wepollock 2 Jun 2019, 02:43 6 Feb 2019, 02:06

              @dc42

              Dave.

              That would be great if you could hook me up. I think I am going to have a rigid printer using 3d printed parts. I have one arm built and I am going to anchor it down to 3/4 inch 600mm plywood circle I am having cut.

              What got me going was the price tag on "The Boss" $4000-$5000 not happening. *I had to take the Artemis apart today, it was very hard to service. Some of the Seemecnc design points are brilliant, my choices would be different here or there. The Rostock max is more serviceable. *

              I was thinking of having wood laser cut to accommodate the extrusion but I decided to print strong but huge parts. I am clamping into the plastic using a 40x40mm aluminum clamp with 4 bolts connected to the 4040 extrusions. The arms are 60x120mm I-beams that print without support. Then the motor mounts also tie into the extrusion. I will anchor arms into the plywood base.

              My thinking was that everything would still be of use if I wanted to replace the 3d printed parts with aluminum. In my testing there is near zero deflection.

              Here is one arm
              590mm carbon fiber arms, with ball cups
              Effector base for Duet Leveling
              Extrusions are clamped on four points

              alt text
              alt text
              alt text
              alt text

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              • undefined
                Wyvern @wepollock
                last edited by 6 Feb 2019, 07:03

                @wepollock
                If you live in the states, Midwest metals has ATP-5 that they can cut circular- possibly other shapes too.

                Wasn't bad for a 1/4 13X13, like $50 shipped.

                undefined 1 Reply Last reply 6 Feb 2019, 20:48 Reply Quote 0
                • undefined
                  wepollock @Wyvern
                  last edited by 6 Feb 2019, 20:48

                  @wyvern Thanks for the tip.

                  I am going to give the 3d print and plywood a try.

                  Here is a cross section of an arm. The shell is 3 layers at .70 mm each
                  I paid attention as to how I would place my infill on each part.

                  It's almost uncrushable.

                  alt text

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                  • undefined
                    wepollock
                    last edited by 6 Feb 2019, 22:48

                    Looking at the Seemecnc machine it's actually a small plate that is holding the extrusions in place.
                    So I don't know how the movement is telegraphed through the structure.

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                    • undefined
                      wepollock
                      last edited by wepollock 2 Aug 2019, 16:56 8 Feb 2019, 12:53

                      For two aluminum 1/4 inch plates, I am getting a $450 price quote.
                      The tolerances quoted are not great.
                      As you can see I have staggered holes to accommodate different geometries.

                      The real kicker is that if you go up to 25 parts the price goes down from $200 each to $80-$100 each.
                      It would be great if this could be cost-shared in some way.

                      alt text

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