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    Strange salmon skin - Moire effect on my Delta

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    • totalitarianundefined
      totalitarian
      last edited by totalitarian

      Left is 0.4, right is 0.8 width. I had a brainwave and converted it from a flying extruder to a full bowden. Unfornately it didn't make a blind bit of notice 😞

      0_1558986458693_0fd9714d-6668-4630-9695-5362cacee565-image.png

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      • dc42undefined
        dc42 administrators
        last edited by

        What is the vertical spacing between the diagonal bands?

        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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        • totalitarianundefined
          totalitarian
          last edited by

          Bit tricky to tell but they look around 4mm

          0_1559045718146_2108427a-4333-452e-b9d0-02ca8a02a805-image.png

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          • dc42undefined
            dc42 administrators
            last edited by

            I was wondering whether it was related to the tooth pitch on the belts, which I presume is 2mm.

            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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            • totalitarianundefined
              totalitarian @dc42
              last edited by

              @dc42 If that was the case, would that indicate an issue with the belts or the toothed pulley?

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              • dc42undefined
                dc42 administrators @totalitarian
                last edited by

                @totalitarian said in Strange salmon skin - Moire effect on my Delta:

                @dc42 If that was the case, would that indicate an issue with the belts or the toothed pulley?

                Yes, or perhaps with the toothed side of the belts running over non-toothed idlers. But I would expect the vertical pitch of the banding to be 2mm, not 4mm

                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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                • totalitarianundefined
                  totalitarian
                  last edited by

                  Such a shame as otherwise it is a very well put together machine.

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                  • Vetiundefined
                    Veti
                    last edited by

                    @totalitarian said in Strange salmon skin - Moire effect on my Delta:

                    I would guess standard 1.5A

                    measure the resistance of a phase. that will give some indication as to what kind of motors they are.

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                    • bondusundefined
                      bondus
                      last edited by

                      It looks like typical delta waves on your printed parts. Bent diagonal patterns on flat surfaces. That's a sign that something is not perfect with the linear motion. It could be the pulleys, idler, linear bearings, ...
                      The bend in your patterns is not very sharp, the predator is a very large machine. A smaller machine will get sharper bends. If you move the model to the edge of the platform the angles should change, and the patterns will get tighter or more spread out depending on what/which towers is the cause.

                      When it is motor/driver related you usually get a tight, highly repetitive patterns. If you turn off microstepping it will show up very clearly. That's not a suggestion to solve your problem, but a fun experiment to see what it looks like 🙂

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                      • totalitarianundefined
                        totalitarian @bondus
                        last edited by

                        @bondus Thanks, i'll certainly give that a try. Do you not suspect the rods at all?

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                        • bondusundefined
                          bondus
                          last edited by

                          @totalitarian, I don't know how play in the arms looks like in prints. But I suspect it would not leave nice patterns. Who knows, deltas are complex machines.

                          It's easy to check for play of the ball joints, just wiggle the arms, any click-clock sounds are bad. Rumour says that if you have play in those small joints you can gently squeeze them on the edge in a vice or with some pliers to increase the preload.

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