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    Weird problem with magnetic arms and tool fan

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    My Duet controlled machine
    delta effector fan speed magnet
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    • skayredundefined
      skayred
      last edited by

      Hello, I have a Delta printer with magnetic arms.

      Some time ago, i started having a weird problem - when I move effector in X-Y plane, fan RPM varies depending on the position - for example, in 0/+40 it nearly stop, while in the center it has about the normal RPM and works pretty loud. I have replaced the fan with the new and quiet one, after some time I have the same problem again. When I unscrewed the fan, I have found out, that the fan behaves so when it is located close to magnets, it seems that magnetic field makes the bearing loose, until the friction goes to high - that explains the noise.

      My effector looks so:
      IMG_20220120_203642.jpg

      Did someone have the same problem? Is there any workaround without changing the effector design?

      alankilianundefined jay_s_ukundefined 2 Replies Last reply Reply Quote 0
      • alankilianundefined
        alankilian @skayred
        last edited by

        @skayred

        You could try shielding but it might be expensive:
        https://www.youtube.com/watch?v=oxg_hCvXSrw

        Or you could try rotating the fan into different orientations and see if it's less sensitive in some orientations.

        SeemeCNC Rostock Max V3 converted to V3.2 with a Duet2 Ethernet Firmware 3.2 and SE300

        skayredundefined 1 Reply Last reply Reply Quote 0
        • jay_s_ukundefined
          jay_s_uk @skayred
          last edited by

          @skayred make sure you alternate the arms. There should be one with a north magnet, then South then north and so on.
          If you have Haydn rods, he puts a stick at the end with a north magnet so just alternate where the sticker end is

          Owns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF. Assume I'm running whatever the latest beta/stable build is

          skayredundefined 1 Reply Last reply Reply Quote 0
          • skayredundefined
            skayred @alankilian
            last edited by

            @alankilian hello, did i understand correctly, that i should try rotate the fan let's say 90 degrees counterclockwise keeping the effector position?

            I was also wondering, should I give a try to the remote fan (connected with PVC hose), would that be sufficient for the hotend cooling? My effector is pretty small, so there are no other places where I can mount the fan

            alankilianundefined 1 Reply Last reply Reply Quote 0
            • skayredundefined
              skayred @jay_s_uk
              last edited by

              @jay_s_uk yeah, I have Haydn's arms, so the result position should be like S-n-s-n-s-n around?

              jay_s_ukundefined 1 Reply Last reply Reply Quote 0
              • alankilianundefined
                alankilian @skayred
                last edited by

                @skayred said in Weird problem with magnetic arms and tool fan:

                try rotate the fan let's say 90 degrees counterclockwise

                Yes that's what I mean, but I think @jay_s_uk also has a good suggestion.

                SeemeCNC Rostock Max V3 converted to V3.2 with a Duet2 Ethernet Firmware 3.2 and SE300

                1 Reply Last reply Reply Quote 0
                • jay_s_ukundefined
                  jay_s_uk @skayred
                  last edited by

                  @skayred yes. It's a known thing with magball arms. If you have them all the same way the magnetic field affects the hotend fan

                  Owns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF. Assume I'm running whatever the latest beta/stable build is

                  skayredundefined 1 Reply Last reply Reply Quote 1
                  • skayredundefined
                    skayred @jay_s_uk
                    last edited by

                    @jay_s_uk @alankilian I have done both - it worked, thanks! Life is a magic if I don't know physics well enough 😄

                    alankilianundefined 1 Reply Last reply Reply Quote 2
                    • alankilianundefined
                      alankilian @skayred
                      last edited by

                      @skayred

                      GREAT news.

                      Send some images of good prints when you're done.
                      It's always nice to see success.

                      SeemeCNC Rostock Max V3 converted to V3.2 with a Duet2 Ethernet Firmware 3.2 and SE300

                      1 Reply Last reply Reply Quote 0
                      • skayredundefined
                        skayred
                        last edited by

                        It actually started working way better with PLA as a side effect

                        IMG_20220122_190044__01.jpg

                        1 Reply Last reply Reply Quote 0
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