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CoreXY - X-Axis Vibration Issues

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  • undefined
    zapta @Veti
    last edited by 1 Apr 2019, 16:39

    @veti said in CoreXY - X-Axis Vibration Issues:

    Same for me. But can anyone give an explanation as to why this solves the problem?
    My current theory is that the microstepping can not hold the inbetween steps in all cases.

    I think that my experiment of having vibration in a single stepper diagonal move (I as actually holding the other belt with my finger to make sure that there are no vibrations from the stationary motor) supports that this is not necessarily a result of an interaction between the two motors.

    Your explanation sounds reasonable to me. Microstepping and Interpolation have their limits, especially that it is a modulation of the underlying PWM and not direct linear current source.

    Another potential factor is that the 0.9 steppers are also larger (for same torque) and thus have higher mass and smoother rotation (?)

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    • undefined
      Veti
      last edited by Veti 4 Jan 2019, 18:19 1 Apr 2019, 18:18

      i found this very good analysis of microstepping https://hackaday.com/2016/08/29/how-accurate-is-microstepping-really/

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        dc42 administrators @zapta
        last edited by 2 Apr 2019, 10:21

        @zapta said in CoreXY - X-Axis Vibration Issues:

        Connected the 12A/24V bed to the Duet directly and everything works like champ. Not sure if I want to install a new SSR. I like the current simplicity.

        12A is well within the rating of the Duet. I recommend that at regular intervals you check that the screws in the VIN and bed heater terminal blocks of the Duet are still tight, until you are sure that they are staying tight. This is because high currents can cause creep in wires. Crimping the correct ferrules on to the wire ends reduces this risk.

        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 2 Apr 2019, 17:21 Reply Quote 0
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          fcwilt @zapta
          last edited by 2 Apr 2019, 12:51

          @zapta said in CoreXY - X-Axis Vibration Issues:

          Connected the 12A/24V bed to the Duet directly and everything works like champ. Not sure if I want to install a new SSR. I like the current simplicity.

          My heaters are all line voltage heaters (110 VAC) and thus an SSR is needed.

          Frederick

          Printers: a small Utilmaker style, a small CoreXY and a E3D MS/TC setup. Various hotends. Using Duet 3 hardware running 3.4.6

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          • undefined
            zapta @dc42
            last edited by 2 Apr 2019, 17:21

            @dc42 said in CoreXY - X-Axis Vibration Issues:

            12A is well within the rating of the Duet.

            Yes, it seems to handle it very well and the mosfet is cool even at 100% PWM (looked at it with an IR camera).

            I did crimp cheap Chinese ferrules, hope they are right, they seem to be made of aluminum(?). Not sure how it will behave when oxidized. I know very little about it

            undefined 1 Reply Last reply 2 Apr 2019, 18:20 Reply Quote 0
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              dc42 administrators @zapta
              last edited by 2 Apr 2019, 18:20

              @zapta said in CoreXY - X-Axis Vibration Issues:

              Yes, it seems to handle it very well and the mosfet is cool even at 100% PWM (looked at it with an IR camera).

              The rated bed heater current of the Duet isn't set by the MOSFET, it's determined by heating of the PCB traces. Even when using 2oz copper instead of the usual 1oz, and duplicating traces on both sides of the PCB, it's hard to carry 20A on a PCB.

              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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                zapta
                last edited by 2 Apr 2019, 20:04

                @dc42, I presume you are aware of this technique but just in case

                http://www.eevblog.com/forum/blog/eevblog-317-pcb-tinning-myth-busting/

                undefined 1 Reply Last reply 6 Apr 2019, 19:52 Reply Quote 0
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                  Veti
                  last edited by 6 Apr 2019, 16:45

                  we have a name. VFA (Vertical Fine Artifacts)

                  https://shop.prusa3d.com/forum/user-mods-octoprint-enclosures-nozzles--f65/stepper-motor-upgrades-to-eliminate-vfa-s-vertical-t28098.html

                  it seems if you make your printer more precise these artefacts start to show.

                  after getting an ender 3 to play with i found these artefacts as well on the ender 3.
                  funny thing is the user started seeing the problem around the same time.

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                  • undefined
                    dc42 administrators @zapta
                    last edited by 6 Apr 2019, 19:52

                    @zapta said in CoreXY - X-Axis Vibration Issues:

                    @dc42, I presume you are aware of this technique but just in case

                    http://www.eevblog.com/forum/blog/eevblog-317-pcb-tinning-myth-busting/

                    Yes, but it's not very effective, especially if you are already using 2oz copper.

                    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 Apr 2019, 20:59 Reply Quote 0
                    • undefined
                      zapta @dc42
                      last edited by 6 Apr 2019, 20:59

                      @dc42, yes, this is a good point. Doubling the copper thickness doesn't double the solder.

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