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CoreXY - X-Axis Vibration Issues

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  • undefined
    Veti
    last edited by 12 Feb 2019, 10:50

    initialy i had the x rail fixiated but it cause loud vibrations on some moves.
    i removed the fixiation and now the x rail can move slightly back and forth and the vibrations are gone.
    see https://www.thingiverse.com/thing:2839395
    the rail is just prevented from sliding out completly by a screw

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    • undefined
      Syko_Symatic
      last edited by 12 Feb 2019, 11:27

      It's definitely something I can look at. I will have to model some sort of clamp for the rail. How does it stay "square" if it is allowed to move?

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      • undefined
        Veti
        last edited by 12 Feb 2019, 11:38

        its allowed to move in one direction to counteract slight alignment issues but it can not rotate.

        undefined 2 Replies Last reply 12 Feb 2019, 12:12 Reply Quote 0
        • undefined
          Syko_Symatic
          last edited by 12 Feb 2019, 11:39

          I think I understand, I am trying to look at your thingiverse link but the site is sooooo slow a the moment!

          undefined 1 Reply Last reply 13 Feb 2019, 10:59 Reply Quote 0
          • undefined
            Syko_Symatic @Veti
            last edited by 12 Feb 2019, 12:12

            @veti OK! So I have created a quick and dirty solution! I am going to print it in a few minutes and we will see if that solves the issue!

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            • undefined
              Syko_Symatic @Veti
              last edited by 12 Feb 2019, 13:48

              @veti So unfortunately it didn't help. My solution wasn't perfect by any means but it didn't change at all. Hmm... any other ideas? I know without the belts in ran perfectly, so it's obviously being pulled by the belts (as I understand is pretty normal with corexy).

              undefined 1 Reply Last reply 12 Feb 2019, 14:41 Reply Quote 0
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                deckingman @Syko_Symatic
                last edited by 12 Feb 2019, 14:41

                @syko_symatic Difficult to advise without a bit more information. All we know is that it's a CoreXY. Can you post some pictures -especially showing the belt arrangements. A bit better description of the problem would also help.

                Without having much to go on, I could make a shot in the dark and say that it might might be uneven belt tension that is imparting a twisting force which in turn is causing the guides to bind. The "classic" CoreXY belt patter usually shows the X carriage belts being quite a distance either side of the centre line of the X carriage. So if your belts are aligned like that, and the tension is uneven, then you might be getting a twisting force, which might be causing the guides to bind. I use stacked belts running along the centre line of the X carriage but you may not be able to do that easily.

                Ian
                https://somei3deas.wordpress.com/
                https://www.youtube.com/@deckingman

                undefined 1 Reply Last reply 12 Feb 2019, 15:13 Reply Quote 0
                • undefined
                  Veti
                  last edited by 12 Feb 2019, 15:09

                  also check that there is no twisting of the belts on direction change.
                  i.e make a gcode file with rapid 5mm movement back and forth at high speed and look at the belts during this.

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                  • undefined
                    Syko_Symatic @deckingman
                    last edited by Syko_Symatic 2 Dec 2019, 15:17 12 Feb 2019, 15:13

                    @deckingman Thanks, I will try and add some more info.
                    The belt arrangment is stacked and looks almost exactly like e3d's tool changer machine. I have included a short video from the other night. The noise isn't an issue in that video as it doesn't occur until it's moving a little faster.

                    Link

                    I have tried increasing and decreasing belt tension to no avail. Could it possibly be motor setting related?

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                    • undefined
                      Veti
                      last edited by 12 Feb 2019, 15:29

                      create a gcode that can replicate the noise.
                      Then while its making the noise try to narrow down the location.
                      the frame looks like it could be resonating at certain frequencies.

                      undefined 1 Reply Last reply 12 Feb 2019, 16:09 Reply Quote 0
                      • undefined
                        Syko_Symatic @Veti
                        last edited by 12 Feb 2019, 16:09

                        @veti It definitely sounds like it's coming from the x-axis carriage. I am going to give tuning the acceleration and max speed a go. Any suggestions of a good starting point?

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                        • undefined
                          mrehorstdmd
                          last edited by 12 Feb 2019, 16:59

                          Is the X axis linear guide a "preload" type? How is the X axis rail mounted so that it can slide? If it is free to move, it may be free to rattle, depending on how it's mounted.

                          https://drmrehorst.blogspot.com/

                          undefined 1 Reply Last reply 12 Feb 2019, 18:46 Reply Quote 0
                          • undefined
                            Veti
                            last edited by 12 Feb 2019, 17:20

                            how stable is the x carriage? Push the nozzle in different directions and see if there is play.
                            Also check the fans. I had some fans that created a rattle caused by the blades moving inside the fan at higher speeds. and banging on the casing

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                            • undefined
                              Syko_Symatic @mrehorstdmd
                              last edited by 12 Feb 2019, 18:46

                              @mrehorstdmd yes it’s preloaded. It is secured to a cross-brace by a few cap head screws.

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                              • undefined
                                fcwilt
                                last edited by 12 Feb 2019, 20:47

                                Hi,

                                It's hard to tell from the video but are the belts on either side of the X slide parallel to the slide?

                                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

                                undefined 1 Reply Last reply 12 Feb 2019, 21:56 Reply Quote 0
                                • undefined
                                  Syko_Symatic @fcwilt
                                  last edited by 12 Feb 2019, 21:56

                                  @fcwilt as best as I can get them. I’m going to try re-aligning everything again. Annoying, but I am going to wait for some new gates pulleys from E3D to make sure everything is the best it can be.

                                  Or maybe I will re-align it all first? I can’t decide. Either way I will keep trying.

                                  undefined 1 Reply Last reply 12 Feb 2019, 22:00 Reply Quote 0
                                  • undefined
                                    fcwilt @Syko_Symatic
                                    last edited by 12 Feb 2019, 22:00

                                    @syko_symatic

                                    Well I think it has to be something about your build.

                                    I built a D-Bot CoreXY printer and it has no binding issues at all. BUT it uses wheels-on-extrusion tech, not slides.

                                    My next CoreXY will try slides.

                                    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

                                    undefined 2 Replies Last reply 12 Feb 2019, 22:02 Reply Quote 0
                                    • undefined
                                      Syko_Symatic @fcwilt
                                      last edited by 12 Feb 2019, 22:02

                                      @fcwilt my thoughts exactly hence the slight rebuild. At least I can do it by only removing the top plate!

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                                      • undefined
                                        Gear @Syko_Symatic
                                        last edited by 13 Feb 2019, 10:59

                                        @syko_symatic just press f5 untill it loads ...

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                                        • undefined
                                          Syko_Symatic @fcwilt
                                          last edited by 14 Feb 2019, 09:30

                                          @fcwilt Having a think about it, the E3D design uses the fabtotum style corexy which places the belts in front and behind the x carriage. It is technically possible to move them both behind the carriage, would that help?

                                          undefined undefined 2 Replies Last reply 14 Feb 2019, 10:28 Reply Quote 0
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