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    CoreXY - X-Axis Vibration Issues

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    • Vetiundefined
      Veti
      last edited by

      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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      • Syko_Symaticundefined
        Syko_Symatic
        last edited by

        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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        • Vetiundefined
          Veti
          last edited by

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

          Syko_Symaticundefined 2 Replies Last reply Reply Quote 0
          • Syko_Symaticundefined
            Syko_Symatic
            last edited by

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

            Gearundefined 1 Reply Last reply Reply Quote 0
            • Syko_Symaticundefined
              Syko_Symatic @Veti
              last edited by

              @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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              • Syko_Symaticundefined
                Syko_Symatic @Veti
                last edited by

                @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).

                deckingmanundefined 1 Reply Last reply Reply Quote 0
                • deckingmanundefined
                  deckingman @Syko_Symatic
                  last edited by

                  @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

                  Syko_Symaticundefined 1 Reply Last reply Reply Quote 0
                  • Vetiundefined
                    Veti
                    last edited by

                    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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                    • Syko_Symaticundefined
                      Syko_Symatic @deckingman
                      last edited by Syko_Symatic

                      @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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                      • Vetiundefined
                        Veti
                        last edited by

                        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.

                        Syko_Symaticundefined 1 Reply Last reply Reply Quote 0
                        • Syko_Symaticundefined
                          Syko_Symatic @Veti
                          last edited by

                          @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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                          • mrehorstdmdundefined
                            mrehorstdmd
                            last edited by

                            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/

                            Syko_Symaticundefined 1 Reply Last reply Reply Quote 0
                            • Vetiundefined
                              Veti
                              last edited by

                              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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                              • Syko_Symaticundefined
                                Syko_Symatic @mrehorstdmd
                                last edited by

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

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                                • fcwiltundefined
                                  fcwilt
                                  last edited by

                                  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

                                  Syko_Symaticundefined 1 Reply Last reply Reply Quote 0
                                  • Syko_Symaticundefined
                                    Syko_Symatic @fcwilt
                                    last edited by

                                    @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.

                                    fcwiltundefined 1 Reply Last reply Reply Quote 0
                                    • fcwiltundefined
                                      fcwilt @Syko_Symatic
                                      last edited by

                                      @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

                                      Syko_Symaticundefined 2 Replies Last reply Reply Quote 0
                                      • Syko_Symaticundefined
                                        Syko_Symatic @fcwilt
                                        last edited by

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

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                                        • Gearundefined
                                          Gear @Syko_Symatic
                                          last edited by

                                          @syko_symatic just press f5 untill it loads ...

                                          1 Reply Last reply Reply Quote 0
                                          • Syko_Symaticundefined
                                            Syko_Symatic @fcwilt
                                            last edited by

                                            @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?

                                            deckingmanundefined fcwiltundefined 2 Replies Last reply Reply Quote 0
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