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    Do it exist any way change the sync between axis?

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    stepper lag axis sync axis timing axis lag timing
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    • Axel-Hundefined
      Axel-H
      last edited by

      I have run into a interesting problem where the Y axis change direction a fraction of a second later than the X axis creating ovals that have its long axis instead of being at 0° and 180°(or 90° and 270°) the long axis are on 110° and 290°, Y also have a flat area from 90 and 270 toward 110° and 290° but not before 90 and 270.

      I hope that description makes sense. In reality the issue is because of friction in Y byt if any way to change the timing between Y and X exist I would be interested to know about it as I suspect knowing about something like that will be useful sooner or later and might solve this problem until I have the ability to rebuild the Y transfer.
      The machine is a Cartesian and the X band is direct drive but the 2 Y bands are connected to a shared axis that is driven by motor connected to it by a band.

      I have locked into the m596 and M670 but can't make heads or tails of if any of those commands could do that.

      I run a duet wifi on this machine but I also have a duet 3 in an other machine.

      dc42undefined 1 Reply Last reply Reply Quote 0
      • dc42undefined
        dc42 administrators @Axel-H
        last edited by

        @axel-h the usual cause of that type of problem is backlash in one of the axes. Common causes are a loose belt or a loose pulley.

        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

        Axel-Hundefined 1 Reply Last reply Reply Quote 0
        • Axel-Hundefined
          Axel-H @dc42
          last edited by

          @dc42
          yeah.
          That was the first I checked, all the pulleys are well attached and all belts are tight.

          I suspect the problem is in the end that the Gates power grip gt belts stretches just a little bit when changing directions.
          As the weight in the Y carriage is substantial and I likely have too much friction in it that I need to remove by rebuilding the gantry.
          The problem is that I won't have time to do that rebuild for a while so I was looking if any solution exist that I can use in the meantime

          dc42undefined 1 Reply Last reply Reply Quote 0
          • dc42undefined
            dc42 administrators @Axel-H
            last edited by dc42

            @axel-h said in Do it exist any way change the sync between axis?:

            I suspect the problem is in the end that the Gates power grip gt belts stretches just a little bit when changing directions.

            I would be surprised f they stretch enough to cause a visible effect. If they did, I would expect many more users to report this.

            Does increasing the motor current help, if you are not already close to the motor or driver current limits?

            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

            Axel-Hundefined 1 Reply Last reply Reply Quote 0
            • Axel-Hundefined
              Axel-H @dc42
              last edited by

              @dc42
              The drivers are set to 1500mA (12v) and while the drivers could take more I am not comfortable running the motor at much more.

              I suspect the real cause of the problem is the 8mm Y transfer axel instead of the 5mm that is usually used and the Iglidur G bearings don't like the kind of transverse load that the bands put it under.
              I hope to be able to replace the Iglidur with roller bearings soon as that will likely solve the problem for real.

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