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    # Y axis moves, when only X is commanded

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    Tuning and tweaking
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    • FxxTooundefined
      FxxToo @dc42
      last edited by

      @dc42 Thanks for your reply. I just tried swapping the test and If I move the Y first, the X moves, just like the Y did. So that means you are right. Now I am not sure how to proceed.

      When I was putting it together I used a 12" caliper and a extension rod that I filed to 6" to use to extend the only way I had of accurately measuring the distances. I measured distances between the X at the ends of the rails and the same on the Y. I believe that I am at .001" or less end to end. The belt that changes length on the outsides in the Y axis look very straight and measure the same width and the ends just before they change direction. (as accurately as I can). Used

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      • FxxTooundefined
        FxxToo @MSquared
        last edited by

        @msquared Thanks, I will check that out. Both motors sound good and when measuring the distance and repeating positions, it seems good.

        MSquaredundefined 1 Reply Last reply Reply Quote 0
        • MSquaredundefined
          MSquared @FxxToo
          last edited by

          @fxxtoo Mine did not sound good, at all...in retrospect.

          maybe some pictures of your belts / routing would help

          FxxTooundefined 2 Replies Last reply Reply Quote 0
          • FxxTooundefined
            FxxToo @MSquared
            last edited by

            @msquared I will try tonight to take some pics and post them..Thanks

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            • FxxTooundefined
              FxxToo @MSquared
              last edited by

              @msquared Here is some pictures, I hope they help get to the bottom of this...
              All comments are welcome...

              0_1523927919988_DSC_0043-mod.JPG

              0_1523928059708_DSC_0056-mod.JPG

              0_1523928186784_DSC_0057-mod.JPG

              0_1523928301916_DSC_0051-mod.JPG

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              • whosrdaddyundefined
                whosrdaddy
                last edited by whosrdaddy

                maybe the photos are misleading but it seems that the belts coming from the motors are not aligned with the Y axis rails.

                FxxTooundefined 1 Reply Last reply Reply Quote 0
                • dc42undefined
                  dc42 administrators
                  last edited by

                  There is a good diagram that shows which belts must be parallel here http://forums.reprap.org/read.php?397,818906,818924#msg-818924.

                  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

                  FxxTooundefined 1 Reply Last reply Reply Quote 0
                  • FxxTooundefined
                    FxxToo @dc42
                    last edited by

                    @dc42 Thanks. I modeled this printer after the last one the Digital Dentist built. I laid a straight edge on the belt and the motor side is out about .6 millimeter. I haven't checked the other side yet. I hope that will fix this. I love the Duet and the 7" Panel. I am glad that I went with this system.

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                    • FxxTooundefined
                      FxxToo @whosrdaddy
                      last edited by

                      @whosrdaddy Thanks, It is off a bit on the motor side.

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                      • FxxTooundefined
                        FxxToo
                        last edited by

                        I had to set this aside because of work, but am back at this. I found a post where a guy was having the same issues as I was. https://forum.duet3d.com/topic/3688/corexy-setup-problems-with-movement
                        I tried what he did and changed the steps per mm on one axis and my problem went away. That was after taking every thing a part and redoing it. The rails on the bearings are parallel within .001" end to end. The X is 90 degrees to the Y, the belts are even and the movements are correct. So I changed M92 X320 Y320 , trying different setting and with M92 X320 Y319, the movement of the axis are correct, no more Y movement when moving just the X and vice versa. So barring a difference in a pulley, could the board have a timing issue like the guy in the link posted as DC42 stated? Help I am just trying to get this printer up and running

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