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    Set up three Z-axis location - M671

    Duet Hardware and wiring
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    • bernie-mix
      bernie-mix last edited by

      Hey guys,

      Set up three Z-axis location - M671- in RRF3 on Duet 3 MB6HC:

      Which coordinates should I enter? The real ones of the leadscrews (A) or the ones where the bed actually rests (B)?

      3axis.JPG

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      • fcwilt
        fcwilt last edited by

        In theory the B locations are the best.

        But during testing I have tried both A and B locations with equivalent results.

        Frederick

        Printers: A FT-5 with the 713 upgrade bits. A custom MarkForged style. A small Utilmaker style and a CoreXY from kits. Various hotends. Using Duets (2 and 3) running 3.4.1

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        • Phaedrux
          Phaedrux Moderator last edited by

          If it's a properly designed kinematic mount where the center of rotation is at the contact point between the mount and bed, use B. If it's a more rigid bed mount use A because the point of rotation is likely going to be closer to the point of force.

          Z-Bot CoreXY Build | Thingiverse Profile

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          • bernie-mix
            bernie-mix last edited by

            Yes, it is a kinematic mount with ball screws. According to my logic, I wanted to use the "B" position too. Many thanks for your help

            fcwilt 1 Reply Last reply Reply Quote 2
            • fcwilt
              fcwilt @bernie-mix last edited by

              @bernie-mix said in Set up three Z-axis location - M671:

              Yes, it is a kinematic mount with ball screws. According to my logic, I wanted to use the "B" position too. Many thanks for your help

              What rests on the balls?

              On my printer the left and right are v-groves and the rear is a simple spherical recess.

              Thanks.

              Frederick

              Printers: A FT-5 with the 713 upgrade bits. A custom MarkForged style. A small Utilmaker style and a CoreXY from kits. Various hotends. Using Duets (2 and 3) running 3.4.1

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              • bernie-mix
                bernie-mix last edited by

                At the rear is a magnetic spherical recess, front right is magnetic v-groves (45° to X and Y axis) and front left a a plane round magnet

                fcwilt 1 Reply Last reply Reply Quote 1
                • fcwilt
                  fcwilt @bernie-mix last edited by

                  @bernie-mix said in Set up three Z-axis location - M671:

                  At the rear is a magnetic spherical recess, front right is magnetic v-groves (45° to X and Y axis) and front left a a plane round magnet

                  How did you chose that arrangement? I found that the two front points could use the same approach.

                  Thanks.

                  Printers: A FT-5 with the 713 upgrade bits. A custom MarkForged style. A small Utilmaker style and a CoreXY from kits. Various hotends. Using Duets (2 and 3) running 3.4.1

                  bernie-mix 1 Reply Last reply Reply Quote 0
                  • bernie-mix
                    bernie-mix @fcwilt last edited by bernie-mix

                    @fcwilt
                    In my opinion, this is the only way the bed can expand in all directions without rotating around the spherical recess

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                    • fcwilt
                      fcwilt @bernie-mix last edited by

                      @bernie-mix said in Set up three Z-axis location - M671:

                      @fcwilt
                      In my opinion, this is the only way the bed can expand in all directions without rotating around the spherical recess

                      Ah... So the balls are lifting the heated bed itself? If so I can understand your arrangement.

                      Thanks.

                      Frederick

                      Printers: A FT-5 with the 713 upgrade bits. A custom MarkForged style. A small Utilmaker style and a CoreXY from kits. Various hotends. Using Duets (2 and 3) running 3.4.1

                      1 Reply Last reply Reply Quote 0
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