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    Using a 4th (Rotary) Axis

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    • dc42undefined
      dc42 administrators @littlehobbyshop
      last edited by

      @littlehobbyshop said in Using a 4th (Rotary) Axis:

      I'll have to be cautious with absolute and incremental movements in that case. Without a direction parameter there are always 2 ways to get to a position.

      This is true. The firmware has the means to handle rotary axes differently (it's used on polar and some SCARA machines), but currently there is no command to declare that an axis is rotary.

      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

      ScaraManundefined 1 Reply Last reply Reply Quote 0
      • 3DPMicroundefined
        3DPMicro @littlehobbyshop
        last edited by 3DPMicro

        @littlehobbyshop please pass along your experience going forward. I occasionally add a 4th axis (currently just for indexing) to my Duet controlled micro mill. https://forum.duet3d.com/topic/11581/duet-controlled-micro-mill My CAM outputs 4th axis though I have yet to dedicate the time to explore simultaneous work. My current focus is an ATC for the machine but plan to start working again on the the "A" axis soon after that is complete

        Duet controlled Jet Lathe, scratch built micro mill and 3d printer. 1992 Haas VF2 VMC retrofit

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        • ScaraManundefined
          ScaraMan @dc42
          last edited by

          @dc42 Hi David, I am trying to get in contact with you concerning SCARA.
          I have posted a link on the forum , can you please have a look at it, I need your opinion.
          Thank you

          here is the link
          https://forum.duet3d.com/topic/14114/scara-robot-want-to-know-if-duet-wifi-is-the-right-choice?_=1580465871679

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          • Danalundefined
            Danal
            last edited by

            I know you want an answer from dave... but... as @Phaedrux said in the other tread, Duet WiFi will definitely drive the scara geometry you show.

            Here is how to configure it:

            https://duet3d.dozuki.com/Wiki/ConfiguringRepRapFirmwareSCARAPrinter

            Delta / Kossel printer fanatic

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            • tntjetundefined
              tntjet
              last edited by tntjet

              I’m kinda at a loss it may be old age or ignorance , how would one define the U axis (Rotary) to degrees instead of mm on a Cartesian CNC for M92 201 203 etc . Preferably to be a free axis with no limit switch .

              A Former User? 1 Reply Last reply Reply Quote 1
              • A Former User?
                A Former User @tntjet
                last edited by

                @tntjet said in Using a 4th (Rotary) Axis:

                , how would one define the U axis (Rotary) to degrees instead of mm on a

                you sort of don't; i.e. the axis doesn't actually know about units - so just set the steps/mm to whatever steps you need to turn to move 1 degree instead of 1mm.

                1 Reply Last reply Reply Quote 1
                • tntjetundefined
                  tntjet
                  last edited by

                  Ok I see, that’s what I was missing , my axis has 600 steps per 360. 1.6666 per degree ?

                  A Former User? 1 Reply Last reply Reply Quote 0
                  • A Former User?
                    A Former User @tntjet
                    last edited by

                    @tntjet yes, if you have taken the microstepping into account, if not make sure to do that as well.

                    E.g. if its 600 full steps and you use 16x microstepping (with or without interpolation to 265) its 600 x 16 / 360 = 26.6666.

                    1 Reply Last reply Reply Quote 1
                    • tntjetundefined
                      tntjet
                      last edited by

                      Thank you so much @ bearer , you have made my evening.

                      is it possible to make this axis continuous in the M208?

                      A Former User? 1 Reply Last reply Reply Quote 0
                      • A Former User?
                        A Former User @tntjet
                        last edited by

                        @tntjet said in Using a 4th (Rotary) Axis:

                        is it possible to make this axis continuous in the M208?

                        ref https://forum.duet3d.com/topic/16788/u-axis-without-limit/12 (i.e. not yet faik)

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                        • tntjetundefined
                          tntjet
                          last edited by

                          Legendary ! Thanks again.

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