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    Parallel Scara based on Morgan.

    My Duet controlled machine
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    • Phospherus
      Phospherus last edited by Phospherus

      Bit of an update firmware seems solid but unfortunately I thought 15mm diameter carbon fiber tube would be strong enough for the rotational forces and i was wrong. I have some twisting which causes a springiness on the inner shaft. Now going to 25mm for the inner shaft which is the diameter the outer used to be and 30mm for the outer.

      I also purchased a set of https://www.amazon.com/gp/product/B0BQ728M9F/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

      These are 30:1 with 0.6 degree steppers. Supposed to have 2 Arcmin back lash which is 0.03 degree so should be plenty accurate. I thought about going true 5 bar with those mounted 45mm apart I would have the same print area as I do now. Anyone have any experience with these?

      o_lampe 1 Reply Last reply Reply Quote 0
      • o_lampe
        o_lampe @Phospherus last edited by

        @Phospherus said in Parallel Scara based on Morgan.:

        These are 30:1 with 0.6 degree steppers

        The way I read it, it's a regular 1.8° motor and the 30:1 reduction results in 0.06°step angle

        Phospherus 1 Reply Last reply Reply Quote 0
        • Phospherus
          Phospherus @o_lampe last edited by

          @o_lampe I see now thanks for pointing that out. I hope they are decent quality and good enough.

          JoergS5 o_lampe 2 Replies Last reply Reply Quote 0
          • JoergS5
            JoergS5 @Phospherus last edited by JoergS5

            @Phospherus I'd wish you open it in a iFixit style and post some images to discuss the quality. Unfortunately - I completely understand it - you'll not want to do it because of the guarantee. But if it's damaged in the future, this would be valuable. They are out of stock and a bit too expensive to buy it just for testing.

            1 Reply Last reply Reply Quote 0
            • o_lampe
              o_lampe @Phospherus last edited by o_lampe

              @Phospherus It surprised me, that they took a short NEMA17 motor with low torque for it. I guess a full size motor would exceed the max. output torque of the harmonic drive.

              1 Reply Last reply Reply Quote 0
              • Phospherus
                Phospherus last edited by

                First printing with the Scara looking good so far. No z endstop so set it with piece of paper and no heated bed as my PSU mount is printing so running off a 5 amp 24V power pack. Using a Bondtech BMG for bowden drive with a Phaetus BMO hotend. Link to youtube video below. This is my first time ever uploading to youtube so if it does not work I apologize and will fix it.

                https://youtu.be/9VRnl9GF-Sk

                o_lampe 1 Reply Last reply Reply Quote 2
                • o_lampe
                  o_lampe @Phospherus last edited by

                  This post is deleted!
                  Phospherus 2 Replies Last reply Reply Quote 0
                  • Phospherus
                    Phospherus @o_lampe last edited by

                    This post is deleted!
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                    • Phospherus
                      Phospherus @o_lampe last edited by

                      @o_lampe Video link should work now.

                      o_lampe 1 Reply Last reply Reply Quote 0
                      • o_lampe
                        o_lampe @Phospherus last edited by

                        @Phospherus Looks good for a first print on a cold bed. 👍

                        1 Reply Last reply Reply Quote 0
                        • Phospherus
                          Phospherus last edited by

                          A couple pictures of the first print complete. I am amazed how good it came out without part cooling even.20230309_121359.jpg 20230309_121421.jpg

                          1 Reply Last reply Reply Quote 2
                          • Phospherus
                            Phospherus last edited by

                            Finally got a test set of arms printed and a mount for the Nema 17 harmonic drives. Here it is in action. https://youtube.com/shorts/bj47uQ08zV0?feature=share

                            o_lampe 1 Reply Last reply Reply Quote 1
                            • o_lampe
                              o_lampe @Phospherus last edited by o_lampe

                              @Phospherus It's always hard to qualify mechanics from a video. The first impression is good, no visible backlash or springiness.
                              Will be interesting to see it work, maybe with a feltpen for starters?
                              Would you use a direct drive extruder as toolhead or is it strictly Bowden-setup? How much does the head sag?

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