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    Scara Setup

    Scheduled Pinned Locked Moved
    Tuning and tweaking
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    • DannyDefeundefined
      DannyDefe
      last edited by

      David
      I would like the ability to do 360 degree continuous prints. This means I'm printing continuously Non-Stop around the perimeter of the Scara.

      Because of this request, I also have proximity sensor on the prox arm. This sensor requires 5v, so what's the best way to wire this?
      thanks

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      • dc42undefined
        dc42 administrators
        last edited by

        What type of output does the prox sensor have?

        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

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        • DannyDefeundefined
          DannyDefe
          last edited by

          So what's the answer can we run 360 continuous?

          LJ8A3-2-Z BX
          Voltage: DC 5V
          Theory: Inductance Sensor
          Detection distance: 4mm
          Output current: 200mA
          Polarity: NPN
          Ouput Status: Normally Open
          Detect Object : Iron 15151mm
          Response frequency: DC:0.5kHz AC:25Hz
          Wire type: 3 wire type (Brown, Blue, Black

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          • dc42undefined
            dc42 administrators
            last edited by

            You can connect that sensor directly to the Gnd and Stp pins of the endstop input, and power it from 5V.

            I can't think if any reason why you can't configure the proximal arm to have a range of -180 to +180 degrees.

            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

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            • DannyDefeundefined
              DannyDefe
              last edited by

              David I don't think you understand my request.
              I have a big scara , and I'm printing a large object with the machine in the center. Therefore I need to have the ability to go continuously in rotation as I built the object around the machine.

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              • dc42undefined
                dc42 administrators
                last edited by

                I see what you mean. That isn't currently supported, but I will give i some thought.

                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

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                • DannyDefeundefined
                  DannyDefe
                  last edited by

                  David I'm currently running smoothie with working continuous revolving future and in order for me to switch over this is necessary. I would appreciate if you could stick this into the firmware code.

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                  • dc42undefined
                    dc42 administrators
                    last edited by

                    I'll add it to the list, but I have a deadline for the 1.21 release and I may not have time it implement it by then.

                    How do you propose to home the proximal arm? Or do you not bother?

                    Do you have some sort of slip ring arrangement to allow the proximal arm to rotate continuously without the hot end wires getting twisted?

                    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

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                    • DannyDefeundefined
                      DannyDefe
                      last edited by

                      I have a standard homing sequence for the prox, and after homing this switch is ignored.
                      And yes I have continuous slip ring .
                      What's the deadline to finish 1.21?

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                      • DannyDefeundefined
                        DannyDefe
                        last edited by

                        Prox switch

                        [[url]https://www.dropbox.com/s/pd58x96vdv9nci7/20180213_101118.jpg?dl=0]

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                        • dc42undefined
                          dc42 administrators
                          last edited by

                          The deadline for the 1.21 release it the end of this month. I will try to include provisional support in the next RC, but I will need you to test it because I don't have a continuous-rotation SCARA arm.

                          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

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                          • DannyDefeundefined
                            DannyDefe
                            last edited by

                            No problem with testing, we just installed Duets on the large scara.

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                            • DannyDefeundefined
                              DannyDefe
                              last edited by

                              My first problem is that I have 2 WiFi networks within range. They both show up as available but I would like to only connect to the new router I purchased which is in close proximity of the Duets. How do I get rid of the first router I entered? Because sometimes it can't make up its mind and it gets confusing.

                              I have strong WiFi signal - 36 DB (M122)with the new router I purchase purposely to be close to the unit. But even with that strong signal I get a (Ajax error, reason time out)
                              The Duets will connect up with no problem and the connection is fine until I start to enter commands. So if I ask it to print it doesn't get through the entire homing sequence and the connection is dropped. Then I get the Ajax error message.

                              It reconnects fine and stays connected but if I ask it to even home 1 axis it will disconnect???

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                              • dc42undefined
                                dc42 administrators
                                last edited by

                                1. See the M588 command for how to forget the other WiFi network.

                                2. Check the MaxReps figure in the M122 report after homing and running other commands. A combination of high microstepping and a high homing speed can starve the processor of course cycles, causing WiFi disconnections.

                                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

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                                • DannyDefeundefined
                                  DannyDefe
                                  last edited by

                                  Micro stepping is set at 1 and the Homing speed is relatively slow.
                                  M92 is 23563.7373. Steps / degree

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                                  • dc42undefined
                                    dc42 administrators
                                    last edited by

                                    That's a very high steps/degree! I suggest you position the arm so that it executes a long homing move for both arms, then home the printer, then run M122 (reconnect if necessary first) and read off MaxReps from the report. Note that MaxReps gets reset after you run M122, so only the value in the first M122 after homing is significant.

                                    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

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                                    • dc42undefined
                                      dc42 administrators
                                      last edited by

                                      @DannyDefe:

                                      No problem with testing, we just installed Duets on the large scara.

                                      I have implemented continuous rotation and my simulations on a bench set up (not an actual printer) seem to indicate it is working. So please try the 1.21RC2 release when it is available a few minutes from now. To enable continuous rotation of a joint, set the min and max angle ranges for that joint in the M669 command such that max - min > 360. Then the min and max values won't be used to limit the travel, however one of them will still be used to determine the position when homed.

                                      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

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                                      • DannyDefeundefined
                                        DannyDefe
                                        last edited by

                                        MaxReps: 0, StepErrors: 0, FreeDm: 240, MinFreeDm 240, MaxWait: 0ms, Underruns: 0, 0

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                                        • DannyDefeundefined
                                          DannyDefe
                                          last edited by

                                          M122 link
                                          https://www.dropbox.com/s/k0xfx3e99gpzeey/M122.txt?dl=0

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                                          • Dougal1957undefined
                                            Dougal1957
                                            last edited by

                                            @dc42:

                                            @DannyDefe:

                                            No problem with testing, we just installed Duets on the large scara.

                                            I have implemented continuous rotation and my simulations on a bench set up (not an actual printer) seem to indicate it is working. So please try the 1.21RC2 release when it is available a few minutes from now. To enable continuous rotation of a joint, set the min and max angle ranges for that joint in the M669 command such that max - min > 360. Then the min and max values won't be used to limit the travel, however one of them will still be used to determine the position when homed.

                                            David

                                            Are you close to committing this yet have seen the Whatsnew.md but Git is still showing 1.21RC1

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