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    Polar kinematics type 3D printer software setup help

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    • dc42undefined
      dc42 administrators @iamthebest22
      last edited by

      ; homeall.g
      ; called to home all axes
      ;
      ; generated by RepRapFirmware Configuration Tool v2.1.2 on Thu Nov 14 2019 21:46:59 GMT-0800 (Pacific Standard Time)
      ;home radius X first
      G91 ; relative positioning
      G1 H2 Z4 F6000 ; lift Z relative to current position
      G1 H1 X111 F3000 ; move radius towards MAXIMUM until the endstop switch is triggered
      G1 H2 X100 ; move radius IN by 11mm
      G1 H1 X113 F600 ; move radius slowly to the endstop switch again

      Your G1 H1 move homes to the endstop switch successfully. But you are still in relative mode when you execute the next 2 G1 commands, so it continues to try to move in the same direction.

      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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      • iamthebest22undefined
        iamthebest22
        last edited by

        ah so should I change the homeall and homeradius (since they use the same gcode) part to:

        ;home radius X first
        G91 ; relative positioning
        G1 H2 Z4 F6000 ; lift Z relative to current position
        G1 H1 X111 F3000 ; move radius towards MAXIMUM until the endstop switch is triggered
        G1 H2 X-11 ; move radius IN by 11mm
        G1 H1 X12 F600 ; move radius slowly to the endstop switch again

        is this correct?

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        • dc42undefined
          dc42 administrators
          last edited by

          Yes, that looks better.

          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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          • iamthebest22undefined
            iamthebest22
            last edited by

            Thank you very much, it works now, now the question since this is so much different than a cartesian or usual corexy, is there a gcode where I can test it "printing" (I forgot what the function is called, basically it's not actually printing just repeating the loop) a 20mm by 20mm cube to see if I got the Y axis right? (the X and Z has been fully calibrated since they are straight, just the Y since it's the a turntable now). Thanks.

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            • iamthebest22undefined
              iamthebest22
              last edited by

              Also another question (sorry for so many question new at Polar kinematics), when I press to increase Y axis (say +10) the turntable turns counterclockwise, is that correct or should it be clockwise when I increase Y ?

              dc42undefined 1 Reply Last reply Reply Quote 0
              • JoergS5undefined
                JoergS5
                last edited by JoergS5

                A Y movement or a X movement is translated into a rotary plus linear movement of the polar printer.
                X and Y are the coordinates which are used by the G-Code file and are the real word coordinations, perpendicular.
                The polar printer on the other side has a rotation movement and a linear movement.

                The X and Y coordinates are translated by firmware to the stepper commands for rotation and linear motion.

                So your G-Code commands for X, Y, Z, are the same like for a cartesian, delta, corexy... printer. The firmware translates it, depending on the printer type.

                For a test print, you need a model (often stl format) of the cube and create a gcode file in a program e.g. Cura. This g-code file can be uploaded to Duet and printed.

                To see if your rotation is correct, I would look which line the nozzle draws (imaginary) on the print bed.

                iamthebest22undefined 1 Reply Last reply Reply Quote 0
                • iamthebest22undefined
                  iamthebest22 @JoergS5
                  last edited by

                  @JoergS5 yeah that's what I mean, so I guess I'll just slice a 20mm cube in the slicer of my choice and upload it and Simulate file in the Duet and then see what it does? Thanks.

                  Danalundefined 1 Reply Last reply Reply Quote 0
                  • Danalundefined
                    Danal @iamthebest22
                    last edited by

                    @iamthebest22 said in Polar kinematics type 3D printer software setup help:

                    @JoergS5 yeah that's what I mean, so I guess I'll just slice a 20mm cube in the slicer of my choice and upload it and Simulate file in the Duet and then see what it does? Thanks.

                    Yep. Or even take the "heat" command out and print it with no filament, if you want to watch it move.

                    Delta / Kossel printer fanatic

                    iamthebest22undefined 1 Reply Last reply Reply Quote 0
                    • iamthebest22undefined
                      iamthebest22 @Danal
                      last edited by

                      @Danal oh yeah I need to take that out, that always bugged me how it still turns on heater for that. So what you mean is I edit the gcode to take out the temp right?

                      Danalundefined 1 Reply Last reply Reply Quote 0
                      • iamthebest22undefined
                        iamthebest22
                        last edited by

                        Another question just came up, i haven't set which bed leveling system I should use, now according to https://duet3d.dozuki.com/Wiki/Using_mesh_bed_compensation there's two types, one for cartesian/corexy, and the other for a delta printer. I'm assuming since I'm using Polar type and it has a circular bed, I should use the Delta type? So my M557 should look something like this?

                        M557 R80 S20 ; probe within a radius of 80mm from the centre with a mesh spacing of 20mm

                        is this correct?

                        currently it's this:
                        ; Z-Probe
                        M558 P9 H5 F120 T6000 ; set Z probe type to bltouch and the dive height + speeds
                        G31 P500 X-17 Y22.5 Z2.5 ; set Z probe trigger value, offset and trigger height
                        M557 X15:70 Y15:75 S20 ; define mesh grid

                        Should I change it to:
                        ; Z-Probe
                        M558 P9 H5 F120 T6000 ; set Z probe type to bltouch and the dive height + speeds
                        G31 P500 X-17 Y22.5 Z2.5 ; set Z probe trigger value, offset and trigger height
                        M557 R80 S20 ; probe within a radius of 80mm from the centre with a mesh spacing of 20mm

                        Thanks.

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                        • dc42undefined
                          dc42 administrators @iamthebest22
                          last edited by dc42

                          @iamthebest22 said in Polar kinematics type 3D printer software setup help:

                          Also another question (sorry for so many question new at Polar kinematics), when I press to increase Y axis (say +10) the turntable turns counterclockwise, is that correct or should it be clockwise when I increase Y ?

                          That sounds wrong to me, I think it should be clockwise, otherwise your prints will come out mirrored. Use the M569 S parameter to change the direction of the Y driver.

                          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

                          iamthebest22undefined 1 Reply Last reply Reply Quote 0
                          • iamthebest22undefined
                            iamthebest22 @dc42
                            last edited by

                            @dc42 good to know, btw should I change the mesh probe map setting to what I said above? from the current M557 X15:70 Y15:75 S20 ; define mesh grid to

                            M557 R80 S20 ; probe within a radius of 80mm from the centre with a mesh spacing of 20mm since it's a circular bed?

                            dc42undefined 1 Reply Last reply Reply Quote 0
                            • Danalundefined
                              Danal @iamthebest22
                              last edited by

                              @iamthebest22 said in Polar kinematics type 3D printer software setup help:

                              @Danal oh yeah I need to take that out, that always bugged me how it still turns on heater for that. So what you mean is I edit the gcode to take out the temp right?

                              Yep. If you wish to watch the printer a few times before you print, edit the temp commands (there will be three or four) out of the beginning of the G-Code file, unload filament, and print. Then you can observe.

                              Delta / Kossel printer fanatic

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                              • Danalundefined
                                Danal
                                last edited by

                                And I'm not 100% certain on probe... but, were it me, I'd start with Delta-style.

                                Delta / Kossel printer fanatic

                                iamthebest22undefined 1 Reply Last reply Reply Quote 0
                                • iamthebest22undefined
                                  iamthebest22 @Danal
                                  last edited by iamthebest22

                                  @Danal I think Delta style worked, now since my furthest offset is 22.5 on the Y.... I'm really not sure if I have the offset correct to be honest. I took a video cause I don't think photos would make it easier, but here's what I got for the X and Y offset (ignore Z for now, that's easy for me)

                                  G31 P500 X-17 Y22.5 Z2.5 ; set Z probe trigger value, offset and trigger height

                                  and the video, https://www.dropbox.com/s/0nzm7cikaxfzp2z/2019-12-15 20.02.39.mp4?dl=0

                                  dc42undefined 1 Reply Last reply Reply Quote 0
                                  • dc42undefined
                                    dc42 administrators @iamthebest22
                                    last edited by

                                    @iamthebest22 said in Polar kinematics type 3D printer software setup help:

                                    @dc42 good to know, btw should I change the mesh probe map setting to what I said above? from the current M557 X15:70 Y15:75 S20 ; define mesh grid to

                                    M557 R80 S20 ; probe within a radius of 80mm from the centre with a mesh spacing of 20mm since it's a circular bed?

                                    The only issue I can see with that is that it will try to probe at X0 Y0, which may be unreachable depending on your probe offset.

                                    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

                                    1 Reply Last reply Reply Quote 1
                                    • dc42undefined
                                      dc42 administrators @iamthebest22
                                      last edited by dc42

                                      @iamthebest22 said in Polar kinematics type 3D printer software setup help:

                                      @Danal I think Delta style worked, now since my furthest offset is 22.5 on the Y.... I'm really not sure if I have the offset correct to be honest. I took a video cause I don't think photos would make it easier, but here's what I got for the X and Y offset (ignore Z for now, that's easy for me)

                                      G31 P500 X-17 Y22.5 Z2.5 ; set Z probe trigger value, offset and trigger height

                                      and the video, https://www.dropbox.com/s/0nzm7cikaxfzp2z/2019-12-15 20.02.39.mp4?dl=0

                                      In answer to the questions in your video:

                                      Assuming that you haven't set a nozzle offset, the carriage is at X=0 when the nozzle is over the rotation axis of the turntable. It's up to you to decide which direction from that you want to be +X. If the nozzle can reach the edge of the bed when it moves in one direction, but not when it moves in the opposite direction, I suggest you make the first direction +X. RRF will only make use of positive X values.

                                      Now orient yourself in relation to the printer with +X to the right. +Y will be away from you. If the Z probe is to the right of the nozzle, the probe X offset is positive, else it is negative. If it is further away from you than the nozzle, that's in the +Y direction so the probe Y offset is positive. If it is nearer you than the nozzle, that's a negative Y offset.

                                      If the nozzle is printing at Y=0 and it needs to go to a positive Y point, that positive Y point is further away from you than the radius arm, so the turntable will need to rotate clockwise to bring that point under the radius arm. So clockwise turntable motion is positive.

                                      I don't have a polar printer, so I can't guarantee that the above is 100% correct.

                                      HTH David

                                      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

                                      iamthebest22undefined 1 Reply Last reply Reply Quote 0
                                      • iamthebest22undefined
                                        iamthebest22 @dc42
                                        last edited by

                                        @dc42 Ah I think I got it, I was in the wrong orientation of the video, so I think I got it, I went to the other side as you can see in this new video, so +x is to the right, so the BLtouch is to the left of the nozzle, so that's -x for sure.

                                        As for the Y I think I got it too, since it's closer to the nozzle to me, that means it's negative too, thanks.

                                        new video: https://www.dropbox.com/s/tk43aqloukbb8m9/2019-12-16 16.42.25.mp4?dl=0

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                                        • dc42undefined
                                          dc42 administrators
                                          last edited by

                                          Yes that looks correct to me.

                                          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

                                          1 Reply Last reply Reply Quote 1
                                          • shadiundefined
                                            shadi @iamthebest22
                                            last edited by

                                            @iamthebest22 just want to know if you have managed to run the machine output correctly, I have designed a machine that has polar coordinates where Y is turntable and X and Z are moving on the plate basically machine should move theta in Y and R on X , I would ask your help if you managed to resolve the issues you are facing on your machine for me the machine prints a skewed shapes with round edges and i am not able to come over this machine shape is flipped L where the base is Y , Z goes up and down and X moves by R value .

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