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Duet3 6CH + 3CH expansion board - Missing steps.

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Tuning and tweaking
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  • undefined
    Phaedrux Moderator
    last edited by 11 Jan 2021, 21:09

    Thanks for testing.

    Z-Bot CoreXY Build | Thingiverse Profile

    1 Reply Last reply Reply Quote 1
    • undefined
      jbarros
      last edited by jbarros 1 Dec 2021, 00:56 12 Jan 2021, 00:55

      Not trying to hijack the thread but I got "similar" issues on a 6HC + Toolboard running 3.2
      I only see the issue on round surfaces on which there are no retractions (set at 0.2) and PA from the ~middle of the hole was set from 0.005 to 0 which made it worse?!
      A previous print with bigger retraction 0.3 and bigger PA 0.02 had issues but not of this magnitude, which is curious.

      I can start a new thread with all the info if necessary.
      fail.jpg

      undefined 1 Reply Last reply 12 Jan 2021, 02:33 Reply Quote 0
      • undefined
        Phaedrux Moderator @jbarros
        last edited by 12 Jan 2021, 02:33

        @jbarros said in Duet3 6CH + 3CH expansion board - Missing steps.:

        I can start a new thread with all the info if necessary.

        Please do.

        Z-Bot CoreXY Build | Thingiverse Profile

        1 Reply Last reply Reply Quote 0
        • undefined
          hackinistrator @evomotors
          last edited by 12 Jan 2021, 07:49

          @evomotors
          are you 100% sure that its "data loss" causing the issue ?
          it seems you set everything correctly (i'm far from being expert...) maybe the board ignores your current limit settings .
          can you try running the same gcode (or simple high accel macro) while the motors disconnected from the load (remove belts) ?
          i'm not sure its a comm speed issue . maybe the tboard simply ignores motor current settings .

          undefined undefined 2 Replies Last reply 12 Jan 2021, 13:04 Reply Quote 0
          • undefined
            evomotors @hackinistrator
            last edited by evomotors 1 Dec 2021, 13:16 12 Jan 2021, 13:04

            @hackinistrator said in Duet3 6CH + 3CH expansion board - Missing steps.:

            @evomotors
            are you 100% sure that its "data loss" causing the issue ?
            it seems you set everything correctly (i'm far from being expert...) maybe the board ignores your current limit settings .
            can you try running the same gcode (or simple high accel macro) while the motors disconnected from the load (remove belts) ?
            i'm not sure its a comm speed issue . maybe the tboard simply ignores motor current settings .

            I'm not 100% sure that it's caused by data loss. If I set my motors current limits correctly it should not ignore them, unless there is a bug in the firmware.

            I prefer not to remove belts, but even if I do, what it is going to prove? How can you tell if gantry in the correct position if belts are disconnected?

            But you maybe correct, it does feels like motors ether underpowered or pulses are irregular on these fast moves. Unfortunately there is no way for me to tell, I don't have oscilloscope on hands. But it should be really easy for @dc42 to test.

            I'm still waiting for @dc42 to look at the videos and reply.

            1 Reply Last reply Reply Quote 0
            • undefined
              deckingman @hackinistrator
              last edited by 12 Jan 2021, 14:20

              @hackinistrator Have you watched the videos that @evomotors posted? If the board ignores the motor current, then it does so selectively at some seemingly random time after a print starts, then restores it again immediately after.

              Ian
              https://somei3deas.wordpress.com/
              https://www.youtube.com/@deckingman

              undefined 1 Reply Last reply 12 Jan 2021, 20:40 Reply Quote 0
              • undefined
                evomotors
                last edited by 12 Jan 2021, 17:29

                I'm getting lonely here after proving existence of the issue. 👎

                @dc42 Do you want me to perform some additional tests?

                1 Reply Last reply Reply Quote 0
                • undefined
                  Phaedrux Moderator
                  last edited by 12 Jan 2021, 17:33

                  Thanks for your patience. He's aware and will respond ASAP.

                  Z-Bot CoreXY Build | Thingiverse Profile

                  undefined 1 Reply Last reply 12 Jan 2021, 17:34 Reply Quote 0
                  • undefined
                    evomotors @Phaedrux
                    last edited by 12 Jan 2021, 17:34

                    @Phaedrux said in Duet3 6CH + 3CH expansion board - Missing steps.:

                    Thanks for your patience. He's aware and will respond ASAP.

                    Oh thanks! The good news that I'm not alone here.

                    undefined undefined 2 Replies Last reply 12 Jan 2021, 18:24 Reply Quote 0
                    • undefined
                      deckingman @evomotors
                      last edited by 12 Jan 2021, 18:24

                      @evomotors For want of anything better to say or suggest, have you tried commenting out the M593 (DAA) to see if that makes any difference? No reason for suggesting it other than it's something which modifies motion planning, which might get applied to main boards but not expansion boards. I don't know if that's even possible but testing without M593 would at least eliminate it as a potential cause. Just a thought if you've got nothing better to do while you are waiting...........

                      Ian
                      https://somei3deas.wordpress.com/
                      https://www.youtube.com/@deckingman

                      1 Reply Last reply Reply Quote 0
                      • undefined
                        dc42 administrators @evomotors
                        last edited by 12 Jan 2021, 20:22

                        @evomotors, I believe at least some of these issues are caused by CAN clock sync jitter, meaning that the expansion board clocks don't run perfectly in sync either the main board. When I measured it, I found that it was higher than I expected, frequently reaching 300us and sometimes more under conditions of high step rates and short move segments. Fortunately we've had a plan to reduce this jitter ever since we designed Duet 3. I've been working on this all day, and the jitter is now reduced to 13us even with heavy traffic. There is the possibility to reduce it still further.

                        I have two other related issues to investigate before we release an early 3.3 beta.

                        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

                        undefined 1 Reply Last reply 12 Jan 2021, 21:18 Reply Quote 1
                        • undefined
                          hackinistrator @deckingman
                          last edited by 12 Jan 2021, 20:40

                          @deckingman sure , i watched the vid.
                          i'm not sure if the issue occurs at random time.
                          if you check the vid , you can see the printer completed pretty fast accel moves without issues while moving on XY plane .
                          the issue occurred when it was making fast diagonal move - single motor running .
                          what is the default motor current on those drivers anyways ?
                          maybe its a good idea to try and reduce motor current on exp. board to very low value and see if it has any effect .
                          there are no CAN errors so i don't see how it can be comm. error .

                          undefined 1 Reply Last reply 12 Jan 2021, 21:12 Reply Quote 0
                          • undefined
                            T3P3Tony administrators @hackinistrator
                            last edited by 12 Jan 2021, 21:12

                            @hackinistrator there is some timing jitter (as @dc42 has pointed out) that is not currently reported in 3.2.

                            @evomotors thanks for all the work in detailing the problem, we are working on it!

                            www.duet3d.com

                            1 Reply Last reply Reply Quote 1
                            • undefined
                              evomotors @dc42
                              last edited by evomotors 1 Dec 2021, 21:36 12 Jan 2021, 21:18

                              @dc42 @T3P3Tony
                              Thank you for your hard work. Waiting to test the changes.

                              1 Reply Last reply Reply Quote 0
                              • undefined
                                dc42 administrators
                                last edited by dc42 14 Jan 2021, 17:53

                                I am pleased to report that we have made substantial progress on this issue. In addition to fixing the CAN clock jitter, we have identified and fixed an issue that could cause whole moves to be abandoned on CAN-connected expansion boards. We have only been able to reproduce this using high step rates and short moves, however the cause of the issue (floating point rounding error) could conceivably happen at lower step rates too.

                                I expect to provide unofficial 3.3beta versions of all firmwares tomorrow.

                                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

                                undefined undefined 2 Replies Last reply 14 Jan 2021, 19:07 Reply Quote 2
                                • undefined
                                  Luke'sLaboratory @dc42
                                  last edited by 14 Jan 2021, 19:07

                                  @dc42 Holy crap! Big if true!!!!!! I can't wait to try out the firmware to see if it solves my issues!

                                  Luke
                                  http://lukeslab.online

                                  1 Reply Last reply Reply Quote 0
                                  • undefined
                                    evomotors @dc42
                                    last edited by 14 Jan 2021, 19:59

                                    @dc42
                                    Do you need a beta tester? 🙂

                                    undefined 1 Reply Last reply 14 Jan 2021, 20:13 Reply Quote 0
                                    • undefined
                                      Veti @evomotors
                                      last edited by 14 Jan 2021, 20:13

                                      @evomotors said in Duet3 6CH + 3CH expansion board - Missing steps.:

                                      Do you need a beta tester?

                                      always welcome.

                                      the firmware will be available for all here
                                      https://github.com/Duet3D/RepRapFirmware/releases

                                      1 Reply Last reply Reply Quote 0
                                      • undefined
                                        evomotors
                                        last edited by 16 Jan 2021, 00:25

                                        @dc42 Any updates? I guess there some roadblocks with other issues.

                                        undefined 1 Reply Last reply 16 Jan 2021, 10:13 Reply Quote 0
                                        • undefined
                                          dc42 administrators @evomotors
                                          last edited by 16 Jan 2021, 10:13

                                          @evomotors, https://forum.duet3d.com/topic/20991/early-rrf-3-3beta-files-available

                                          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

                                          undefined 1 Reply Last reply 16 Jan 2021, 16:06 Reply Quote 0
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