Duet3D Logo Duet3D
    • Tags
    • Documentation
    • Order
    • Register
    • Login

    Please Help me interpret accelerometer

    Scheduled Pinned Locked Moved
    Tuning and tweaking
    5
    9
    613
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • TypQxQundefined
      TypQxQ
      last edited by TypQxQ

      Hi!
      I’m building a printer, CoreXY toolchanger, 500x500x600 build area.
      When Irun the accelerometer on the carriage I get very hight response at very low frequency. Around 0.7 and 2Hz regardless of M201 setting, regardless of whether I tighten or loosen my belts.

      Now using 3.4b6 but same problem since I got the accelerometer when this was first introduced.

      My speed settings for XY:
      M556 50
      M203 33900 (reaching 500mm/s when collecting accelerometer data)
      M201 5000
      M204 5000

      Collecting after 4s wait with:
      M955 P0 C"0.spi.cs2+0.spi.cs3" I41
      M956 P0 S1000 A0 G4 P10 G1 X100 F30000

      !43F18A00-E986-4506-A927-E0AE0426BFEE.png 33338DF5-E0C8-4D42-8A83-FCCF844AA48F.png

      I’ve been having this issue since the beginning and I now thaught that I’d ask for help.

      This are some imaages of the printer if it helps:
      image.jpg
      image.jpg

      Also, my config files are at: https://github.com/TypQxQ/DuetBackup/tree/main/qTC-backup

      Thank you for looking at this.

      T3P3Tonyundefined 1 Reply Last reply Reply Quote 0
      • T3P3Tonyundefined
        T3P3Tony administrators @TypQxQ
        last edited by

        @typqxq i don't see a M955 to configure the accelerometer. specifically you need to set the orientation based on the axis of your machine.

        https://duet3d.dozuki.com/Wiki/M955

        www.duet3d.com

        TypQxQundefined 1 Reply Last reply Reply Quote 0
        • TypQxQundefined
          TypQxQ @T3P3Tony
          last edited by

          @t3p3tony Forgot about it, have it in a macro:

          M955 P0 C"0.spi.cs2+0.spi.cs3" I41
          
          T3P3Tonyundefined 1 Reply Last reply Reply Quote 0
          • T3P3Tonyundefined
            T3P3Tony administrators @TypQxQ
            last edited by

            @typqxq ahh ok. Looking at your accelerometer mounting I think I41 is correct.

            Can you try using the Input shaping plugin rather than the accelerometer plugin, This uses the accelerometer to measure vibration after a deceleration.

            https://forum.duet3d.com/topic/25999/inputshaping-plugin-0-2-0-pre8-released

            www.duet3d.com

            TypQxQundefined 1 Reply Last reply Reply Quote 0
            • TypQxQundefined
              TypQxQ @T3P3Tony
              last edited by

              @t3p3tony Thank you! This looks much better!
              1FF2996E-F665-4B1F-98C2-259D15FB7472.png
              657580F2-9A3F-48AA-B504-6C7897FA2014.png

              Topengaundefined 1 Reply Last reply Reply Quote 0
              • Topengaundefined
                Topenga @TypQxQ
                last edited by

                @typqxq said in Please Help me interpret accelerometer:

                @t3p3tony Thank you! This looks much better!
                1FF2996E-F665-4B1F-98C2-259D15FB7472.png
                657580F2-9A3F-48AA-B504-6C7897FA2014.png

                Hello together,

                I was reading several times about using an accelometer to measure resonances..... For sure it's a stupid question but is that device helpful to adjust the Jerk as well the max. acceleration somehow.... And if yes, how!?!? I'm wondering if that will help me to adjust my printer a bit propped/smoother than it is right now..... And where I can find some information about that topic.

                Sorry for asking that stupid questions but I can't find any helpful information for me as a rooky regarding Duet and RepRap FW.

                Many thanks

                Danijel

                massimilianocontiundefined 2 Replies Last reply Reply Quote 0
                • massimilianocontiundefined
                  massimilianoconti @Topenga
                  last edited by massimilianoconti

                  SIMPLY WHEN ANALYZING THE GRAPH IN THE FREQUENCY (EX: AXIS x )RANGE WITHIN 100 HZ YOU TAKE THEHIGHER PEAK FREQUENCY, THEN IN CONFIG ENTER THE CODE TO COMPENSATE FOR THAT FREQUENCY

                  EX:M593 P"zvd" F70

                  Exerqtorundefined 1 Reply Last reply Reply Quote 0
                  • Exerqtorundefined
                    Exerqtor @massimilianoconti
                    last edited by

                    @massimilianoconti said in Please Help me interpret accelerometer:

                    SIMPLY WHEN ANALYZING THE GRAPH IN THE FREQUENCY (EX: AXIS x )RANGE WITHIN 100 HZ YOU TAKE THEHIGHER PEAK FREQUENCY, THEN IN CONFIG ENTER THE CODE TO COMPENSATE FOR THAT FREQUENCY

                    EX:M593 P"zvd" F70

                    INDOOR VOICE!

                    1 Reply Last reply Reply Quote 1
                    • massimilianocontiundefined
                      massimilianoconti @Topenga
                      last edited by

                      however I would check the mechanics from the belts to the bearings and the frame, from the graph you can see many peaks of great value, which suggests a significant mechanical instability ... I'll show you my graph by X axisCattura.JPG

                      1 Reply Last reply Reply Quote 0
                      • First post
                        Last post
                      Unless otherwise noted, all forum content is licensed under CC-BY-SA