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    Help me understand interpolation and noise

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    • frank26080115undefined
      frank26080115
      last edited by

      I was playing around with my Z leadscrews. My hypothesis is that using x1 microstepping and x16 microstepping should behave the same if interpolation is enabled. This proves to be wrong, when moving at the same speed, using "M350 Z1 I1" makes a ton of noise while "M350 Z16 I1" is very quiet. (of course when I reconfigure these I am also changing my steps/mm, I didn't forget)

      Shouldn't interpolation make the movements sound the same no matter what microstepping setting I use? Do I have unrealistic expectations?

      deckingmanundefined Phaedruxundefined 2 Replies Last reply Reply Quote 0
      • deckingmanundefined
        deckingman @frank26080115
        last edited by

        @frank26080115 Interpolation is only applied when 16x micro stepping is used.

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

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

          @deckingman said in Help me understand interpolation and noise:

          @frank26080115 Interpolation is only applied when 16x micro stepping is used.

          That's correct, for the Duet WiFi/Ethernet. On the Duet Maestro, interpolation to x256 is supported from any microstep setting.

          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

          deckingmanundefined 1 Reply Last reply Reply Quote 0
          • deckingmanundefined
            deckingman @dc42
            last edited by

            @dc42 said in Help me understand interpolation and noise:

            @deckingman said in Help me understand interpolation and noise:

            @frank26080115 Interpolation is only applied when 16x micro stepping is used.

            That's correct, for the Duet WiFi/Ethernet. On the Duet Maestro, interpolation to x256 is supported from any microstep setting.

            One learns something new every day.............

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

            1 Reply Last reply Reply Quote 0
            • frank26080115undefined
              frank26080115
              last edited by

              arg, well, every time I make a mistake, the reply in the gcode console gave me a nice warning, this time it didn't so I thought it was ok

              I also tried to turn on stealthChop on the TMC2660 and got a nasty surprise lol

              kungpaoshiziundefined 1 Reply Last reply Reply Quote 0
              • Phaedruxundefined
                Phaedrux Moderator @frank26080115
                last edited by

                @frank26080115 said in Help me understand interpolation and noise:

                I am also changing my steps/mm

                If you set your steps per mm and microstepping to be for x16 first, you can then change the microstepping on a later line without having to manually change the steps per mm, as the firmware will take care of it for you.

                https://duet3d.dozuki.com/Wiki/Gcode#Section_M350_Set_microstepping_mode

                Z-Bot CoreXY Build | Thingiverse Profile

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                • kungpaoshiziundefined
                  kungpaoshizi @frank26080115
                  last edited by

                  @frank26080115 what was the nasty surprise?

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                  • frank26080115undefined
                    frank26080115
                    last edited by

                    @kungpaoshizi said in Help me understand interpolation and noise:

                    @frank26080115 what was the nasty surprise?

                    TMC2660 doesn't have stealthChop

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                    • kungpaoshiziundefined
                      kungpaoshizi
                      last edited by

                      Interesting.. I can say on x16 with interpolation, it's quite quiet. I can no longer tell when the printer starts printing compared to my old ramps 1.4

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                      • dc42undefined
                        dc42 administrators
                        last edited by

                        High microstepping, or interpolation, makes the motors much quieter when moving. It does not affect motor standstill noise.

                        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 0
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