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    Microstepping in relation to deviation?

    Tuning and tweaking
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    • jackatom74
      jackatom74 last edited by

      My build is a 1m delta and I am stuck at .045 being the lowest deviation I can achieve. I am currently running 1/32 microstepping with interpolation on .9 NEMA 23 motors. Would there be any benefit to dropping to 1/16 with interpolation.
      (On another thread I read about adjusting belt tightness, and plan to do that tonigt)

      One other question, can anyone explain deviation and how it is calculated?

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      • Phaedrux
        Phaedrux Moderator last edited by

        Interpolation only works with 16 microsteps.

        Z-Bot CoreXY Build | Thingiverse Profile

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        • dc42
          dc42 administrators last edited by dc42

          With x16 microstepping and 0.9deg motors, the theoretical resolution is 5um using 16 tooth pulleys (200 steps/mm). That's quite a lot less than the 45um deviation you are getting, so using higher microstepping is unlikely to help. I get around 25um deviation with this setup, using linear rails and Smart Effector.

          Deviation visit the root mean square average of the height error at the probe points.

          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

          jackatom74 2 Replies Last reply Reply Quote 1
          • jackatom74
            jackatom74 @dc42 last edited by

            @dc42 I am using 20 tooth pulleys and have set my steps accordingly, is there possible benefit to me using 16?

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            • Phaedrux
              Phaedrux Moderator last edited by

              You get to use interpolation

              Z-Bot CoreXY Build | Thingiverse Profile

              timcurtis67 1 Reply Last reply Reply Quote 0
              • timcurtis67
                timcurtis67 @Phaedrux last edited by

                @phaedrux said in Microstepping in relation to deviation?:

                You get to use interpolation

                To avoid confusion, I believe @jackatom74 is refering to a 16 tooth pulley. Not 1/16 microstepping.

                Phaedrux 1 Reply Last reply Reply Quote 1
                • Phaedrux
                  Phaedrux Moderator @timcurtis67 last edited by

                  @timcurtis67 I guess I shouldn't browse the forum before coffee.

                  Z-Bot CoreXY Build | Thingiverse Profile

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                  • timcurtis67
                    timcurtis67 last edited by

                    @Phaedrux Yeah I do that all the time... ☺

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                    • jackatom74
                      jackatom74 @dc42 last edited by jackatom74

                      @dc42 said in Microstepping in relation to deviation?:

                      Deviation visit the root mean square average of the height error at the probe points.

                      Thank You DC42, Something clicked in my head and I went back and looked at the the repeatably of my trigger height and started messing with the smart effector sensitivity. Correcting this fixed everything. I am around 20um deviation now, Also thank you to everyone else who lent me their guidance.

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