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    help loss steps on inversions

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    • fr4nc3sco
      fr4nc3sco last edited by

      I have a problem measuring with a comparator I have loss of steps with microstep aquando inverto the axis for example:
      g1y10 shifts by 10mm then gives g1y10.1 and he goes correctly to 10.1 as he reverses g1y10 he goes in behind at about 10.05 if he then gives g1y9.9 he goes to 9.95 doing correctly 0.1 of step, as he reverses back to g1y10 he still loses 0.05mm from what can it depend? I changed straps, motor, cable, but not always solve the problem disappears if I use step full this problem does not occur but already with 1/2 makes it

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      • zapta
        zapta last edited by zapta

        Are these lost steps or backlash? E.g. if you move many times between y10 to y11, does it lose more and more steps and drifts?

        Thingiverse has a good model to test x/y backlash https://www.thingiverse.com/thing:10524

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        • fr4nc3sco
          fr4nc3sco last edited by

          https://vimeo.com/user98280453/review/343792510/2e2bd0d7d6
          this is the problem I was saying, if you have an idea, they are more than willing to solve

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          • Veti
            Veti last edited by

            link does not work

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            • fr4nc3sco
              fr4nc3sco last edited by

              https://youtu.be/Ej2VGE_aFAg

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              • dc42
                dc42 administrators last edited by

                It looks like you have backlash of about 0.06mm. What is your steps/mm in that direction, and at what microstepping?

                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

                fr4nc3sco 1 Reply Last reply Reply Quote 0
                • fr4nc3sco
                  fr4nc3sco @dc42 last edited by

                  @dc42
                  M350 X16 Y16 Z8 E16:16 I1
                  M92 X80.00 Y80.00 Z800.00 E412.88:412.88
                  M566 X300.00 Y300.00 Z12.00 E300.00:300.00
                  M203 X15000.00 Y15000.00 Z300.00 E1500.00:1500.00
                  M201 X500.00 Y500.00 Z10.00 E1000.00:1000.00
                  M906 X1700.00 Y1700.00 Z1700.00 E1700.00:1700.00 I90
                  tested motor
                  17hs19-2004s1 and 17hm19-2004-s and longer 42bygh40h-2-19d he does it with everyone

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                  • dc42
                    dc42 administrators last edited by

                    You have 80 x1/16 microsteps per mm. so each microstep is 0.0125um. It looks like when you reverse direction, it takes 4 microsteps to put enough tension in the belt on the other size of the pulley to overcome friction. Tightening the belt may help, if it's not already tight enough. It's also possible that the belt is slipping on the motor pulley, if it's not a perfect fit.

                    50um backlash should be OK for 3D printing, but perhaps not for CNC work.

                    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

                    fr4nc3sco 1 Reply Last reply Reply Quote 0
                    • fr4nc3sco
                      fr4nc3sco @dc42 last edited by

                      @dc42 said in help loss steps on inversions:

                      You have 80 x1/16 microsteps per mm. so each microstep is 0.0125um. It looks like when you reverse direction, it takes 4 microsteps to put enough tension in the belt on the other size of the pulley to overcome friction. Tightening the belt may help, if it's not already tight enough. It's also possible that the belt is slipping on the motor pulley, if it's not a perfect fit.

                      50um backlash should be OK for 3D printing, but perhaps not for CNC work.

                      could his hypothesis be real and is there a parameter to correct this error? it's possible ?

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                      • Veti
                        Veti last edited by

                        maybe change from belts to ball screws if you need that kind of precision.

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                        • fr4nc3sco
                          fr4nc3sco last edited by

                          I ordered the 9mm gates should be more rigid etc .. let's see what accuracy can bring, well let's say that the print itself brings so many errors and if we start with a bad base ... certainly will not know what, for the screws I thought but there are no such long recirculation steps to keep up with the straps

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                          • Veti
                            Veti last edited by

                            as an example see here
                            https://www.thingiverse.com/thing:2929869

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                            • fr4nc3sco
                              fr4nc3sco last edited by

                              Hi possibly to eliminate loss of steps mount a MKS SERVO42 Nema 17 closed loop with the Duet Expansion Breakout Board but then it is possible to recover the pins to make a bltouch coexist and work?

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                              • Veti
                                Veti last edited by

                                it is not lost steps. its backlash.

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                                • fr4nc3sco
                                  fr4nc3sco last edited by

                                  hi,
                                  I changed the strap with a better 9mm gates
                                  [IMG]http://i63.tinypic.com/34zc28w.jpg[/IMG]

                                  this is the problem at 1/16
                                  https://drive.google.com/file/d/1-6TC1k9jVaZar40PE5DxQoyw79dfP6_Z/view?usp=sharing

                                  while at 1/2 the problem disappears
                                  https://drive.google.com/file/d/1--GEUBKAdP7hRF3CA10b_3lvMfIiLgF-/view?usp=sharing

                                  the strange thing and that however also happens this setting 0.1mm of movement to time
                                  https://drive.google.com/file/d/10v1igg_cmjlgtJU7rxxotNrS7KxMH9Cg/view?usp=sharing

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