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    Triple Z Axis G32 Bed Traming

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    • fcwiltundefined
      fcwilt @Turricann
      last edited by

      @Turricann said in Triple Z Axis G32 Bed Traming:

      @fcwilt you are correct the lead screw points are outside the bed area however the probe points are the position where the bed mount attaches to the bed unless you know of a way to put an offset in for the actual positions ?

      How is it possible to probe at the lead screw locations? How can the probe get to those location without colliding with the lead screws?

      The M671 values should be the actual XY position of each leadscrew while the G30 XY positions should be somewhere on the bed.

      Frederick

      Printers: a E3D MS/TC setup and a RatRig Hybrid. Using Duet 3 hardware running 3.4.6

      jay_s_ukundefined Turricannundefined 2 Replies Last reply Reply Quote 0
      • jay_s_ukundefined
        jay_s_uk @fcwilt
        last edited by

        @fcwilt or the kinematic mount positions

        Owns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF. Assume I'm running whatever the latest beta/stable build is

        A Former User? 1 Reply Last reply Reply Quote 0
        • A Former User?
          A Former User @jay_s_uk
          last edited by

          @jay_s_uk said in Triple Z Axis G32 Bed Traming:

          @fcwilt or the kinematic mount positions

          That's a more accurate explanation

          @fcwilt some printers the lead screws only job is to move the axis, and they can also have pivots used to eliminate over constraining that axis

          fcwiltundefined 1 Reply Last reply Reply Quote 0
          • Turricannundefined
            Turricann @fcwilt
            last edited by Turricann

            @fcwilt I understand what you mean, i had taken it as the M671 command needed to match the commands in the bed.g
            ie the probe points but i have now updated the potions to match the actual lead screw position leveling seem to work better now but i need to run the leveling process twice as the first run did not adjust the offset correctly.

            output from the console.
            G32
            Leadscrew adjustments made: 1.999 1.920 3.028, points used 3, (mean, deviation) before (-0.548, 3.417) after (-0.000, 0.000)
            Leadscrew adjustments made: 0.057 -0.082 1.163, points used 3, (mean, deviation) before (-2.838, 3.845) after (0.000, 0.000)
            1/2/2021, 5:09:05 PM G32
            Leadscrew adjustments made: 1.166 1.972 2.849, points used 3, (mean, deviation) before (-0.292, 2.602) after (-0.000, 0.000)
            Leadscrew adjustments made: 0.115 -0.163 0.823, points used 3, (mean, deviation) before (-2.285, 3.068) after (0.000, 0.000)

            fcwiltundefined 1 Reply Last reply Reply Quote 0
            • fcwiltundefined
              fcwilt @A Former User
              last edited by fcwilt

              @CaLviNx said in Triple Z Axis G32 Bed Traming:

              @jay_s_uk said in Triple Z Axis G32 Bed Traming:

              @fcwilt or the kinematic mount positions

              That's a more accurate explanation

              @fcwilt some printers the lead screws only job is to move the axis, and they can also have pivots used to eliminate over constraining that axis

              That was not the point I was trying to make.

              My question dealt with how it was possible to probe the lead screw position (or the mount position).

              And as we now see the OP misunderstood what the parameters to M671 should have been.

              Frederick

              Printers: a E3D MS/TC setup and a RatRig Hybrid. Using Duet 3 hardware running 3.4.6

              1 Reply Last reply Reply Quote 0
              • fcwiltundefined
                fcwilt @Turricann
                last edited by

                @Turricann said in Triple Z Axis G32 Bed Traming:

                @fcwilt I understand what you mean, i had taken it as the M671 command needed to match the commands in the bed.g
                ie the probe points but i have now updated the potions to match the actual lead screw position leveling seem to work better now but i need to run the leveling process twice as the first run did not adjust the offset correctly.

                You still seem to be having a problem. On my printer two runs are always enough to get it spot on.

                Does a single G30 to set the Z=0 datum work as expected? If you move to Z=0 is the nozzle touching (or nearly so) the bed?

                Frederick

                Printers: a E3D MS/TC setup and a RatRig Hybrid. Using Duet 3 hardware running 3.4.6

                Turricannundefined 1 Reply Last reply Reply Quote 0
                • Phaedruxundefined
                  Phaedrux Moderator @Turricann
                  last edited by

                  @Turricann said in Triple Z Axis G32 Bed Traming:

                  G1 X0 Y0 F6000 ; go to first probe point
                  G30 ; use probe to find Z 0

                  The position of the probe for the G30 should match between homez and homeall (and any other place you are setting Z0)

                  Z-Bot CoreXY Build | Thingiverse Profile

                  Turricannundefined 1 Reply Last reply Reply Quote 0
                  • Turricannundefined
                    Turricann @fcwilt
                    last edited by

                    @fcwilt

                    Doing a single G30 probes the bed @X0, Y0(Bed center), Doing a G1 Z0 the nozzle moves so its touching the bed.

                    fcwiltundefined 1 Reply Last reply Reply Quote 0
                    • Turricannundefined
                      Turricann @Phaedrux
                      last edited by

                      @Phaedrux I see i had not set the probe offset, however the bed is still not tramming correctly any other thoughts ?

                      1 Reply Last reply Reply Quote 0
                      • fcwiltundefined
                        fcwilt @Turricann
                        last edited by

                        @Turricann said in Triple Z Axis G32 Bed Traming:

                        @fcwilt

                        Doing a single G30 probes the bed @X0, Y0(Bed center), Doing a G1 Z0 the nozzle moves so its touching the bed.

                        Thanks.

                        Seems like your Z probe is configured and working correctly.

                        Perhaps the following may help:

                        I don't do multiple passes in my bed.g - just one. And I also end the bed.g processing with setting the Z=0 datum at the center of the bed.

                        I obtain multiple passes by ending my homez.g file with two G32 commands.

                        Frederick

                        Printers: a E3D MS/TC setup and a RatRig Hybrid. Using Duet 3 hardware running 3.4.6

                        Turricannundefined 1 Reply Last reply Reply Quote 0
                        • Turricannundefined
                          Turricann @fcwilt
                          last edited by

                          @fcwilt

                          I have changed the M671 leadscrew Positions from where the leadscrews are to the pivot points under the bed as in @CaLviNx config.g example.

                          The bed leveling now seems more consistant,
                          1/2/2021, 9:51:43 PM G32
                          Leadscrew adjustments made: 0.291 0.320 0.311, points used 3, (mean, deviation) before (0.307, 0.010) after (-0.000, 0.000)
                          1/2/2021, 9:50:43 PM G32
                          Leadscrew adjustments made: 0.307 0.299 0.307, points used 3, (mean, deviation) before (0.305, 0.004) after (-0.000, 0.000)
                          1/2/2021, 9:49:43 PM G32
                          Leadscrew adjustments made: 0.308 0.294 0.297, points used 3, (mean, deviation) before (0.300, 0.005) after (-0.000, 0.000)

                          fcwiltundefined 2 Replies Last reply Reply Quote 0
                          • fcwiltundefined
                            fcwilt @Turricann
                            last edited by

                            @Turricann said in Triple Z Axis G32 Bed Traming:

                            @fcwilt

                            I have changed the M671 leadscrew Positions from where the leadscrews are to the pivot points under the bed as in @CaLviNx config.g example.

                            The bed leveling now seems more consistant,
                            1/2/2021, 9:51:43 PM G32
                            Leadscrew adjustments made: 0.291 0.320 0.311, points used 3, (mean, deviation) before (0.307, 0.010) after (-0.000, 0.000)
                            1/2/2021, 9:50:43 PM G32
                            Leadscrew adjustments made: 0.307 0.299 0.307, points used 3, (mean, deviation) before (0.305, 0.004) after (-0.000, 0.000)
                            1/2/2021, 9:49:43 PM G32
                            Leadscrew adjustments made: 0.308 0.294 0.297, points used 3, (mean, deviation) before (0.300, 0.005) after (-0.000, 0.000)

                            Did you try adding the G30 in your bed.g file to set the Z=0 datum after the leveling phase?

                            Your bed seems level but has a Z offset.

                            Frederick

                            Printers: a E3D MS/TC setup and a RatRig Hybrid. Using Duet 3 hardware running 3.4.6

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                            • fcwiltundefined
                              fcwilt @Turricann
                              last edited by

                              @Turricann said in Triple Z Axis G32 Bed Traming:

                              I have changed the M671 leadscrew Positions from where the leadscrews are to the pivot points under the bed as in @CaLviNx config.g example.

                              @dc42 - is that the correct way to set M671 for printers with kinematic mounts?

                              Thanks.

                              Frederick

                              Printers: a E3D MS/TC setup and a RatRig Hybrid. Using Duet 3 hardware running 3.4.6

                              A Former User? jay_s_ukundefined 2 Replies Last reply Reply Quote 0
                              • A Former User?
                                A Former User @fcwilt
                                last edited by

                                @fcwilt said in Triple Z Axis G32 Bed Traming:

                                @Turricann said in Triple Z Axis G32 Bed Traming:

                                I have changed the M671 leadscrew Positions from where the leadscrews are to the pivot points under the bed as in @CaLviNx config.g example.

                                @dc42 - is that the correct way to set M671 for printers with kinematic mounts?

                                Thanks.

                                Frederick

                                Sigh, this is yet another reason I add a disclaimer....

                                1 Reply Last reply Reply Quote -1
                                • jay_s_ukundefined
                                  jay_s_uk @fcwilt
                                  last edited by

                                  @fcwilt I would've thought gloomyandys answer was sufficient

                                  Owns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF. Assume I'm running whatever the latest beta/stable build is

                                  fcwiltundefined 1 Reply Last reply Reply Quote 0
                                  • fcwiltundefined
                                    fcwilt @jay_s_uk
                                    last edited by

                                    @jay_s_uk said in Triple Z Axis G32 Bed Traming:

                                    @fcwilt I would've thought gloomyandys answer was sufficient

                                    Why?

                                    dc42 did the code - who knows if these special cases were taken into account or if it even matters.

                                    Even though I have kinetic mounts specifying the position of the leadscrews works fine.

                                    Frederick

                                    Printers: a E3D MS/TC setup and a RatRig Hybrid. Using Duet 3 hardware running 3.4.6

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

                                      @fcwilt said in Triple Z Axis G32 Bed Traming:

                                      who knows if these special cases were taken into account or if it even matters.

                                      It's an approximation of location at any rate, since you're trying to approach zero, the farther off your estimate is, the longer it takes to reach. It says the position of lead screws, but that's just an assumption that most people will have printers with lead screws and won't have specifically designed pivot points, in which case, the lead screw is the natural pivot point. So technically, M671 is defining the pivot point, but in practice that's most commonly going to be a lead screw, and even more practically, it doesn't matter so much as long as you're "pretty close".

                                      Z-Bot CoreXY Build | Thingiverse Profile

                                      fcwiltundefined 1 Reply Last reply Reply Quote 1
                                      • fcwiltundefined
                                        fcwilt @Phaedrux
                                        last edited by

                                        @Phaedrux said in Triple Z Axis G32 Bed Traming:

                                        It's an approximation of location at any rate...

                                        Thanks for the feedback. It is consistent with my experiences.

                                        Frederick

                                        Printers: a E3D MS/TC setup and a RatRig Hybrid. Using Duet 3 hardware running 3.4.6

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