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    Triple Z Axis G32 Bed Traming

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    • 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

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      • 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 ?

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              • 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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