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    Homing crashes

    Scheduled Pinned Locked Moved
    Tuning and tweaking
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    • fcwiltundefined
      fcwilt @trublu89
      last edited by

      @trublu89

      Why do you have a Y move in your X homing code?

      Why do you have a X move in your Y homing code?

      Frederick

      Printers: A FT-5 with the 713 upgrade bits, a custom MarkForged style, a small Utilmaker style, a small CoreXY from kit and a E3D MS/TC setup. Various hotends. Using Duets (2 and 3) running 3.4.6

      trublu89undefined 1 Reply Last reply Reply Quote 0
      • trublu89undefined
        trublu89 @fcwilt
        last edited by

        @fcwilt
        I home to the front left corner. If I home y without moving I will strike the z axis lead screw or fan.

        fcwiltundefined 1 Reply Last reply Reply Quote 0
        • fcwiltundefined
          fcwilt @trublu89
          last edited by

          @trublu89 said in Homing crashes:

          @fcwilt
          I home to the front left corner. If I home y without moving I will strike the z axis lead screw or fan.

          That suggests your axis limits may be wrong. You should not have to worry about the position of Y when homing X or the position of X when homing Y.

          Could you post one or more pictures show what the problem is?

          Frederick

          Printers: A FT-5 with the 713 upgrade bits, a custom MarkForged style, a small Utilmaker style, a small CoreXY from kit and a E3D MS/TC setup. Various hotends. Using Duets (2 and 3) running 3.4.6

          trublu89undefined 1 Reply Last reply Reply Quote 0
          • trublu89undefined
            trublu89 @fcwilt
            last edited by

            @fcwilt
            20220501_124548.jpg

            Attached is where I home to. So I should move my limit switches?

            fcwiltundefined 1 Reply Last reply Reply Quote 0
            • fcwiltundefined
              fcwilt @trublu89
              last edited by

              @trublu89

              Wow, that is a lot of hardware in the way.

              Do the axis min/max setting prevent hitting that lead screw during normal printing operations?

              I don't know what the best solution is for you. Just for reference my endstop sensors are all positioned so there is no risk of hitting other parts of the printer during homing.

              One possibility would be to re-design the extruder mount to use a Zesty Nimble remote drive extruder. This system puts the stepper on the frame and drives the geared extruder via a flexible cable.

              Here is one of my printers using a Nimble. On this printer to reduce the strain on the drive cable the stepper is mounted on a gimbal but that is optional.

              MF1 Overview.png

              Frederick

              Printers: A FT-5 with the 713 upgrade bits, a custom MarkForged style, a small Utilmaker style, a small CoreXY from kit and a E3D MS/TC setup. Various hotends. Using Duets (2 and 3) running 3.4.6

              trublu89undefined 1 Reply Last reply Reply Quote 0
              • trublu89undefined
                trublu89 @fcwilt
                last edited by

                @fcwilt
                I'm kinda stuck with what I have right now. Maybe I can reduce the size of the bed by moving y back. That should clear hitting the fan or lead screw.

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                • fcwiltundefined
                  fcwilt @trublu89
                  last edited by

                  @trublu89 said in Homing crashes:

                  @fcwilt
                  I'm kinda stuck with what I have right now. Maybe I can reduce the size of the bed by moving y back. That should clear hitting the fan or lead screw.

                  I have had to re-position the bed during printer design to resolve problems like yours.

                  Frederick

                  Printers: A FT-5 with the 713 upgrade bits, a custom MarkForged style, a small Utilmaker style, a small CoreXY from kit and a E3D MS/TC setup. Various hotends. Using Duets (2 and 3) running 3.4.6

                  trublu89undefined 1 Reply Last reply Reply Quote 0
                  • trublu89undefined
                    trublu89 @fcwilt
                    last edited by

                    @fcwilt
                    Originally it was a 3 lead screw system but the weight causes it to fall so I recently added the fourth and haven't been able to begin calibrating of dialing in the 1.2 nozzle.

                    fcwiltundefined 1 Reply Last reply Reply Quote 0
                    • fcwiltundefined
                      fcwilt @trublu89
                      last edited by

                      @trublu89 said in Homing crashes:

                      @fcwilt
                      Originally it was a 3 lead screw system but the weight causes it to fall so I recently added the fourth and haven't been able to begin calibrating of dialing in the 1.2 nozzle.

                      What was the lead of the lead screws?

                      There are a number of solutions to beds that fall that don't involve adding another lead screw.

                      One is using lead screws with a smaller lead. A common lead is 8mm but you can purchase lead screws with 4, 2 or 1. But you can run into speed problems with small leads.

                      Another is using a geared stepper motor or a pair of pulleys to obtain the same result, such as a 20 tooth pulley driving a 100 tooth pulley.

                      On the printer I posted I used stepper motors with integral 5:1 planetary gear boxes and the bed stays put as needed.

                      Frederick

                      Printers: A FT-5 with the 713 upgrade bits, a custom MarkForged style, a small Utilmaker style, a small CoreXY from kit and a E3D MS/TC setup. Various hotends. Using Duets (2 and 3) running 3.4.6

                      trublu89undefined 1 Reply Last reply Reply Quote 0
                      • trublu89undefined
                        trublu89 @fcwilt
                        last edited by

                        @fcwilt the standard 8mm from open builds.

                        I had a stepper motor with gearbox never thought to use that.

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