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Z motor steps calibration

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  • undefined
    Touchthebitum
    last edited by 11 Aug 2020, 19:02

    Hello
    I'm a bit confused with the Z Motor steps per mm calibration.
    I'm using RRF configurator and when I try to set up the correct steps for the 8mm leadscrew, I only get 1.25mm as pitch possibility.
    If I see the specs of this leadscrew, it is 2mm ....
    What would be the correct setting ?
    Thanks

    Sparkcube XL V 1.1 300x300x190, Radds, Raspberry, Keenovo silicone bedheat 220v, Big Booster Extruder, DIY building
    BLV Cube 665mm Direct Drive with Duet3/SBC (RPi 4) Mosquito Magnum/Bond Tech Extruder/Vanadium Nozzle, Keenovo silicone bedheat 220v

    undefined 1 Reply Last reply 11 Aug 2020, 19:21 Reply Quote 0
    • undefined
      baird1fa @Touchthebitum
      last edited by 11 Aug 2020, 19:21

      @Touchthebitum you will want to take the number of steps per revolution and divide by 2. Since your axis will travel 2mm for every revolution. If you have a 0.9 degree stepper and are not using any microstepping then you would set it to 200 (because 400/2) But I suspect you are using some amount of microsteps the number will be much larger. So take the 400 and multiply it by the microsteps, say for example 64 microsteps then it becomes (400*64)/2 = 12,800.

      Hope that helps.

      undefined 1 Reply Last reply 11 Aug 2020, 19:30 Reply Quote 0
      • undefined
        Touchthebitum @baird1fa
        last edited by 11 Aug 2020, 19:30

        @baird1fa
        Thanks
        So if I understand correctly, I would have this ?

        Inkedsteps_LI.jpg

        Sparkcube XL V 1.1 300x300x190, Radds, Raspberry, Keenovo silicone bedheat 220v, Big Booster Extruder, DIY building
        BLV Cube 665mm Direct Drive with Duet3/SBC (RPi 4) Mosquito Magnum/Bond Tech Extruder/Vanadium Nozzle, Keenovo silicone bedheat 220v

        undefined 1 Reply Last reply 11 Aug 2020, 19:31 Reply Quote 0
        • undefined
          Phaedrux Moderator @Touchthebitum
          last edited by 11 Aug 2020, 19:31

          @Touchthebitum That looks correct based on the formula for lead screw axis:

          Z_steps_per_mm = (motor_steps_per_rev * driver_microstep) / screw_lead

          Z-Bot CoreXY Build | Thingiverse Profile

          undefined 1 Reply Last reply 11 Aug 2020, 19:34 Reply Quote 0
          • undefined
            Touchthebitum @Phaedrux
            last edited by 11 Aug 2020, 19:34

            @Phaedrux

            Thanks
            Does a leadscrew 8mm (M8) with a 1.25mm pitch exists ?
            I don't see anything like this on the net...

            Sparkcube XL V 1.1 300x300x190, Radds, Raspberry, Keenovo silicone bedheat 220v, Big Booster Extruder, DIY building
            BLV Cube 665mm Direct Drive with Duet3/SBC (RPi 4) Mosquito Magnum/Bond Tech Extruder/Vanadium Nozzle, Keenovo silicone bedheat 220v

            undefined 1 Reply Last reply 11 Aug 2020, 19:36 Reply Quote 0
            • undefined
              droftarts administrators @Touchthebitum
              last edited by droftarts 8 Nov 2020, 19:39 11 Aug 2020, 19:36

              @Touchthebitum standard 8mm threaded rod has a thread pitch of 1.25mm. Was heavily used in the ‘old’ RepRap days!

              Ian

              Bed-slinger - Mini5+ WiFi/1LC | RRP Fisher v1 - D2 WiFi | Polargraph - D2 WiFi | TronXY X5S - 6HC/Roto | CNC router - 6HC | Tractus3D T1250 - D2 Eth

              undefined 1 Reply Last reply 11 Aug 2020, 19:38 Reply Quote 0
              • undefined
                Touchthebitum @droftarts
                last edited by 11 Aug 2020, 19:38

                @droftarts

                Thanks for the info 😉

                Sparkcube XL V 1.1 300x300x190, Radds, Raspberry, Keenovo silicone bedheat 220v, Big Booster Extruder, DIY building
                BLV Cube 665mm Direct Drive with Duet3/SBC (RPi 4) Mosquito Magnum/Bond Tech Extruder/Vanadium Nozzle, Keenovo silicone bedheat 220v

                1 Reply Last reply Reply Quote 0
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