Z screw settings not correct corexy

  • I asked the supplier about the z screws. They told me 8mm 2mm pitch. When printing the z seems to jump too high each layer. Not sure what the settings should be based on that.
    Duet 3 rrf3.1.1

    ; Drives
    M569 P0.0 S0 ; physical drive 0.0 goes forwards
    M569 P0.1 S1 ; physical drive 0.1 goes forwards
    M569 P0.2 S1 ; physical drive 0.2 goes backwards
    M569 P0.3 S1 ; physical drive 0.3 goes forwards
    M584 X0.0 Y0.1 Z0.2 E0.3 ; set drive mapping
    M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
    M92 X80.00 Y80.00 Z400.00 E415.00 ; set steps per mm
    M566 X900.00 Y900.00 Z12.00 E120.00 ; set maximum instantaneous speed changes (mm/min)
    M203 X9000.00 Y9000.00 Z480.00 E3600.00 ; set maximum speeds (mm/min)
    M201 X2500.00 Y2500.00 Z20.00 1000.00 ; set accelerations (mm/s^2)
    M906 X800 Y800 Z800 E800 I30 ; set motor currents (mA) and motor idle factor in per cent
    M84 S30 ; Set idle timeout

    Drives section of config.g

  • Moderator

    Do they have an 8mm lead or a 2mm lead?

    You'll need to know that to find the correct steps per mm using this:

    Z_steps_per_mm = (motor_steps_per_rev * driver_microstep) / screw_lead

  • This post is deleted!

  • Pitch=2mm,Lead=8mm This is what I was told by them. So I was wrong

  • Moderator

    Well we've got two options to test. Do the calculations with 2 and test the steps per mm of that doesn't work test with 8. Even vendors get lead and pitch confused so best to test.

  • Ok. How do I test it ? Based on the amount of movement ?

  • Moderator

    Yeah. You can force the z axis position using g92 z0. Then use the jog buttons in the web interface to move it and measure the distance moved with a ruler.

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