Stepper motor settings



  • Another newbie question

    Do these numbers look sort of right for standard nema 17 steppers 1.8 deg
    The currents are set just below there maximum rating
    The X,Y,Z are v typical 1.8 deg steppers
    The extruder motor is a 0.9 deg ( the stepper for the E3D titan extruder )
    printer is an old formbot raptor , cartesian style .

    The M92 z4000 seems very high .

    I sort of get the meaning of the various lines but I dont know what is normal or at least expected ( ish )

    many thanks

    Drives
    M569 P0 S1 ; Drive 0 goes forwards
    M569 P1 S0 ; Drive 1 goes forwards
    M569 P2 S1 ; Drive 2 goes forwards
    M569 P3 S0 ; Drive 3 goes backwards
    M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
    M92 X80 Y80 Z4000 E420 ; Set steps per mm
    M566 X900 Y900 Z12 E120 ; Set maximum instantaneous speed changes (mm/min)
    M203 X6000 Y6000 Z180 E1200 ; Set maximum speeds (mm/min)
    M201 X500 Y20 Z250 E250 ; Set accelerations (mm/s^2)
    M906 X1600 Y1600 Z1250 E800 I30 ; Set motor currents (mA) and motor idle factor in per cent
    M84 S30 ; Set idle timeout


  • administrators

    • 1600mA for X and Y in your M906 command is unusually high for a small 3D printer
    • M92 Z4000 is correct if the Z axis uses a screw with a pitch of 0.8mm.
    • M201 X500 Y20 Z250 E250 looks wrong, I suspect you have the Y and Z values swapped


  • thanks , i have put them in and altered the amps to 1000



  • You may find this of interest to you, particularly the section on finding your steps per MM: https://duet3d.dozuki.com/Wiki/Going_from_Marlin_on_Arduino_to_RepRapFirmware_on_Duet

    I agree that 4000 for the Z axis seems a little arbitrary.


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