Steps Per Revolution Issue?

TLAS

Sorry, I really think this should be easy.

5mm pitch ballscrew
200 steps per revolution motor

equals 40 steps per mm.

But when I'm running the Duet, I'm off by a factor of ~15 (likely 16). When it's supposed to move 5mm, it actually takes 75ish for a full rotation.

I don't have any microstepping enabled in the firmware.

; Axis and motor configuration
M569 P0 S1 ; Drive 0 goes forwards
M569 P1 S1 ; Drive 1 goes forwards
M569 P2 S1 ; Drive 2 goes forwards
M569 P3 S1 ; Drive 3 goes forwards
M569 P4 S1 ; Drive 4 goes forwards

; Motor Calibrations
M92 X40 Y40 Z40 ; Set axis steps/mm
M906 X2000 Y2000 Z2000 E2000 I60 ; Set motor currents (mA) and increase idle current to 60%
M201 X500 Y500 Z500 E500 ; Accelerations (mm/s^2)
M203 X1000 Y1000 Z1000 E3600 ; Maximum speeds (mm/min)
M566 X500 Y500 Z500 E1200 ; Maximum instant speed changes mm/minute

Any thoughts? Seems like this should be a simple one.

tomasf

Are you sure you don't have microstepping enabled? IIRC, the default is 16x. You might want to try something like [c]M350 X1 Y1 Z1[/c] to explicitly turn it off.

dc42

The steps/mm in the M92 command is the number of microsteps per mm. I know this isn't logical, but it's how 3D printing has always been. The default microstepping is 16x with interpolation, unless you change it using the M350 command.

TLAS

Ah, that would explain it, thanks.