# Thread: Mach 3 motor tuning

1. ## Mach 3 motor tuning

Hey, just replaced a lead screw and i'm trying to figure out what my steps per mm need to be.

motors are set to 200 steps per rev. my driver board is set to 1/8steps.

i always have trouble figuring this out.

thanks

2. Originally Posted by corneliusbrown
Hey, just replaced a lead screw and i'm trying to figure out what my steps per mm need to be.

motors are set to 200 steps per rev. my driver board is set to 1/8steps.

i always have trouble figuring this out.

thanks
Well I haven't done this for awhile but lets give it a shot..

200 steps x 8 equals 1600 steps per revolution.
1 rev will take you .1 inch

to go 10 inches you want 10x1600 or 16000 steps.

10 inches =254 mm
254mm = 16000 steps

mm = 16000/254
mm = 62.992126

Close?
Garry

3. ## Thanks

Hey- very close i figured it out and its actually 629.xxxxx

thanks though

4. He missed a 0.

to go 10 inches you want 100x1600 or 160000 steps.

254mm = 160,000 steps.

5. Originally Posted by ger21
He missed a 0.

to go 10 inches you want 100x1600 or 160000 steps.

254mm = 160,000 steps.
So obvious
After I come back to it....