My scale is off by a factor of 5?

Hello,

I have just assembled my motors lead screw and sheaves
- motor 600 oz in nema 34 - ?200 steps per rev?
machmotion.com/cnc-products/drives-motor...n-stepper-motor.html
- motor sheave 72 notches
- lead screw sheave 32 notches
- lead screw 3/4-6 acme

I calculated this to be 0.0018" per step, PnCConf confirmed this under scale setup.
but when I try to test the setup it is nearly 1/5 of what it should be? ie if i tell it to go 10 inches it will go 2

Any Ideas?

Thanks for looking.

what kind of step drive and what are its settings?

Its a gecko 203v with no resistor (7Amp)

doesn't gecko do micro stepping? if it does 5 time micro stepping then the scale would be wrong.

hmm gecko 203 does 10 x microstepping.
you need to account for that.
Inches per step would be .0001875
but the scale is what is important.
What scale did pncconf give you ? 5333.3333

But one would expect it to be 1/10 of distance rather then 1/5th - I wonder if something else is happening too...

It gives me a scale of 533.3333333

then it seems you forgot to account for the micro stepping.
the gecko multiplies the 200 steps the motor has by 10.

after fixing the scale it looks to be much closer now, thanks!