My scale is off by a factor of 5?

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19 Apr 2012 16:43 #19377 by vladilinsky
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.

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19 Apr 2012 18:07 #19378 by PCW
what kind of step drive and what are its settings?

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19 Apr 2012 18:21 #19379 by vladilinsky
Its a gecko 203v with no resistor (7Amp)

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20 Apr 2012 00:22 #19381 by cmorley
doesn't gecko do micro stepping? if it does 5 time micro stepping then the scale would be wrong.

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20 Apr 2012 00:51 #19382 by cmorley
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...

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20 Apr 2012 01:21 #19384 by vladilinsky
It gives me a scale of 533.3333333

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21 Apr 2012 05:06 #19412 by cmorley
then it seems you forgot to account for the micro stepping.
the gecko multiplies the 200 steps the motor has by 10.

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22 Apr 2012 15:00 - 22 Apr 2012 15:00 #19435 by vladilinsky
after fixing the scale it looks to be much closer now, thanks!
Last edit: 22 Apr 2012 15:00 by vladilinsky.

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