Re: [CAD_CAM_EDM_DRO] Digest Number 2937 - Steps per inch

At 07:59 PM 2/15/03 -0800, you wrote:

>However when I measured the travel (at several places along the axis) using
>MDI commands my dial indicator repeatedly indicated that 16070 steps were
>necessary to get 1 inch of travel. Similar experience (slightly different
>numbers) on the other axis. Does this sound reasonable or do I have
>something to track down? And what might it be?

Well, if you have mismatch there, either you're losing steps, or your
screws indeed do have an error, or your dial gauge has an error. I'll bet
on the screws.

With Axis Wizard, you set up the overall ratio of steps to distance by
entering drive ratio, steps/rev and screw pitch. The one number resulting
is used to convert all input data to steps, which are what's issued to
motors. To display distance in terms of inch, metric or steps, the routine
that reads that out simply divides number of steps traveled by the constant
needed. Works just fine.

Regards, Hoyt McKagen


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