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

Looks like you have about 0.0045" (72 steps) of backlash.

Daniel J. Statman, Statman Designs
www.statmandesigns.com
dan.statman@...

----- Original Message -----
From: "P. J. Hicks" <hickspj467@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, February 15, 2003 10:59 PM
Subject: [CAD_CAM_EDM_DRO] Digest Number 2937 - Steps per inch


> In following the discussion on calculation vs. trial and error setting of
> the spi I would like to relate my experience and ask if it makes sense or
is
> way out of line.
>
> I initially set the spi by calculation; sherline supplied standard lead
> screws 20 tpi X 200 steps per motor revolution X 4x stepping equals 16000
> steps per inch, Correct?
>
> 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?
>
> PJH
>
>
>
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