Newsgroups: comp.robotics
From: sfp@mpeltd.demon.co.uk (Stephen Pelc)
Path: cantaloupe.srv.cs.cmu.edu!rochester!cornellcs!travelers.mail.cornell.edu!news.tc.cornell.edu!news.cac.psu.edu!news.pop.psu.edu!hudson.lm.com!godot.cc.duq.edu!news.duke.edu!agate!howland.reston.ans.net!pipex!peernews.demon.co.uk!mpeltd.demon.co.uk!sfp
Subject: Re: How Do I Get .045 Degree Stepping?
References: <3lc6gh$nf0@sol.sun.csd.unb.ca> <wpenrose.14.0014F57C@interaccess.com>
Organization: MicroProcessor Engineering Ltd
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In article <3lc6gh$nf0@sol.sun.csd.unb.ca> lewcobb@jupiter.sun.csd.unb.ca
 (Lewis Cobb External) writes:

>Hi - How does a person go about getting oh, say 0.045 degree stepping
>of a shaft from a stepper motor system?  

It is possible to improve the resolution of a stepper motor by
"microstepping". Instead of turning off the current to one coil,
and turning on the current to the next, the currents are changed
in small steps.

In your case, 16 or 32 steps may be enough. Some controller chips
will permit fine control of the stepper current. Sorry not to be
able to give more details, I have been out of stepper motor control
for a while now.
-- 
Stephen Pelc, sfp@mpeltd.demon.co.uk
MicroProcessor Engineering - More Real, Less Time
133 Hill Lane, Southampton SO15 5AF, England
tel: +44 1703 631441, fax: +44 1703 339691
