RE: [CAD_CAM_EDM_DRO] Microstepping

PJ, micro stepping drives move the motor in increments smaller than the
1.8 degrees listed. For example a 1/2 step drive would only move the
motor .9 of a degree per input pulse. In the case of the gecko's there
are 10 steps needed to move the motor the listed 1.8 degrees. The
purpose of this, I believe is to make the motor run / step much
smoother.
One of the drawbacks is that you need 10 times as many step pulses from
your computer to move the same distance. A lot of printer port based
controllers / programs have a finite ( limited) number of steps per
second ( often around 8000) so after lead / ball screw, reduction
pulleys etc your stepper motor system would crawl along. Mariss at
Gecko sells a daughter board or a driver with the daughter board built
in that "multiply" x 10, 5, 2, or 1 the pulses that you input, so that
in the end you can get back to where you started, i.e. one step in can
move the motor as much as 1.8 degrees again, albeit in up to 10 very
small steps.

Hope this helps.


-----Original Message-----
From: P. J. Hicks [mailto:hickspj467@...]
Sent: Saturday, November 30, 2002 1:38 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Microstepping


Hi,
Another newbie question.

I see 'full step', 'half step', 'quarter step', and 'eighth step'
mentioned at various times. If the stepper motor moves for example, 1.8
deg/pulse (step) for each pulse (step) put out from the PC parallel port
how does the motor move 1/2 or 1/4 or 1/8 steps? Or does it move 2, 4,
or 8 steps? Or is the controller able to manipulate the motor windings
to get multiple steps OR partial steps for each step output by the PC?
Then how is the above effected by parallel/series windings connection?

Computer says move one step; does motor see 1, 2, 4, or 8 steps OR sees
1, 1/2, 1/4, 1/8 step? How? PJH

[Non-text portions of this message have been removed]


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