Re: Encoders

----- Original Message -----
From: Jon Elson <jmelson@...>
To: <CAD_CAM_EDM_DRO@onelist.com>
Sent: Tuesday, June 29, 1999 12:31 AM
Subject: Re: [CAD_CAM_EDM_DRO] Encoders


> From: Jon Elson <jmelson@...>
>
>
>
> TADGUNINC@... wrote:
>
> > From: TADGUNINC@...
> >
> > Another quick question,
> > I have several older commercial printers, is there any way to
determine
> > the number of slots, cpr? I have a scope and a means of powering them
up.
>
> If these encoders have an index pulse, you hook a counter with a ratio
counting
> function to the index and one of the quadrature channels, and rotate it
smoothly.
> It doesn't have to be constant speed. It will show the cycles / rev.
> With a scope, use the index channel, or rig up a homemade one that gives
> one pulse per rev. Attach a motor, and spin at constant speed. use the
scope
> to time the index period, then time the period of a quadrature channel.
> Divide index period by quad period, that should be the cycles/rev.
> 4 times that would be the quadrature counts / rev.
>
> Jon
>
>
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