Re: [CAD_CAM_EDM_DRO] PIC DRO stupid question #2

----- Original Message -----
From: "Jon Elson" <jmelson@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
Sent: Thursday, April 06, 2000 10:42 PM
Subject: Re: [CAD_CAM_EDM_DRO] PIC DRO stupid question #2
> >
> > There may be a space limitation on this hypothetical kluge. I was
> > wondering what happens if you used say 3 of the 360 line strips,
> > mounted them
> > side by side, each 1/3 of a division offset from the previous. I
> > don't have
> > the signaling worked out but could it not give you much finer
> > resolution?

There was an article in last months machine design mag that sounded
something like
this [http://www.machinedesign.com]
they used a "tilted array" of sensors reading a single strip like so
< strip >
| *| | l
| * | | i
| * | | n
|* | | e

each sensor tripps a schmitt trigger as it passes over the edge of a line
each trigger fires off a one shot pulse
the pulses are combined with an n-input OR gate and the pulse train from the
OR gate
is sent to a counter
to simulate a quadrature signal they add a second array offset from the
first.
the sensors wouldnt have to be reading the same line they just have to tripp
in
sequence

Brian