Re: mouse encoder?

Another thing you can do is use a cad program, use a circular array
command to make your disk artwork. Convert to a .bmp or .jpeg and
have a photo shop shoot it to a lithographic negative. Just cut out
the disc and center it. Instant encoder wheel.

Use the same technique to generate the stationary grating (0 and 90
degree offset channels for a quadrature encoder). Add an LED and
photo-transistor per channel for a home-brew encoder. A 2" dia. wheel
can yeild an easy to align 1,000 line (4,000 count) encoder.

Mariss

--- In CAD_CAM_EDM_DRO@y..., "Smoke" <gordonr@r...> wrote:
> I would presume that. Just build a head able to read the number of
slots
> you put in the disk. Shouldn't be too difficult. I remember seeing
> circuits for that back in '75 when I was in electronics/computer
school.
>
> Smoke
>
>
>
> >You can make all the disks you want, but the encoder read head has
to
> >match the disk to generate quadrature output properly. The people
at US
> >Digital told me that you are OK up to about a 10% variation from
the
> >designed count for a particular head.
> >
> >Tim
> >[Denver, CO]
> >
> >> -----Original Message-----
> >>
> >> Why use a 1/16 end mill. Use something much smaller (say .01
> >> dia.) and you can do a whole lot more slots (about 450+ on a
> >> 3 inch disk).
> >>
> >> Smoke
> >>
> >> >Nothing to stop you from making your own discs if you have a
> >> suitably
> >> >small end mill. I made a 60-slot disc for RPM measurement
> >> using a 1/6"
> >> >end mill & the 3" diam platter from a defunct hard drive -
worked a
> >> >treat.
> >>
> >>
> >> Addresses:
> >> FAQ: http://www.ktmarketing.com/faq.html
> >> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> >
> >
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