Re: [CAD_CAM_EDM_DRO] cdrom

This is exactly what Shooting Star Technology is doing: a rack and a
matching gear attached to a rotary encoder. Web site:
www.star-techno.com They use 2000 counts/revolution on their encoders
and advertise .00005 inch resolution. The rack is protected by
corrugated plastic.

George

ptengin@... wrote:

>
> From: ptengin@...
>
> In a message dated 03/16/2000 4:06:10 PM Hawaiian Standard Time,
> lowther@... writes:
>
> << From: Ken Lowther <lowther@...>
>
> Someone on the ATM list floated the idea of making encoder disks out of
> cdroms. Of course it would be rotary. >>
> I'm just throwing this in. Make a ruggedized version of a dial caliper.
> Attach to a machine axis. Instead of a needle and dial, equip with a rotary
> encoder. I know there is some lash problems to be solved but just a slightly
> more durable version of a dial caliper should work. If the rack is placed
> under a shroud, it should stay fairly clean. The rack would ensure
> repeatability. Seems it could be built with enough step up so that good
> resolution is achievable. Just need a source of 64 pitch rack.
>
> Peter
> THRD, Inc.
>