Re: [CAD_CAM_EDM_DRO] cdrom

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.