"Winston" wrote in message
news:mnF8k.42$4J.20@trnddc05...
Tom Gardner wrote:
I want to turn a 4" OD x 3/8" thick gear 80 to 110 degrees in 100 ms.

(...)

Are you converting from linear to rotary to linear motion?
How about just an overrruning clutch and pinch roller mounted on the end of
your
air cylinder shaft? Less mass. Fewer parts. Cheaper.

--Winston

You have amazing vision, that's exactly what I want to replace, it's not
tolerant of hard/soft/dry/oily wire.