[Collins] R390A Oldham coupler assembly dimensions wanted

[Dr. Gerald N. Johnson]

On Thu, 2008-06-19 at 23:25 -0700, Chris Kepus wrote:
> Is there any "connection" to be noted here..??   For example, would an Old
> Ham use an Oldham coupler?  It's late and wandering minds want to know.
> 
Being that I approach being an old ham, (licensed nearly 53 years) I'd
consider an oldham coupler in some situations, but those situations
would require both shafts to be anchored axially so the center disk of
the coupler invented by some one named Oldham would be kept in place.
For my projects, I might tend to think of a Millen (if I had a
sufficient supply in my parts collection) molded insulated flexible
coupling or a WW2 surplus ceramic insulated coupling from a BC-375
tuning unit. or if all I needed was shaft extension I might use a simple
brass shaft coupler and take care to line up the shafts. The beauty of
an Oldham coupler is that it smoothly takes care of shafts that are
nearly parallel and not quite aligned. It allows for offset and a little
bend. If my supply permitted and the transmitted torque admitted, I
might even use an Oldham coupling in my parts collection with a nylon
center washer. Providing the shafts had constraint so they couldn't
slide apart and I thought the nylon insulator could handle the applied
voltage.
-- 
73, Jerry, K0CQ, Technical Advisor to the CRA
All content copyright Dr. Gerald N. Johnson, electrical engineer