[Collins] R390A Oldham coupler assembly dimensions wanted

[Dr. Gerald N. Johnson]

On Thu, 2008-06-19 at 05:27 -0600, DW Holtman wrote:
> Cal,
> 
> As far as sourcing goes, McMaster-Carr sells a line of Oldham couplers. They 
> are not identical, but will work to couple a PTO. Type Oldham coupler in 
> their search engine.
> 
> http://www.mcmaster.com/
> 
> Best,
> DW Holtman
> WB7SSN

Its entirely possible that the original Oldham coupling was a purchased
assembly, not made by Collins or the other 390A vendors.

Looking through the selection of couplings in the McMaster-Carr catalog
I wondered if maybe a bellows coupling would have been used had it been
an option when the 390A was designed. It would have required a larger
gap between the shaft ends than the Oldham coupling though. I don't know
of any reason that could not have been accomplished simply by shortening
the two shafts and leaving a bit more room in that area of the gear
train.
-- 
73, Jerry, K0CQ, Technical Advisor to the CRA
All content copyright Dr. Gerald N. Johnson, electrical engineer