[Collins] R390A Oldham coupler assembly dimensions wanted

[DW Holtman]

Hello,

Isn't a bellows coupler used on the BFO linkage?

Best,
DW Holtman
WB7SSN

----- Original Message ----- 
From: "Dr. Gerald N. Johnson" <geraldj at storm.weather.net>
To: <collins at mailman.qth.net>
Sent: Thursday, June 19, 2008 6:39 PM
Subject: Re: [Collins] R390A Oldham coupler assembly dimensions wanted


> 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
>
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