[Fwd: Re: [Collins] R390A Oldham coupler assembly dimensions wanted]

[Dr. Gerald N. Johnson]

-------- Forwarded Message --------
> From: Dr. Gerald N. Johnson <geraldj at storm.weather.net>
> Reply-To: geraldj at storm.weather.net
> To: catman351 at yahoo.com
> Subject: Re: [Collins] R390A Oldham coupler assembly dimensions wanted
> Date: Fri, 20 Jun 2008 11:23:31 -0600
> On Wed, 2008-06-18 at 20:30 -0700, C E wrote:
> > Can anyone provide the dimensions of the Oldham coupler assembly for the R-390A PTO? I'm considering making/sourcing a new set of these units.  I need the shaft distances, the diameter of the middle plate and the two end plates, and the thickness of the middle plate. Thanks. Cal, n6KYR
> > 
> > 
> Its fairly complex. I've found it in the drawings. The coupler is spring
> loaded with a little spring having square hooks.
> 
> These parts:
> SM-B-178481 spring.
> SM-B-178491 insulator (3/16" i.d., 1/4" o.d. cemented to PTO shaft)
> SM-C-178492 Guide. This is the center washer. 1-3/32"  O.D. I didn't
> note the thickness. One groove is square, one is tapered at 30 degrees.
> SM-B-178665 Coupler assembly. Two parts, mounted to shafts with servo
> clamps (SM-B-178414 plus screws and nuts). One with square (though
> beveled) bar, one with tapered bar. Made of SM-C-178666 plates and SM-
> B-343637 pins.
> 
> This CD-ROM has its own drawing formats, that it won't convert to
> anything known by other programs. Its all scanned drawings, sometimes
> tough to read. It allows printing but I don't have a working printer at
> the moment.
> 
> I wonder how many R-390A have the coupler loading spring.
>