George Lendich wrote:

Paul,
Have a look at the attached GIF.

Firstly I'm unable to get the Bearings you selected on your PSRU drawing,  in Australia, but have
been able to ID a replacement but their not LL's (lighter than light) or even L's because their
far too expensive. The replacement is a little larger and out of a Volvo Diff- the data is being
sent to me from Timken (some extra weight).

Now , as we don't have Chrome Molly readily available here, in any form (everything is sent from
the USA) - I thought I'd investigate Tracy's molded strategy, and no worries I can get parts made
inexpensively enough. I can get all the parts made from the same material (C.M.) - harden the
Flange and drive end of the shaft and leave the prop shaft annealed.
BTW is 8 x 6mm bolts enough to hold the prop shaft on !?

But as you can see the bolts now line up with the locating section of the flange-Ahhh !!!!!!

Now with all this research I can now appreciate Tracy's and Don's approach - with the shaft and
flange being one piece, molded with a solid shaft. Much simpler, cheaper, easier to machine
(possibly stronger), smaller and lighter bearings.

I discussed, with the local foundry, on possible problems with the thin aluminium PSRU housing.
The main concern with thin casting is the distance the aluminium has to travel and having  enough
access points to minimize this. Have you had any feed Bach from your contact on the feasibility of
your one piece PSRU housing.
George (down under)

It would be stronger George if you hogged it out of
billet and brazed it to the shaft. The front flange does not
need to be removable.

Paul Lamar
 
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