Old message Apr 20, 2011

Good morning Paul
I am sending you the propeller shaft design and i would like to know if
Jeff can machine this shaft and how much.
I specified sae 4130 but you can recommend a better choice for shafting
and treatment.
I modified my housing design for a larger surface bearing at prop side
and also a better ring gear attachment with back plate and rivets plus
bolts.
The ring gear back plate is already machined .
With Alibre i can not convert for Rhino files but dwg can be open with
Solid Works eDrawing

Jean Prudhomme

Looks good Jean. Is it an exact copy of a Lycoming or Continental shaft?

If so that is good. Do you mean planet carrier back plate? If you
want a 2.85:1 gear box you will need to drive the planet carrier
and hold the ring gear stationary.

You will have to contact Jeff directly and see if he will do it.
If you are only making one or two you don't need an NC lathe.

jeff doddridge <4starr@cox.net <mailto:4starr@cox.net>

Paul Lamar

Yes Paul this is the exact Lycoming 10-540 big journal from the seal to
the flange included, i did turn around 180 degree the planet outer ring
and machined the back plate and fix with rivets a larger plate in dia so
i can bolt it to the housing and the fact the planet stay forward  i
will need a thin oil impregnated flat washer between the outer ring and
the back plate and panet housing.

I did drive out the small gears shaft from the planet and i will make 6
longer shaft for the small gears to been driven by the propshaft and
the planet embossed reset shaft will be press fit into the propeller shaft.
I intend to built one unit for testing and built a second one may be more.
I will request also a quote from a drive shaft manufacturer if they have
the material available

Jean Prudhomme

New message I think :)

Jean,   IMHO the rear flange that the planetary attaches to needs a large
radius fillet where it meets the shaft OD for the same reasons as the flange
on the other end.  Also the internal bulkhead might be easier to fabricate
if the center had a conical 120 degree depression the same shape as the
largest drill bit you will use before changing to the boring bar A boring
bar small enough to machine the center flat would be seriously overhung at
that depth.  The shallow end could be cut to constant thickness by setting
the compond to 30 degrees.  You might save on machining costs if you cut the
billet down to .100 from all the surfaces and have the fine finish cuts done
by someone like Jeff.  The bearing journals will likely be done by a
crankshart repair shop who could chrome the journals as well.
george.grimes7@gmail.com <mailto:george.grimes7@gmail.com>

  Milo,  The attachment I tried to send was from this e-mail. See lycoming
1.jpg and the two following images.  I would not characterize these thrust
surfaces as large compared with the automotive equivalent especially
considering the smaller shaft diameter of the Lycoming opposed 4 cylinder
engines.

george grimes


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