I know talk is cheap, but every time I look at a 20-b e-shaft
I can't help but thing that it's a no-brainer to cut on any decent
CNC lathe.  I'm sure there's a bit more to it than turning a hunk
of steel and hardening the crap out of it.  Anyone have any
in site into what's *really* involved in making a 3 rotor e-shaft?  I
know a few others have done it.

Thanks,
Bob

I think you are pretty much right.
I think you need to grind and polish it after it is turned
and heat treated.
-- 
Paul Lamar ...No rotor no motor.

Bob,
Well there's selecting the right material in the first instance as different
heat treatments for different materials have different outcomes.
Of course there's the core toughening characteristics required as well as
the surface hardness. You would need to know those parameters to advise the
heat treaters.

Yes CNC would be good, but you need to grind before you heat treat, so
selection of heat treatment and therefore material is important as you don't
want too much distortion. A final polish will be required. CNC will  give
the most accurate eccentric off-set and the centre oil line needs to be
accurately drilled.
That's only the one rotor and 2 rotor, I know nothing about the 3 rotor, so
the position of the 3 rd.  lobe and joining the two pieces, is probably
another story.
So apart from those things your probably right - piece of cake!

Oh yeh then theirs the balancing - probably better to buy one, no matter
what the cost!
George (down under)

Grind AFTER heat treat.

Paul Lamar

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