Conceivably on an NC lathe the cross slide could move in
and out during each revolution to keep the cutter in proper
depth contact most of the time. I don't know if this is done
or not. It is a lot of monkey motion. I have never even seen
a crank grinder. Here are a few pictures from the WWW.
Looks like the chucks are on rotating cross slides and the grinding
wheel is very large diameter. http://www.alsblowers.com/grinder.html

If it were me I would not bother doing it from scratch.
Let them come up with a two rotor e-shaft and cut it down.
Richard Sohn made one that way. Perhaps he will describe
how he did it.

Paul Lamar ...No rotor no motor.

I did my first e-shaft on the small South Bend.  Since I machine the taper
end of the original MZDA, it is a little different from what others do.
The first thing I did was taking the welding torche and doing a reverse
flame case-hardening on the lobe to be machind off. Using a carbide bit is
all it took.
For the new bearing surface, I use the inner race of a needle bearing with
the same diameter as the original MAZDA bearing. This configuration is still
running in the test engine. This way, I was able to crank out the test
engine without having to go to a machine shop.
The next e-shaft is almost done on the lathe, and will have a regular case
hardened bearing. I do not have a source yet for doing the hardening and
grinding. This will not be solved for some time to come, because of the side
housing work having priority.

Richard Sohn
N2071U

I was at Mazdatrix today and they have a whole pile of
used e-shafts for $50 each. Tell them you will use
just the rear rotor and they will pick out one with a
good rear rotor journal.

Paul Lamar ...No rotor no motor.

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