Royce Wise wrote:

Couple of pics for those interested in the single rotor.
The first one is the e-shaft cut to rough size, but not cut to length.

And this one is the shaft cut to length ready for the pulley bolt hole to be drilled and
tapped, and finish ground to size. On the front main journal you can see the hole left by the
rear rotor oil spray jet.  This will be plugged with a modified jet. (there are plenty of
threads left) The 3 lightening holes in the ecentric are there in the 13B shaft, but not on a
12A shaft, part of the reason for using the 13B shaft verses the 12A shaft.
Also the keyway has to be cut in the pulley end, but didn't have a 3mm mill so had to order
one.
The front main journal and the pulley end of the shaft are about 10k larger than the finished
size so the crank grinding machine can finish it to exact size, and we will know it is almost
perfectly true.
There is a radius on the shaft at the point of the ecentric, and the front main journal to
match the one on the rear of the ecentric, which relieves any stress there, but no radius on
the pulley extension as it gets the thrust bearing there.
For anyone interested, the rotor and main bearings are the same for the 12A and at least the
early 13B's, but I think they are the same on all the engines.
Royce

BTW check out that antique lathe that still cuts as true as any new one.

 
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