3mm Apex seals:
As to modifying the rotors for the 3mm seals why not use a wire EDM

to

make the

new slots? No one has posted the tolerances yet, but I can hold a

tenth

with some

care in the lab, and I'm just a senior engineering student. If you

work

at it

millionths are doable. Some of the electrical parameters can be

jiggled

to leave a

very fine surface finish.

Are they currently ground out?
Blake
Cozy MkIV Canoe Stage

Yes. Hurley grinds them.

Paul Lamar

George Lendich wrote:

Excuse please,
What is a wire EDM. I noticed it mentioned a couple of times,
but still no idea !
George (down under)

EDM is something like Electron Displacement Machining.

Paul Lamar

Jeff Spitzer wrote:

EDM is electrical discharge machining which consists of bringing an
electrode in close proximity to the work and blasting away the metal one arc
at a time.  Wire EDM uses a thin vertical wire that is continuously moving
such that it is always clean and produces a repeatable thin scarf cut (2-D).
The accuracy of modern machines is superb but IMHO the surface finish will
never be adequate for seal slots due to the "pourous" nature of the
resulting surface.  The surface is effectively millions of small arc pits.

Jeff Spitzer

 
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