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

Less than 15 micro inches is good enough in my book!

( I have seen ad's for 7-10 on hard materials)
Blake

Yes but Jeff has experience with apex seal slots Blake.
Your book may not be good enough. We need numbers from Jeff.

Paul Lamar

The AirCraft Rotary Engine NewsLetter.              Powered by Linux.

http://home.earthlink.net/~rotaryeng/            http://www.linux.org