Hey all you smart guys.  Why can't the apex groves just be welded up and a new groove cut?  Welds are supposed to be as strong
as the base metal or stronger.  It is not a "new" technology.  EDM machining has been recommended to cut the grooves to 3 mm so
what am I missing?  Is there a better way to do it?  Cheaper alternative?    Cast our own rotors?  Tell me more.  Talent and ideas are
not in short supply on this list.

Jim Brewer
Albemarle, NC

Jim, The rotors are a cast material, I am going to worry about any solution that doesn't remove material, IE. machining or EDM. A cast material can be hard to weld properly. Even if a cast material is soft it can crystalize below the surface in the presence of too much localized heat. (like welding) I'm not knocking welding since I have that miller syncrowave 250 in my shop, I just wouldn't weld up apex seal slots. Milling to 3mm of EDM to 3mm is another mater. I would consider both of those re-work solutions provided the other slots were well within spec. I would also suggest that shot peening and ceramic coatings should be a good addition to our engines.

Bill Jepson