On Jan 13, 10:02*pm, " wrote:

The basic problem is one of rigidity.

Agreed, thought about that too. Vibration is a significant concearn

*The initial cut must also be
your finished cut, with regard to width. *

Never actually done this, of course, but from my limited machining
experience I'm not too sure that it's not a task that can't be done.
I was thinking something like a 4" grinder mounted to the tool post
with a carbide saw blade. once the fins got thin/deep enough wrap
some rubber tube or o-ring material in the fins adjacent to the cut.

Joke, right?

To remove swaged-in seats from aluminum heads you fire up your buzz-
box,

Nope, no joke. Real life is a joke at times :-( The shop I started
at had no form of electric welder! The pull'n was done/attempted with
one of those slide hammer tools like a large oil piston remover. When
I moved on to my own shop I couldn't justify the cost of the tooling
needed for valve seat replacement since new heads were so cheep ....
Brazil owed us lots of money back then :-)