On Sun, 6 Mar 2011 20:12:43 -0600, "Snag"
wrote:

Karl Townsend wrote:
Got a tuff little job for tomorrow morning...

I'm making a new end of an air cylinder. Start with a 3.5 by 3.5 block
1.5" thick. Center and turn in the lathe so you now have a 2.5" round
protruding 0.25".

Now for the tuff part, turn a groove 0.062" wide on the face right at
the 2.5" round. (This holds rubber ring seal). I've turned a groove on
a face in the lathe before, but never with the protrusion in the way.

I started grinding a little tit on the end of a cutoff HSS tool. I can
see this effort will break right off. I'm thinking to try mangling a
two flute endmill in the morning.

Maybe somebody has a better idea.

Karl

The groove is right at the base of the cylindrical part ? Can you put the
block on a rotary table , mill the round , change to the appropriate end
mill to cut the groove ?

That's a thought. I'd like to try in the lathe first though, cause it
will hold tight tolerance.

Right now, I'm a dreamin' up some way to hold a 1/16 endmill. Put one
in backward ground into a "D". It would stick out 5 diameters if I
hold it in a collet. May just snap right off.

Karl