If you are only doing one slot one time....and if the slot is relatively
short, then you can get by without any cutting fluid.
Just reduce speed and feed accordingly. A 3/8 slot in 1/8 thick sheet....
unless you are holding the material pretty close
to the slot you are cutting, the resulting vibration (chatter) will likely
cause more damage to your end mill than the lack of
a coolant.

Good luck!

"Geoff Schultz" wrote in message
6...
I need to mill a slot in some 1/8" 316 stainless steel and was wondering
what
I should be using for a cutting fluid. I'm planning on using a 3/8"
cobalt
coated roughing end mill.

-- Geoff