Correct speed for a very thin slotting saw?

Since this is only one slot and presumably you're in no rush, I'd be conservative and start around 50FPM and perhaps 1/2 thousandth feed per tooth. If the location of the slot is critical you may want to make cheeks for your arbor to support the saw near its periphery.

If you've never used a saw this thin, they're tougher than you'd expect. Unless the slot is very deep this should be quite easy.

Ned Simmons -- spent 10 hours last week removing 2 grams of molybdenum with .012 slitting saws

Which works out to about 64 RPM, assuming a 3" diameter slitting saw.

Agreed -- controlled by how deep the slot needs to be.

Cutting brass -- you probably need no lubricant.

But a flow of compressed air to keep the chips from flowing back into the area of cutting would be a good idea.

And it if *is* very deep, make lots of passes.

Do you have a horizontal spindle milling machine? That is what the slitting saws are made to be used in. However, you can get away with a vertical spindle mill and the right arbor for something this light a cut.

Good Luck, DoN