In article ,
Joseph Gwinn wrote:

I just got a used shell mill mounted on a R8 arbor. The cutter is made
by Morse, is 1-1/8 inches in diameter, and has ten spiral teeth. It has

Typo. It's 2-1/8 inch in diameter.


no trouble whatsoever with aluminum. I was taking nearly full-width
passes, 0.015" or so deep. Didn't even slow down while I squared up a
block.

Steel will be another matter.