Steven, thanks for the explanation; makes sense.

With three mills in the shop all doing milling stuff, plus a couple of lathes and surface grinders, I get oil & chips everywhere; face milling some soft 1018 will throw oily chips a good 10 -15 feet.

Thats why the separate room for bluing and CCH.

For my carding I use a 3 Phase motor with a Variable Frequency Drive (VFD), that allows me to go from 0 to 3450 rpm or any speed in between with a turn of a dial.

Ohnice work on those barrels.

Respectfully

Mike