I knew an old commercial farm welder.  His shop was an old barn with dirt 
floors, this is why this worked.  He used water coming out of a quarter inch 
copper line.  Lots of water.  He just wanted to keep the bit cool and he oiled 
the bits after use. (Large bits well over an inch)
I have never done this and have never seen it elsewhere, so.... your mileage 
may vary.
Mike
AD6AA
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