"Charles A. Sherwood" wrote in message
...
new grinders at 0.0001" runout. The wheel was trued before taking the
test
grinds. I believe that I fed the wheel about 5-10 thou into the diamond,
a
a thou or less per pass, with a couple of passes at the end with no
downfeed.. FWIW, the test grind was made with a couple of tenths
downfeed

I think that any dressing without actually removing stone hardens the
wheel.
Your last pass should remove 1 thou for a 32A type wheel and about 1/2
thou for a NSG blue wheel. Check the Norton web site for tips.

Thanks - I'll check out Norton.

FWIW, KO Lee suggests that 1 thou downfeed is best when rapid stock removal
is desired and lesser downfeeds when one wants to approach a mirror finish.