mist or flood?

[TomG]

I've worked in a number of grinding shops almost none of them used coolant on the surface grinders. If you are generating enough heat to turn the part brown, there are a number of things that can be done to reduce it. Moving to a softer, more friable wheel will help, as will decreasing the depth of cut and increasing the feed rate. A lot of side movement of the wheel helps as well, as in 3/4" overlap with a 1" wheel (light cuts of course). Quickly covering the entire surface of the part means more heat in the chips and less in the part.

Tom