Keep the burn at bay
A shop creep-feed grinding hardened steel using a water-based coolant kept running into trouble after grinding for a few hours. Everything would be grinding along fine, but then—WHAM—really bad burn would bring the job to a halt. And the burn wouldn't go away until the shop dressed the wheel again.
Dr. Jeffrey Badger, the host of Cutting Tool Engineering's Grinding Doc Video Series, provides some insight and a solution in the 65th episode of the video series.