Edge preparation is essential maintenance for any cutting tool made from any material (scientists haven’t yet found a material that will stay sharp indefinitely, but they’re probably still looking). Since the first stone knife was fashioned, all those millennia ago, there has been a need for edge prep. Fortunately for those of us living in the 21st Century, edge preparation has become a lot easier. So, if you’re working with drill bits, endmills, reamers, taps, hob cutters, shaper cutters, stick blades, saw blades, or rock drills, you know by now that each of those tools will someday become dull enough that it will begin to negatively impact the time you put into your work and the quality of the product. But you’d never consider tossing a $69 carbide spur tip just because it was dull. That’s the kind of wasteful…