Cutting Bur Lubricant
Bur lubricant is used by engravers or rotary tool users. Touch your cutting burr or engraving point into the lube before cutting.
You would never run your car engine with out oil. Cutting burr lubricant works in the same way. Ask any professional engraver if they use a cutting lube of some type. Cutting lube leaves a brighter, cleaner cut with less tear out. A small amount will last you years and years.