Diamond Drill speed
Diamond drill speeds vary depending upon the manufacturer and type of diamond drill. Diamond Core Drill Bits , for use on glass, stone and tile should be used at slow to very slow speeds, with the speed decreasing as the hardness of the material increases. The performance of diamond core drill bits will be enlarged by using the following drill speeds. Recommended Drill Speeds Diamond Drill Bits Recommended Drill Speed (rpm) Material Bit Size --> 1/2" 1" 2" 3" 4" Fiberglass 1200 700 350 250 175 Glass, Ceramic & China 800 500 250 160 125 Limestone & Marble Stone 600 450