Drilling speed chart

Recommended spindle speeds (rpm) for diamond wire and core drills by outside diameter.

Drilling speed chart
Wire drills Core drills and similar by outside diameter
.75–2.5 mm 1/8 to 1/2 inch 5/8 to 1-1/2 inch 1-3/4 to 2-3/4 inch 3 to 4 inch
30,000 to 18,000 rpm 2,400–1,000 rpm 1,250–1,000 rpm 1,100–850 rpm 850–200 rpm