Tech Tip #3: Drilling: Tendency to Over-speed

It is very common to over speed HSS tools as opposed to over feed. This generates excess heat at the cutting edges, prematurely dulling the tool and perhaps work hardening the work piece. HSS tools are designed to be fed heavily. Check the manufacturer's catalogs and literature to confirm ranges for cutting speeds and feeds. Use these guidelines as a starting point and work upward from there, but resist too high of a speed (RPM).