A pilot or spot drill, also known as a starter drill, is typically required when the succeeding drill is longer than 10xD or smaller than Ø 1.00 mm. Starter drills can also be used to improve hole location due to their short, rigid geometries.
The Lollipop cutter from SPHINX is the newest addition to its end mill cutter lineup. It is ideal for machining undercuts, deburring and multi-axis machining.