Chucking reamers (Figures H-113 to H-115)are efficient in machine reaming a wide range of materials and are commonly used in drill presses, turret lathes, and screw machines. Helical flute reamer have an extremely smooth cutting action that finishes holes accurately and precisely. Chucking reamers cut on the chamfer at the end of the flutes. This chamfer is usually at a 45-degree angle.