Attached drawing cant is gotten when the bore on oblique plane, if use the twist drill of general geometry appearance, below the action that fights force in the radial of broach cutting blade, make the axes of broach deflective, assure the proper place of aperture very hard. If use attached drawing place to show the bit of appearance, the bit that gets a tip by similar center first gets work, have centering effect, next by broach two outside blade undertakes cutting. To reduce outside the radial cutting component of force of side edge, make bore quality gets assuring, mix in person knife when giving a knife, want to nod feed slow. CNC MillingCNC Machining