Patent ID: 6497540
Filing Date: 2002-12-24
Classification: B23C,Y10T

Abstract:
An endmill to be adapted to a machining center, comprising:a shank configured to be fixed to the machining center; a milling head having cutting teeth continuous from an outer peripheral surface of the milling head toward a forward tip face of the milling head; and a through hole extending from the forward tip face of the head to the shank past the head along a rotation axis of the endmill; wherein: the head and shank comprise separate component parts and the head is mounted on the shank by inserting a screw member from the tip end face into the hole and fixing the screw member to the shank; the through hole has a coolant passageway for discharging a coolant; and a sector angle &agr; connecting an edge of the through hole at the forward end side of the head to the center point of the cutting teeth is 10Â°&lE;&agr;&lE;90Â° when viewed in a longitudinal section including the rotation axis of the endmill.