ROTARY CUTTING TOOL AND METHOD OF DETECTING REFERENCE POSITION

摘要

A highly practical rotary cutting tool that can detect a reference position without causing a tool tip to come into contact with a contact type position detector and that can, even if the diameter of the rotary cutting tool is very small, highly precisely detect the reference position at low cost by using the contact type position detector. The rotary cutting tool has a blade part (1) on the tip side and also has a shank part (2) on the base end side. A surface (4) perpendicular to the rotation axis of the tool is formed on the shank part (2) or on a projection at which the blade part (1) projecting from the shank part (2) is formed.