THROW-AWAY CUTTING ROTARY TOOL

摘要

In a rough cutter (20), square tips (51) and rectangular tips (52) are arranged in the second-fourth step portions (26-28) in a zigzag manner in the axial direction and a pair of the square tip (51) and the rectangular tip (52) form one cutting tooth. Consequently, the frequency of touching the blade root can be reduced effectively. Since cutting feed can be quickened by raising the cutting speed of the rough cutter (20), the work can be performed efficiently in the rough cutting process. Since the square tip (51) and the rectangular tip (52) have a simple profile, conventional throw-away tips available on the market can be utilized. Consequently, a user-friendly rough cutter (20) can be provided at a low cost.