Patent ID: 7089836

Claim:
A hale-machining method comprising the steps of: mounting a rotary table rotatably around a first rotating axis; mounting a rotary base on said rotary table rotatably around a second rotating axis perpendicular to said first axis; mounting a tool holder on said rotary base rotatably around a third rotating axis perpendicular to both of said first rotating axis and said second rotating axis; setting a haling tool on said tool holder in such a manner that a cutting point of said haling tool is substantially coincided with an intersection of said first rotating axis, said second rotating axis and said third rotating axis; straightly moving said tool holder and a workpiece table holding a workpiece relatively along a machined surface of said workpiece in three perpendicular axes including an axis parallel to said first rotating axis; rotating said rotary table and said rotary base in such a manner that a tool axis direction of said haling tool is substantially coincided with a normal direction of said machined surface; and rotating said tool holder in such a manner that a front rake surface of said haling tool is substantially directed in perpendicular to a feeding direction of said haling tool.