Patent ID: 8051754

Claim:
A lathe, comprising: a main spindle ( 30 ) including a chuck for grasping a work (W); a tool post configured for a tool for machining said work by abutting on said work, to be attached to said tool post; a tool post drive unit which transfers said tool post ( 40 ) in an X-axis direction, which is a direction extending from said tool ( 41 ) to said work (W), and in a Y-axis direction different from said X-axis direction; a control unit which performs control to drive said tool post drive unit, such that said tool ( 41 ) is transferred in said X-axis direction and in said Y-axis direction; and an input unit for inputting a value of a diameter of said work (W) measured, wherein said control unit applies, via said tool post drive unit, first cutting to said work (W) and subsequently second cutting to said work (W) while transferring said tool ( 41 ), which is attached to said tool post ( 40 ), in said X-axis direction, calculates an amount of deviation, along said Y-axis direction, between a cutting edge height of said tool ( 41 ) and a center line of said work (W), based on a first diameter value of said work (W) after said first cutting is applied, a second diameter value of said work (W) after said second cutting is applied, and a travel distance of said tool ( 41 ) in said X-axis direction from when said first cutting is finished until when said second cutting is finished, wherein said first and second diameter values and said travel distance are input from said input unit, and applies, via said tool post drive unit, third cutting to said work (W), after said amount of deviation is corrected.