Machine tool and control method of machine tool

A machine tool comprising:

• a table which holds a workpiece;
• a spindle which holds a tool;
• a first feed motor which relatively moves the table and the spindle in a first direction which intersects a longitudinal direction of the spindle;
• a second feed motor which relatively moves the table and the spindle in a second direction which is along the longitudinal direction of the spindle;
• and,
• a control unit which controls the first motor to relatively move the table and the spindle so as to position a first cutting position and a second cutting position of the workpiece with respect to the tool, and which controls the second motor to relatively move the table and the spindle so as to move a distal end of the tool between a distant position which is located away from the workpiece and a predetermined depth position of the workpiece, wherein,
• the control unit sequentially performs:
• a first process in which the second cutting position is positioned with respect to the tool after cutting of the first cutting position is completed;
• a second process in which the distal end of the tool is moved from the distant position to the predetermined depth position of the workpiece;
• and
• a third process in which the distal end of the tool is moved from the predetermined depth position of the workpiece to the distant position, and
• wherein the control unit is configured to:
• relatively move the table and the spindle simultaneously in the first direction and the second direction while the distal end of the tool moves from the distant position to a reference position, which is located between the distant position and the workpiece by starting the second process before completion of the first process;
• and
• relatively move the spindle and the table simultaneously in the first direction and the second direction while the distal end of the tool moves from the reference position to the distant position by starting the first process before completion of the third process;
• and
• controls speed of the relative movement between the table and the spindle in the third process based on the predetermined depth position and distance in the first direction between the first cutting position and the second cutting position.