Control method of a machine tool

A computer program product comprising a machine readable non-transitory storage medium having program instructions stored therein which when executed cause a machining system to perform a control method of a machine tool, the machining system including the machine tool and a computer connected electrically to the machine tool, the machine tool including a table for supporting a workpiece to be machined, and a tool unit disposed relative to the table and including a tool for machining the workpiece, the computer being programmed to control operation of the machine tool, and storing positional information associated with the tool for machining the workpiece, a stand-by height with respect to a supporting surface of the table, a present machining height with respect to the supporting surface, a preset first deviation value and a preset second deviation value,

• wherein the control method includes the following steps of
• by the computer, determining a raised height with respect to the supporting surface which is lower than the stand-by height, and determining, according to the raised height and the preset first deviation value, a maneuvering height with respect to the supporting surface which is lower than the raised height,
• causing, by the computer, the tool to move horizontally to a machining position according to the positional information,
• when the tool has arrived at the machining position, causing, by the computer, the tool to move vertically toward the workpiece to the machining height to machine the workpiece,
• by the computer, causing the tool to move vertically away from the workpiece to the raised height, and when the tool is at the maneuvering height, causing the tool to move horizontally to a next machining position according to the positional information while the tool is moving vertically away from the workpiece to the raised height,
• when determining that a horizontal distance between a current position of the tool and the next machining position is equal to the preset second deviation value, causing, by the computer, the tool to move vertically toward the workpiece to the maneuvering height while the tool is moving horizontally to the next machining position, and
• when the tool has arrived at the next machining position, causing, by the computer, the tool to move vertically toward the workpiece to the machining height to machine the workpiece.