Machine tool thermal displacement and magnification correction adjustment

A machine tool comprising:

• a workpiece holding unit configured to hold a workpiece;
• a tool holding unit configured to hold a tool, at least one of the workpiece holding unit and the tool holding unit being configured to be drivingly rotated, and at least one of the workpiece holding unit and the tool holding unit being configured to be drivingly moved in a predetermined direction so as to machine the workpiece with the tool;
• a plurality of temperature sensors attached to members constituting the machine tool;
• an environmental temperature system thermal displacement amount estimator configured to calculate an environmental temperature system thermal displacement amount due to a heat source existing outside the machine tool, based on temperature values each measured by a corresponding one of the plurality of temperature sensors;
• a correction magnification processor configured to multiply a calculation-based thermal displacement correction amount for compensating the environmental temperature system thermal displacement amount by a correction magnification value to calculate an environmental temperature system thermal displacement correction amount;
• a correction magnification adjustment operation section configured to adjust the correction magnification value;
• a driving system thermal displacement amount estimator configured to calculate a driving system thermal displacement amount due to a heat source included in the machine tool itself, based on a rotation driving state and a movement driving state of each of the workpiece holding unit and the tool holding unit;
• and
• a thermal displacement correction amount adder configured to add the environmental temperature system thermal displacement correction amount to a driving system thermal displacement correction amount for compensating the driving system thermal displacement amount to obtain and output a total thermal displacement correction amount based on which the machine tool performs thermal displacement correction control.