Machine tool

A machine tool comprising:

• a spindle to which a tool is attached;
• a workpiece support section that supports a workpiece;
• a servo motor that rotates or moves the workpiece support section relative to the spindle;
• and
• a control device that controls the servo motor when machining of the workpiece is performed by the tool, wherein
• the control device displays an adjustment screen for adjustment of either of a gain and a filter of the servo motor on a display device or displays an indication for guidance which guides an operator to the adjustment screen on the display device when the control device recognizes that the servo motor is newly mounted, when a machining program of the workpiece is changed, or when an operation value of the servo motor or a value calculated based on the operation value deviates from a predetermined criterion, wherein
• the control device has an automatic adjustment program that performs automatic adjustment of the gain and the filter of the servo motor, and
• the automatic adjustment program causes the control device to execute:
• making the servo motor perform a first motion to perform adjustment to adjust the gain and the filter;
• making the servo motor perform a second motion using the gain and the filter adjusted in the adjustment to perform calculation for determining inertia of a portion that includes at least the workpiece or the workpiece support section;
• and
• time constant adjustment in accordance with the inertia estimated by the calculation.

A machine tool comprising:

• a spindle to which a tool is attached;
• a workpiece support section that supports a workpiece;
• a servo motor that rotates or moves the workpiece support section relative to the spindle;
• and
• a control device that controls the servo motor when machining of the workpiece is performed by the tool, wherein
• the control device displays an adjustment screen for adjustment of either of a gain and a filter of the servo motor on a display device or displays an indication for guidance which guides an operator to the adjustment screen on the display device when the control device recognizes that the servo motor is newly mounted, when a machining program of the workpiece is changed, or when an operation value of the servo motor or a value calculated based on the operation value deviates from a predetermined criterion, wherein
• the control device is configured to receive a mounting signal when connection between the servo motor and the control device is made, the mounting signal indicating that the connection is made, and
• the control device causes the display device to display a screen for initial settings including pole position detection of the newly mounted servo motor, and then causes the display device to display the adjustment screen or display the indication for guidance which guides the operator to the adjustment screen.