Abstract: To provide a control panel for machine tools that improves operability and enables even an unskilled person to easily grasp a procedure for moving a screen to a target screen. A plurality of screen data are classified into a plurality of groups and classified into main screen data and sub-screen data associated with the main screen data in each of the groups. A control section displays the main screen data and displays the sub-screen data on a display section according to a type of an input to a plurality of main screen corresponding buttons.

Abstract: To provide a control panel for machine tools that improves operability and enables even an unskilled person to easily grasp a procedure for moving a screen to a target screen. A plurality of screen data are classified into a plurality of groups and classified into main screen data and sub-screen data associated with the main screen data in each of the groups. A control section displays the main screen data and displays the sub-screen data on a display section according to a type of an input to a plurality of main screen corresponding buttons.

Abstract: By controlling an amount of preload applied to a rolling bearing that supports a spindle in accordance with the change of state of the spindle in actual machining, the rotation of the spindle is controlled in an optimal state, and the service life of the bearing is extended while the required stiffness of the spindle is ensured. When a corrected preload amount falls outside a range of a preload as a controllable region, the corrected preload amount is corrected so as to fall within the range of the preload. That is, an actually controlled preload is regulated to fall within the preset range of preload. Therefore, it is possible to ensure the stiffness of the rolling bearing or prevent heating and excessive increase in contact pressure of the rolling bearing.

Abstract: By controlling an amount of preload applied to a rolling bearing that supports a spindle in accordance with the change of state of the spindle in actual machining, the rotation of the spindle is controlled in an optimal state, and the service life of the bearing is extended while the required stiffness of the spindle is ensured. When a corrected preload amount falls outside a range of a preload as a controllable region, the corrected preload amount is corrected so as to fall within the range of the preload. That is, an actually controlled preload is regulated to fall within the preset range of preload. Therefore, it is possible to ensure the stiffness of the rolling bearing or prevent heating and excessive increase in contact pressure of the rolling bearing.