Machine tool system and opening stop position calculating device

A machine tool system comprising:

• a machine tool equipped with an openable and closable door configured to close an opening of a cover that surrounds the machine tool, and an electric motor configured to open and close the door;
• and
• a workpiece exchanging device configured to carry out exchange of a workpiece placed inside the cover;
• the machine tool system further comprising:
• an opening width setting unit configured to set an opening width of the door that is necessary for exchanging the workpiece;
• an opening stop position calculating unit configured to calculate an opening stop position of the door at which a total time becomes minimum, wherein the total time is obtained by summing a time required to move the door from a fully closed position to a position of the set opening width, and a time required to move the door from an opening stop position at which the door is opened more than the opening width and stopped to the fully closed position;
• and
• a door control unit configured to control the electric motor based on the calculated opening stop position when the workpiece is exchanged by the workpiece exchanging device, and thereby move the door from the fully closed position to the opening stop position,
• wherein the door control unit controls the electric motor to initiate a door opening operation or a door closing operation, wherein,
• during the door opening operation, the door is moved from the fully closed position to the calculated opening stop position, and
• during the door closing operation, the door is moved from calculated opening stop position to the fully closed position.