Automatic measuring apparatus and control method for the same

A control method for an automatic measuring apparatus, the automatic measuring apparatus comprising:

• a measuring device configured to measure a workpiece dimension by detecting displacement of a movable element configured to move forward and backward to be brought into contact with or away from a workpiece;
• an automatic operation part configured to automate the forward/backward movement of the movable element by power;
• and
• a workpiece holding part including a holding shaft having a length in a direction along a direction of the forward/backward movement of the movable element and configured to hold the workpiece while the holding shaft is inserted in a hole in the workpiece, the control method comprising:
• moving, by the automatic operation part, the movable element forward to bring the movable element into contact with the workpiece;
• allowing, by the workpiece holding part, the workpiece to move in parallel along the holding shaft to change a position of the workpiece and to rotate to change a posture of the workpiece with a pressure lower than a measurement pressure preset in the measuring device;
• and
• acquiring, by the measuring device, a measurement value when the workpiece and the movable element are in close contact and a predetermined measurement pressure is generated between the workpiece and the movable element.