Grinding apparatus

A grinding apparatus comprising:

• a work table configured to hold a workpiece;
• a grinding wheel configured to grind the workpiece while rotating;
• and
• a detection sensor configured to detect a position of a work surface of the workpiece in contact with the work surface, wherein
• the detection sensor is configured to be brought into contact with the workpiece to measure the workpiece,
• the grinding apparatus, further comprising:
• a feeding means configured to feed the detection sensor or the work table and move the detection sensor and the work table relative to each other;
• a control device configured to numerically control the feed by the feeding means;
• and
• an operating means configured to manually input an instruction of a feeding operation of the feeding means into the control device such that one of the detection sensor or the work table changes a position relative to the other by a manual operation input through the operating means, wherein
• the control device is configured to control the feeding means by the manual operation of the operating means to bring the detection sensor into contact with the workpiece and record a coordinate of a contact point,
• after the feeding means causes the detection sensor to come into contact with the workpiece and the feeding means causes the detection sensor to separate from the workpiece, the control device is configured to perform control of feeding the detection sensor or the work table at a lower speed than the first time and bringing the detection sensor and the workpiece into contact with each other.