Patent ID: 8041446

Claim:
A post-process sizing control device for a grinding machine having a workpiece support device for rotatably supporting a workpiece about a rotational axis; a wheel head rotatably carrying a grinding wheel and movable relative to the workpiece in a direction intersecting with the rotational axis; and a size measuring device for measuring the size of the workpiece; the post-process sizing control device comprising: origin compensation means for controlling the size measuring device to measure an actual size of a portion of the workpiece ground with the grinding wheel on the wheel head which is advanced by a predetermined amount in the direction and for compensating the origin of the wheel head by a position compensation amount which corresponds to a difference between the actual size and a theoretical size derived from calculation which the portion should reach when the wheel head is advanced by the predetermined amount; and size measuring interval setting means for setting the number of workpieces which should be ground during the next size measuring interval which begins after the preceding position compensation operation and ends with the next position compensation operation each of which is performed by the origin compensation means; wherein the size measuring interval setting means calculates an average position compensation amount by dividing a position compensation amount which the origin compensation means determines for the last workpiece during the present size measuring interval, by the number of the workpieces ground during the present size measuring interval, and then sets the number of workpieces which should be ground during the next size measuring interval based on the average position compensation amount.