Method of and instrument for measuring roll diameter in roll grinder

摘要

A method of measuring a roll diameter of a roll is provided. At first, a step-shaped conical master roll consisting of a plurality of diametrical parts is prepared and then, the diameters of the diametrical parts under predetermined standard temperature are measured. After mounting the master roll on a roll grinder under a temperature condition similar to that surrounding the roll mounted on the roll grinder, a diameter of one diametrical part, of which standard diameter is closest to the roll diameter of the roll, is measured. Next, a difference between the diameter value of the diametrical part and the standard diameter value is calculated as a correction value, so that the roll diameter value of the roll is corrected by the correction value.