The measurement of the inner taper is usually performed on a sinusoidal scale or on a flat plate using a steel ball. However, special-purpose taper sleeves with a cone height of less than 30 mm are inconvenient to measure by these methods, and the measurement accuracy is low. It is a good method to measure the internal taper on the horizontal length measuring instrument by using the electric eye and the four equal measuring block. The contact is reliable and the measuring force tends to zero. It measures two perpendicular to the centerline of the cone
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