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一大直径空心圆筒2固定于游标卡尺1尺架上,一小直径圆筒4和深度测尺3相固定,零位时小圆筒套入大圆筒腔内,为增大测量范围,可调换直径不同的圆筒。测量时,大圆筒随尺架插入零件5锥孔内直到被锥面托住为止,调动带小圆筒的深度尺到与锥面相接触,根据游标卡尺的刻度值确定出两圆筒之间的距离;根据两圆筒直径差,算出零件锥孔的锥度(参照预先按公式tgα=D—d/2L算出的角而缩制的度表。式中D—大圆筒的直径,d—小圆筒
A large diameter hollow cylinder 2 is fixed to the vernier caliper 1 feet frame, a small diameter cylinder 4 and the depth of the ruler 3 phase fixed, zero when the small cylinder sleeve into the large cylindrical cavity, to increase the measurement range, changeable Cylinders of different diameters. Measurement, the large cylinder with the chute into the tapered bore of the parts until the cone until 5, the transfer with the depth of the small cylinder to contact with the cone, according to the vernier caliper to determine the distance between the two cylinders (Refer to the degree table that is narrowed by the angle calculated in advance by the equation tgα = D-d / 2L, where D-the diameter of the large cylinder, d-the small cylinder