Method for rapidly measuring inner diameter of jewel bearing

The invention relates to a method for rapidly measuring the inner diameter of a jewel bearing, which is based on a special workpiece positioning tool and completes measurement on an MARH three-coordinate measurement and control machine. A workpiece positioning tool is of a rectangular plate structure, a plurality of tool holes are evenly distributed in the rectangular plate in the transverse direction and the longitudinal direction, and the method comprises the steps that 1, after the workpiece positioning tool is fixedly bonded to a glass flat plate of an MARH three-coordinate measurement and control machine through plasticine, the vertical edge of the right side of the tool is set as the X axis, the lower transverse edge of the tool is provided with the Y axis, the intersection point of the connecting lines of the two edges is used as the original point, and a coordinate system is established; 2, measurement parameters are selected, including determination of light intensity, determination of Z coordinates