Method for measuring diameter of small end of outer raceway of conical outer ring by using steel ball

The invention discloses a method for measuring the diameter of a small end of an outer raceway of a conical outer ring by using a steel ball, and relates to the technical field of bearing measurement. The method solves the problem that the diameter of the small end of the outer raceway of the conical outer ring cannot be measured without a three-coordinate measuring machine, a standard component and advanced measuring equipment, so that the urgent need of production is difficult to guarantee. The method comprises the following steps: firstly, performing temperature combining treatment on a conical outer ring, measuring equipment and a standard steel ball; measuring the diameter d of the standard steel ball by adopting a vertical length measuring instrument; placing the standard steel ball in the outer raceway of the conical outer ring, and measuring the distance A 'E between the highest point of the standard steel ball and the end face of the small end side of the outer raceway of the conical outer ring by ad