Method for detecting product coaxiality of medium and large step type rotating member

The invention relates to the technical field of coaxiality detection in mechanical test and detection, and provides a method for detecting product coaxiality of a medium and large step type rotating member. A steel wire, machine oil, a plump bob and a test plate serve as auxiliary tools for the method, and a measuring rod serves as a measuring tool for the method. According to the method, the coaxiality of the rotating member with the large diameter in the middle, with a non-machined face and with the high requirement for coaxiality at the two ends is detected through the simple auxiliary tools, the coaxiality is detected through the method in a simplification and plebification mode, and detection can be achieved for general small and medium-sized enterprises.