Method for measuring full runout of engine cylinder crankshaft hole

The full runout of the engine cylinder crankshaft hole is an important parameter to reflect the machining quality of the cylinder crankshaft hole. The machining quality of the crankshaft hole directly affects the operating state of the engine. The defective crankshaft hole is one of the important reasons for the occurrence of "lava", "irverse noise", "engine noise" and "extinguish". At present, the major engine manufacturers have set strict quality standards for the importance of the crankshaft hole. For example, the full-bounce of the crankshaft hole of the Fukang sedan engine can't exceed 15μm, the roundness does not exceed 5μm, and all are equipped with a high precision circle. Instrument and special testing equipment. The author has been engaged in this inspection for 6 years. In the long-term testing practice, he has summarized some experiences on the measurement of crankshaft hole full-beat measurement. I hope that the peer experts will give corrections.