Ultra precision machining is an abrasive precision machining method that uses fine abrasive stones mounted on a vibrating head to perform micro cutting of the workpiece. The main purpose of ultra precision machining is to reduce the Ra value, up to 0.2 to 0.012 μ m. The shape accuracy can be appropriately improved. Ultra precision machining has a high productivity and is commonly used to process the outer, inner, planar, channel surfaces, and spherical surfaces of crankshafts, rollers, bearing rings, and certain precision parts.

Precision machining processes refer to various machining processes that have higher machining accuracy and surface finish than corresponding machining methods. Precision machining processes include precision machining (such as diamond boring, precision turning, wide edge finishing, etc.) and high gloss and precision grinding. The machining accuracy of precision machining is generally 10~0.1 μ m. Tolerance grade is above IT5, and surface roughness Ra is 0.1 μ Below m.