Along with the recent developments in the optical communication industry, the demand for optical communication components has increased. Ferrule is a significant element that determines transmission efficiency and quality of information in the optical communication area. Most ferrule machining entails grinding and this requires high processing precision. Therefore, the ultra precision centerless grinding machine for ferrule grinding was designed. The centerless grinding machine is composed of a high damping bed, grinding wheel spindle unit, regulating wheel spindle unit, feeding table and dressing unit. Reliability prediction is very important for the high quality design. In this study, reliability of the centerless grinding machine was predicted.