Abstract
Usually, a pair of cone centers have been used for supporting the workpiece in cylindrical grindings. Then, the roundness of ground surface is influenced by the form errors of cone centers and center holes, misalignments and lubrication. Although it costs much time and money, the center holes must be ground or lapped for the precise cylindrical grinding. The purpose of this paper is to establish a grinding method which makes precise cylinders easily and inexpensively. In the experimental apparatus, two holders press the workpiece through each balls. Both the holders and the workpiece have center holes. The experiments were conducted under following two conditions. First, the balls were fixed on the holder. Second, the balls were fixed on the workpiece. The latter was better than the former to finish the accurate cylinder. In the latter condition, 0.5μm out-of-roundness of the ground surface was obtained with the precise balls of0.7μm out-of-roundness.
