This paper presents precision planetary milling of spherical dimple texture. When the spherical dimple texture is milled using a ball end mill, form accuracy of the spherical dimple deteriorates by low cutting speed around the chisel of a ball end mill. Hence, planetary milling mechanism is proposed as an inclined spindle, which rotates a ball end mill, revolves around nomal axis (revolution axis) of a work surface. By developed mechanism, the revolution axis and the ball center of a ball end mill agrees in 1μm accuracy within ±2mm deviation. This accuracy is achieved by the principle of leverage around the gimbal joint using a pre-loaded ball bearing. A dimple texture without deterioration around a dimple center is made by the milling mechanism installed on a precision jig grinder.
