抄録
This paper describes the development of a ultra-high speed spindle using ceramic ball bearing. Recently, rotational speed of ball bearing spindle for machining center must be increased to satisfy the requirement of high-productivity. In this paper, we present two types high speed spindles which are a 50000 (min)^<-1> spindle with a diameter of 50mm, and a 20000 (min)^<-1> spindle with a diameter of 90mm.
