Abstract
We developed a high speed spindle device, which can be attached to the main shaft of a machining center and can be used for high speed cutting with small tools. To keep precise and high speed rotation for long time, externally pressurized air bearing and shrink-fit-chuck was adopted. A prototype of the spindle device was tested and it rotates at 150,000(min)^<-1> continuously and stably. This paper outlines the structure of the prototype and result of evaluation test.
