Spindle assembly having an electrode spindle

摘要

A spindle assembly has a rotatable spindle which is electrically insulated from its housing by means of a moulded synthetic resin layer surrounding bearing holders. Electric current for effecting electrolytic grinding is supplied by a brush member which is in contact to the rear end of the spindle, the contact portion of the spindle and the brush having air circulating pathes for cooling and ejecting out powdered-brush-material and have radiating surfaces exposed to cooling air flow.