Patent ID: 6371100
Filing Date: 2002-04-16
Classification: B28D

Abstract:
A machining apparatus comprising:at least means for holding a workpiece to be machined; a spindle unit comprising a rotary spindle having a machining element attached thereto for effecting a required machining work on the workpiece and a spindle housing rotatably bearing said rotary spindle; and means for supplying said spindle unit with fluid for use in machining said workpiece, wherein means for supplying said spindle unit with fluid includes a flow control provided in a fluid flowing passage for controlling the flow rate of said fluid in response to the rotating and stopping of said rotary spindle and wherein said means for supplying said spindle unit with fluid comprises at least a cooling water source, a cooling feeding conduit for feeding said spindle housing with cooling water, and a coolant draining conduit for draining all the cooling water from said spindle housing after use; said coolant feeding conduit having a first control valve as said flow control, thereby reducing or stopping cooling water to said spindle housing when said rotary spindle is not rotating.