Patent ID: 8171608

Claim:
A milling tool, being rotatable about an axis, for machining a workpiece, said milling tool comprising: a milling tool base body, rotatable about said axis, with at least one cutting insert, rotatable about said same axis, said at least one cutting insert being disposed to permit machining of the workpiece for rough-machining; a grinding wheel comprising a grinding surface configured to be disposed towards the workpiece and configured for finishing the workpiece subsequent to rough machining by said at least one cutting insert; said grinding wheel and said at least one cutting insert being disposed to rotate about the same axis, which axis is the axis of rotation of said milling tool base body; said grinding wheel being disposed at least partially within said tool base body and being rotatable about said axis; said grinding wheel being adjustably extendable, relative to said tool base body, from a retracted rest position disposed away from a machining position of the grinding wheel to an extended active position which is the machining position of the grinding wheel, and being adjustably retractable from the extended active position to the retracted rest position; a displaceable body, mechanically connected to said grinding wheel, being disposed and configured to displace said grinding wheel from the retracted rest position to the extended active position, and from the extended active position to the retracted rest position; a cooling fluid supply being disposed and configured to supply cooling fluid to said displaceable body and said grinding surface of said grinding wheel; a pressure chamber connected to said cooling fluid supply; said displaceable body comprising a wall of said pressure chamber; said cooling fluid supply being operatively connected through said pressure chamber to said displaceable body to communicate cooling fluid to said displaceable body to displace said grinding wheel from the retracted rest position to the extended active position, and to permit retraction of said grinding wheel from the extended active position to the retracted rest position; at least one retracting element being configured and disposed to produce a force on said displaceable body to retract said grinding wheel from the extended active position to the retracted rest position upon reduction of pressure in said pressure chamber; a passage, operatively connecting said cooling fluid supply to said grinding wheel, being configured and disposed to supply cooling fluid from said pressure chamber to said grinding surface of said grinding wheel; said passage being configured and dimensioned to sufficiently restrict flow of cooling fluid to maintain a pressure in said pressure chamber sufficient to position said grinding wheel in said extended active position in contact with a machining surface; and said passage also being configured and dimensioned to provide and direct pressurized cooling fluid to said grinding wheel to cool said grinding wheel.