Patent ID: 7313992

Claim:
A rotary milling head for a rotary milling tool, comprising: a cylindrical body having an annular recess extending into the body along a rotational axis of the milling head for accepting an end portion of an annular metal tube, said body adapted to be connected to a rotary milling tool; and at least one cutting blade connected to a cutting blade support located at an axial end of said body by a securing element, said at least one cutting blade disposed circumferentially around the rotational axis of the milling head, said at least one cutting blade having a cutting edge defining an annular cutting sweep having an inner radius and an outer radius at least equal to an outer diameter of the tube, the cutting sweep adapted to remove an outer radial thickness from the annular tube in an amount of from about 2% up to about 25% of said annular tube radial thickness, wherein a portion of the at least one cutting blade axially extends a distance past the axial end of the cutting blade support, and wherein the at least one cutting blade cutting edge is rounded or comprises at least ⅛ of a circumferential segment of a circle.