Orbital end mill

The present invention relates to tools for the machining of solid materials, namely an improved end-mill particularly suited for use in an orbital mode in the milling of recesses. The orbital milling tool for cutting openings in a solid material, wherein the openings include normal cylindrical through holes, blind holes, holes including recesses, screw threaded holes, tapered holes and double tapered holes, aid tool having a shank portion adjoining a cutting portion, the axis of the cutting portion being spaced apart from the spindle axis of a machine tool in which the shank is to be held. The cutting portion having a plurality of roughing cutting edges, a plurality of semi-finishing edges axially spaced apart by means of a first transition section from the roughing cutting edges and a plurality of finishing edges axially spaced apart by means of a second transition section from the semi-finishing cutting edges. The maximum diameter of the semi-finishing edges being larger than said roughing cutting edges and