Patent ID: 7037049

Claim:
Rotary cutting tool adapted for rotation about an axis of rotation, said rotary cutting tool comprising a cutting part centered on the axis of rotation of the tool and comprising a side surface with at least one side cutting edge and an end surface with at least one end cutting edge, means for feeding fluid being provided for feeding a fluid onto the end surface, close to each end cutting edge, the means for fluid feed comprising a central lubrication channel drilled along the axis of rotation of the tool and having a closed end, and at least one secondary channel having a smaller cross section than said central lubrication channel and linking the closed end of the central channel to the end surface, close to each end cutting edge, wherein the end surface of the tool has a concave shape and the end cutting edge, relative to a plane perpendicular to the axis of rotation of the tool, forms an end dedendum angle between about 3° and about 20°, wherein each side cutting edge comprises a non-nil circular land, less than 0.1 mm.