Internal cooling passages for rotating cutting tools

A cutting tool comprising:

• a tool body comprising a shank and a cutter opposite said shank, said tool body defining a length from a shank end to an end face opposite said shank end, a central axis extends along said length of said body;
• at least one tooth having a cutting edge, said cutting edge extending along said tooth from said shank to said end face;
• a flute formed adjacent said at least one tooth;
• and
• at least one cooling channel formed in said tooth proximate said at least one cutting edge, said at least one cooling channel having an elongated cross sectional shape with an elliptical portion and a circular portion opposite said elliptical portion, wherein said elliptical portion is located proximate said cutting edge;
• wherein said at least one cooling channel comprises a major axis aligned with a direction of resultant cutting force of said cutting edge.