End mill convex radial relief surface and corner having circular arc profile

An end mill having a rotation axis defining forward and rearward directions, and comprising:

• front and rear ends, and a peripheral surface extending therebetween;
• a cutting portion extending rearwardly from the front end;
• and
• a shank portion located rearward of the cutting portion;
• the cutting portion comprising a tooth extending from the front end to the peripheral surface;
• the tooth comprising:
• a rake surface;
• a convex radial relief surface;
• a cutting edge formed at an intersection of the rake surface and the convex radial relief surface, wherein the convex radial relief surface has at least a portion thereof, immediately adjacent to the cutting edge, which is convexly-curved
• a corner comprising a circular arc profile defining a portion of an imaginary circle having:
• a circle center point with a radius magnitude M measurable from the circle center point to the circular arc profile,
• an axial tangent line which extends forwardly from the circle center point in a direction parallel with the rotation axis,
• an axial tangent point located at an intersection of the circle and the axial tangent line,
• a radial tangent line which extends radially outward from the circle center point and in a direction perpendicular with the rotation axis;
• a radial tangent point located at an intersection of the imaginary circle and a radial tangent line, and
• a radial tangent plane which extends perpendicular to the rotation axis and in which the circle center point, the radial tangent point and the radial tangent line, all lie;
• and
• a corner relief surface connected to both the rake surface and the convex radial relief surface, and extending rearward of the radial tangent plane.