Patent ID: 7950880
Filing Date: 2011-05-31
Classification: B23G,B23P,Y10T

Abstract:
1. A spiral fluted cutting tap for cutting threads into a wall of a bore, the tap comprising: an elongate body having a forward end and a rearward end; the elongate body having a fluted portion beginning near and extending in a rearward direction from the forward end, and the fluted portion having a spiral flute defining a cutting edge adapted to cut threads; the spiral flute presenting a concave cutting face, and the concave cutting face being defined by a first radius; the spiral flute further presenting a concave core surface adjacent to the concave cutting face, and concave core surface being defined by a second radius; the spiral flute further presenting a convex blending surface adjacent the concave core surface, and the convex blending surface being defined by a third radius; and the spiral flute presenting a convex heel surface adjacent to the convex blending surface, and the convex heel surface being defined by a fourth radius.