DRILLING Point Angle (2β)

—The point angle is selected to suit the hardness and brittleness of the material being drilled.
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Harder materials have higher point angles, soft materials have lower point angles.—

An increase in the drill point angle leads to an increase in the thrust force and a decrease in the torque due to increase of the orthogonal rake angle.

—This angle (half) refers to side cutting edge angle of a single point tool.—

     Standard Point Angle is 118°

   It is 116° to 118° for medium hard steel and cast iron

— It is 125° for hardened steel
    It is 130° to 140° for brass and bronze
—It is only 60° for wood and plastics