Helical coolant channels in cutting tools

A method of manufacturing a cutting tool comprising:

• forming a blank to have a plurality of helical coolant channels extending from entrances at or near a bottom of the blank, to within an interior of the blank, to or near a top of the blank;
• and
• grinding the blank to form a body comprising:
• a shank and a tip;
• wherein the tip comprises a plurality of spaced-apart, helical flutes, each of the plurality of spaced-apart, helical flutes comprising a helical cutting edge extending from a bottom of the tip, adjacent a top of the shank, to a top of the tip;
• wherein the tip further comprises a plurality of chip gash paths, each of the plurality of chip gash paths recessed between two of the respective plurality of spaced-apart, helical flutes, and extending from the bottom of the tip to a top portion of the tip;
• wherein the tip further comprises coolant orifice exits, the plurality of helical coolant channels extending from the entrances at a bottom of the shank, to within an interior of the shank, to within an interior of the tip, to the coolant orifice exits of the tip, the coolant orifice exits disposed in the plurality of spaced-apart, helical flutes adjacent the plurality of chip gash paths or disposed in a plurality of relief surfaces extending from the top of the tip downward to the plurality of chip gash paths, the coolant orifice exits spaced-apart from the top of the tip.