Patent ID: 8622661

Claim:
A tool with an internal fluid passage, said tool comprising: a shank; a cutting blade mounted on said shank; and an internal fluid passage for drawing in, together with air, chips produced when the cutting blade machines a workpiece; wherein said internal fluid passage made in said tool comprises: a through hole made in said shank; at least one main inlet hole for drawing in said chips together with said air, said main inlet hole being made in said cutting blade and being in fluid communication with said through hole; and at least one sub-inlet hole for drawing in at least said air, said sub-inlet hole being made in said shank and being in fluid communication with said through hole, said through hole has a larger cross-sectional area than said main inlet hole, said sub-inlet hole has a sub-central axis (CL 2 ) which is inclined a predetermined angle to a main central axis (CL 1 ) of said through hole, said air, which flows through said sub-inlet hole, flows obliquely to and joins said air flowing through said through hole, and said sub-inlet hole extends from an opening in said shank toward said through hole, said opening being side-by-side with said main inlet hole in directions radially from said main central axis of said through hole.