Method of preforming a coolant type drill

Claim 1

THE METHOD OF FABRICATING A ROTARY DRILL FOR BORING A HOLE IN A WORKPIECE WHILE SUPPLYING LIQUID COOLANT TO THE CUTTING ZONE IN THE END PORTION OF THE HOLE, SAID METHOD COMPRISING THE STEPS OF PROVIDING A GENERALLY CYLINDRICAL DRILL SHANK HAVING AN AXIAL COOLANT BORE EXTENDING THERETHROUGH AND HAVING A PAIR OF CONCAVE FLUTES FORMED ON OPPOSITE SIDES THEREOF, MOLDING A GENERALLY CYLINDRICAL ONE-PIECE CUTTING TIP IN A DIE SET, SAID TIP HAVING A CONE-SHAPED CUTTING END INCLUDING CUTTING EDGES, PLACING IN THE DIE SET BEFORE THE MOLDING OPERATION A CORE ELEMENT HAVING A CYLINDRICAL PORTION AND A PAIR OF BRANCH PORTIONS WHICH ARE CHORDAL IN CROSS SECTION, SAID CHORDAL PORTIONS HAVING FLAT SECTIONS SPACED APART FROM ONE ANOTHER IN SUBSTANTIALLY PARALLEL RELATIONSHIP, SAID CORE ELEMENT ADAPTED TO FORM AN AXIAL COOLANT BORE INCLUDING A PAIR OF COOLANT NOZZLES COMMUNICATING WITH SAID BORE AND STRADDLING SAID CUTTING EDGES, SAID PAIR OF COOLANT NOZZLES BEING GENERALLY CHORDAL IN CROSS SECTION, REMOVING SAID CORE ELEMENT FROM THE CUTTING TIP AFTER MOLDING THE SAME IN SAID DIE SET, WHEREBY SAID COOLANT NOZZLES HAVE OPEN ENDS ON OPPOSITE SIDES OF SAID CUTTING EDGES, FORMING A PAIR OF CONCAVE FLUTES ON OPPOSITE SIDES OF SAID TIP COMMUNICATING WITH SAID CUTTING EDGES, LOCATING THE ONE-PIECE CUTTING TIP ON THE WORKING END OF THE SHANK WITH THE BORE OF SAID TIP IN ALIGNMENT WITH THE BORE OF THE SHANK AND WITH THE CONCAVE FLUTES OF THE CUTTING TIP ALIGNED WITH THE FLUTES OF THE DRILL SHANK, AND ATTACHING SAID TIP TO THE WORKING END OF THE SHANK, WHEREBY DURING A DRILLING OPERATION, SAID COOLANT NOZZLES ARE PRESENTED TO THE END SURFACE OF SAID BORE HOLE ABOVE THE CUTTING EDGES THEREBY CONVERTING SAID CONE-SHAPED CUTTING TIP INTO CLOSED COOLANT PASSAGEWAYS FOR PROJECTING STREAMS OF COOLANT ACROSS SAID CUTTING EDGES.

Claim 2

THE METHOD OF FABRICATING A ROTARY DRILL FOR BORING A HOLE IN A WORKPIECE WHILE SUPPLYING LIQUID COOLANT TO THE CUTTING ZONE IN THE END PORTION OF THE HOLE, SAID METHOD COMPRISING THE STEPS OF PROVIDING A GENERALLY CYLINDRICAL DRILL SHANK HAVING AN AXIAL COOLANT BORE EXTENDING THERETHROUGH AND HAVING A PAIR OF CONCAVE FLUTES FORMED ON OPPOSITE SIDES THEREOF, MOLDING A GENERALLY CYLINDRICAL ONE-PIECE CUTTING TIP IN A DIE SET, SAID TIP HAVING A CONE-SHAPED CUTTING END INCLUDING CUTTING EDGES, PLACING IN THE DIE SET BEFORE THE MOLDING OPERATION A CORE ELEMENT HAVING A CYLINDRICAL PORTION AND A PAIR OF BRANCH PORTIONS WHICH ARE CHORDAL IN CROSS SECTION, SAID CHORDAL PORTIONS HAVING FLAT SECTIONS SPACED APART FROM ONE ANOTHER IN SUBSTANTIALLY PARALLEL RELATIONSHIP, SAID CORE ELEMENT ADAPTED TO FORM AN AXIAL COOLANT BORE INCLUDING A PAIR OF COOLANT NOZZLES COMMUNICATING WITH SAID BORE AND STRADDLING SAID CUTTING EDGES, SAID PAIR OF COOLANT NOZZLES BEING GENERALLY CHORDAL IN CROSS SECTION, REMOVING SAID CORE ELEMENT FROM THE CUTTING TIP AFTER MOLDING THE SAME IN SAID DIE SET, WHEREBY SAID COOLANT NOZZLES HAVE OPEN ENDS ON OPPOSITE SIDES OF SAID CUTTING EDGES, FORMING A PAIR OF CONCAVE FLUTES ON OPPOSITE SIDES OF SAID TIP COMMUNICATING WITH SAID CUTTING EDGES, LOCATING THE ONE-PIECE CUTTING TIP ON THE WORKING END OF THE SHANK WITH THE BORE OF SAID TIP IN ALIGNMENT WITH THE BORE OF THE SHANK AND WITH THE CONCAVE FLUTES OF THE CUTTING TIP ALIGNED WITH THE FLUTES OF THE DRILL SHANK, AND ATTACHING SAID TIP TO THE WORKING END OF THE SHANK, WHEREBY DURING A DRILLING OPERATION, SAID COOLANT NOZZLES ARE PRESENTED TO THE END SURFACE OF SAID BORE HOLE ABOVE THE CUTTING EDGES THEREBY CONVERTING SAID CONE-SHAPED CUTTING TIP INTO CLOSED COOLANT PASSAGEWAYS FOR PROJECTING STREAMS OF COOLANT ACROSS SAID CUTTING EDGES.