Drill bit, tap hole drilling machine equipped with said drill bit, and process for making said drill bit

15:

• The drill bit according to claim 14, wherein at least one of the protruding teeth has the longitudinal axis (Y-Y) forming an angle (α) with the face supporting the teeth which is equal to 90° and at least one of the protruding teeth has the longitudinal axis (Y-Y) forming an angle (α) with the face supporting the teeth which is less than 90°.

16:

• The drill bit according to claim 15, wherein the angle (α) which is less than 90° is between 45 and 89°.

17:

• The drill bit according to claim 15, wherein at least one of the protruding teeth has a flat leading face perpendicular to the longitudinal axis (Y-Y) and at least one of the protruding teeth has a flat leading face forming an angle (β) with the longitudinal axis (Y-Y) which is less than 90°.

18:

• The drill bit according to claim 14, wherein at least two of the protruding teeth have the longitudinal axis (Y-Y) forming an angle (α) with the supporting face which is less than 90° and the longitudinal axes are inclined in different directions from each other.

19:

• The drill bit according to claim 14, wherein each tapered drilling face has at least three teeth.

20:

• The drill bit according to claim 14, wherein each tapered drilling face has five teeth and wherein the flat face has three teeth.

21:

• The drill bit according to claim 14, further comprising an air flow path including a straight blind passage formed along the longitudinal axis (X-X) of the drill bit body, and as many inclined passages as tapered drilling faces, the inclined passages extending between the straight blind passage and the flat face of the leading end.

22:

• The drill bit according to claim 21, wherein each inclined passage leads to an opening facing one tapered drilling face and wherein each tooth of the flat face is located facing one recess.

23:

• A tap hole drilling machine comprising:
• a drill bit according to claim 14.

24:

• A method for making a drill bit according to claim 14, comprising the step of:
• manufacturing the drill bit in three dimensions.

25:

• The method according to claim 24, wherein the manufacturing includes operating a fiber laser able to melt fine metal powder, the fine metal powder being a nickel-based alloy.

26:

• The method according to claim 25, wherein the nickel-based alloy is UNS N07718.

27:

• A computer assisted design file comprising digital information for the implementation of the method according to claim 24 when loaded onto a three-dimensional printer.

28:

• Computer readable media, having stored thereon, computer executable instructions for performing the method of claim 24.

29:

• The drill bit according to claim 14, wherein the at least three recesses are partly-circular.