Twist drill assembly, components for same and method for making same

A method of making a twist drill comprising a twist drill assembly,

• the twist drill assembly comprising a shaft and a drill tip;
• the shaft having a single internal shaft conduit for a fluid, extending between orifices formed into the shaft, in which the shaft comprises three flutes and the internal shaft conduit presents a three-lobed shape in lateral cross-section through the shaft;
• the drill tip having an internal drill tip conduit for the fluid, extending between orifices formed into the drill tip;
• the shaft and the drill tip configured such that the drill tip is connectable to an end of the shaft with the internal drill tip conduit in communication with the internal shaft conduit, allowing the fluid to be capable of flowing from the internal shaft conduit into the internal drill tip conduit;
• the internal shaft conduit presenting an orifice at an end of the shaft and having a spiral form aligned with a central longitudinal axis of the shaft, and configured to complement the arrangement of spiral flutes formed on the shaft;
• the method including joining the drill tip to the end of the shaft by means of braze material disposed between the drill tip and the shaft;
• and boring at least one internal drill tip conduit through the drill tip, the internal drill tip conduit extending from a working surface of the drill tip to the orifice of the internal shaft conduit.