Turbine driven hammer that oscillates at a constant frequency

A drilling assembly, comprising:

• a drill bit, said drill bit including:
• a shank;
• a working face spaced apart from said shank;
• a bore extending between said shank and said working face, said bore configured to receive a drilling fluid;
• and,
• a jack element, said jack element including a distal end extending beyond said working face;
• a turbine disposed within said bore and configured to rotate under an influence of said drilling fluid;
• a porting mechanism disposed within said bore, said porting mechanism including:
• a piston chamber, said piston chamber including a piston in contact with said jack element;
• a first disc coupled to and configured to rotate with said turbine, said first disc including at least one first port and at least one exhaust port;
• and,
• a second disc, said second disc including at least one second port and at least one third port, said first port and said exhaust port alternately aligning and misaligning with said second port and said third port as said first disc rotates relative to said second disc, thereby allowing said drilling fluid to pass into and out of said piston chamber to extend said jack element beyond said working face and to retract said jack element.

A drilling assembly, comprising:

• a shank;
• a working face spaced apart from said shank;
• a bore extending between said shank and said working face, said bore configured to receive a drilling fluid;
• and,
• a jack element substantially coaxial with said axis of rotation, said jack element including a distal end extending beyond said working face;
• a turbine disposed within said bore and configured to rotate under an influence of said drilling fluid;
• a porting mechanism disposed within said bore, said porting mechanism including:
• a piston chamber, said piston chamber including a piston in contact with said jack element;
• a first disc coupled to and configured to rotate with said turbine, said first disc including a set of first ports;
• and,
• a second disc, said second disc including a set of second ports and a set of third ports, said set of first ports aligning and misaligning with said set of second ports and said set of third ports as said first disc rotates relative to said second disc, thereby allowing said drilling fluid to pass into and out of said piston chamber to cyclically extend said jack element beyond said working face and to retract said jack element.