Drill Bit Including One Piece Cutting Head

A one-piece cutting head for a drill bit, comprising:

• a main cutting edge extending substantially between opposite radial extremities of the cutting head;
• a plurality of arms extending substantially transverse to said main cutting edge, said main cutting edge defines an edge between rake surfaces and relief surfaces of the cutting head;
• each rake surface and each relief surface comprising a plurality of facets, each adjacent facet has a transverse edge between the facets, each transverse edge extending from the main cutting edge without meeting another transverse edge;
• each facet also has an outer edge spaced apart from the main cutting edge;
• and
• each arm extends substantially from the outer edge of one or more facets.

A one-piece cutting head for a drill bit comprising:

• a forward-facing main cutting edge that extends substantially between opposite radial extremities of the cutting head;
• a plurality of arms extending substantially transverse to said main cutting edge, said main cutting edge defines an edge between rake surfaces and relief surfaces of the cutting head;
• and
• the arms provide forward-facing convex crushing surfaces and no forward-facing cutting edge.