Superhard constructions & methods of making same

A superhard polycrystalline construction comprising:

• a body of polycrystalline superhard material having a cutting face;
• and
• a substrate bonded to the body of polycrystalline superhard material along an interface;
• the construction having a central longitudinal axis extending therethrough and a peripheral side edge;
• wherein:
• the substrate comprises a substrate body and a first end surface forming the interface, the first end surface of the substrate comprising a projection extending from the body of the substrate into the body of superhard material towards the cutting face, the projection having an outer peripheral surface, the body of polycrystalline superhard material extending around the peripheral outer surface of the projection;
• wherein the body of polycrystalline superhard material has a thickness from the cutting face along the peripheral side edge to the interface with the substrate of at least around 4 mm;
• and
• wherein at least a portion of the projection has a thickness measured in a plane extending along the longitudinal axis of the construction of at least around 4 mm.