There is a much easier way of making a broadhead and that is to start with a triangular piece of metal about 3 mm thick (long triangle about 2 cm at the base and 5 cm high). Thin the metal at the base of the triangle to about 1.5 mm using first a peen and last the flat of the hammer to work out the bumps, expanding the base to about 4 cm. This creates a flange, with 3/5 of the triangle untouched and the lower part expanded. Then, roll the flattened flange into a socket by crimping the head of the socket at yellow heat (about 2 cm up from the base of the triangle) and tapping the sides of the flange inward to form the socket. Roll on the anvil, closing and overlapping and the finish the shaping on a spike. Then all you need to do is thin both sides of the triangle above the socket to form the cutting edges. Forming a socket this way takes a bit of practice, but once you get the hang of it, you can move on to spearheads, javelins, socketed pila, ballista bolts and what have you. For a more peacefull use, make a shovel, same way of shaping the socket!