The forge makes use of a cylindrical forge chamber and a burner tube connected to the body. Gas forge: Gas forge is a type of forge that makes use of gas as fuel to produce heat. The gas could be either natural gas or propane gas. There are different designs for a gas forge, but blacksmith uses the most common and efficient design of gas forges. Welcome! Our power hammer project PDF documents are made for beginner to intermediate blacksmiths who have a minimum of tools. We've got several homemade blacksmith power hammer plan designs for sale plus plans for other type of blacksmithing tools.