External scrap is material from other forming processes such as punching, forging, or machining. Metallurgy is limited to forging and blacksmiths. Shaping metal with a hammer (forging) is the archetypical component of smithing. These processes prepare the workpieces for further forging processes. The synchronizing rings are produced either by massive forming (common forging) or sheet metal shaping. The most common construction methods for crankshafts are forging (usually through roll forging) or casting. The process is mainly used to provide optimized material distribution for subsequent die forging processes. Commonly used for forging aluminium, which has a lower forging temperature than steels. Steel blades are commonly shaped by forging or stock removal. The most common type of forging equipment is the hammer and anvil. He integrated crafts as ceramics, stained glass, wrought ironwork forging and carpentry into his architecture. Yamaha claims advances in metal forging technologies made this a practical production sportbike. Its spars were machined from a single forging that spanned across both wingtips. Blaser makes their barrels by hammer forging. Mass manufactured kitchen cutlery uses both the forging and stock removal processes.