The power hammer is where blacksmithing stops being a contest of endurance and becomes a problem of controlled energy delivery. A hand hammer might deliver a few hundred joules per blow at 40 to 60 strikes per minute. A mechanical power hammer drives a ram weighing tens to hundreds of pounds at 100 to 300 blows per minute, moving far more material in a single heat before the steel drops below its working range. How the major designs deliver the blow: - Steam hammers: James Nasmyth sketched his design in 1839, lifting the ram with steam and letting gravity or steam pressure drive it down - Mechanical spring hammers: a flywheel and crank drive the ram through a spring linkage, as in the Little Giant built by Mayer Brothers in Mankato, Minnesota - Self-contained air hammers: one piston compresses air that drives a second ram piston, as in Massey and Bêché machines, giving fine control from a light tap to a full blow The metallurgy is why this matters. Hot forging above the recrystalli...