A surfacing lathe is used to machine large workpieces. Due to the immobility of the machine, heavy workpieces can be supported and high machining forces can be applied. The workpieces that can be machined include gears, flywheels, and pulleys. Also notice the two-cylinder steam engine. This was used to drive the rotation systems. The energy provided was used by the mechanical drive of the rotating technology and the resulting exhaust steam was used for heating the mass to be rotated.