Abstract: A method and apparatus for the manufacture of pulleys is presented, wherein the pulley is manufactured from a blank placed between a head stock and a tail stock assembly. While maintaining constant pressure between these two assemblies, the head stock assembly is spun and the pulley blank is transformed into the pulley through the application of stress upon the sidewalls of the pulley blank. When a multiple groove pulley is desired, this transformation is administered by the combination of at least two external spin rollers and at least one internal spin roller, the latter deforming the pulley blank while positioned within the internal circumference of the pulley blank and mounted on an internal roller shaft, rotatable within the pulley drive shaft. When a single groove pulley is desired, the external spin roller may deform the pulley blank.