A The process of working metal to a desired shape by impact or pressure in hammers, forging machines (upsetters), presses, rolls, and related forming equipment. that approximates the general shape of the final part with relatively generous The amount of stock left on the surface of the forging to be removed by subsequent machining. Also called "machining allowance" or "forging envelope." and radii. Such forgings are sometimes specified to reduce The machined recess in a die that gives the forging its shape. costs where only a small number of forgings are desired and the cost of machining each part to its final shape is not exorbitant.