Double disc grinding offers a highly productive and accurate means for machining to-size parts with flat and parallel sides. In this grinding method, two opposed abrasive discs, each mounted on its own spindle, simultaneously grind opposite and parallel faces on pieces traversed between them via any of several fixturing/carrier techniques. Because multiple parts are ground on both sides simultaneously, production rates are generally greater than those obtained with surface grinding. The economy of double disc grinding is of prime importance in the cost reduction considerations. Double disc grinding combines high production and precise control of size, flatness, parallelism, or surface finish.