Segmented wheels help increase the life, permit high-speed cutting, and more.
The changing shape and composition of camshafts are challenging those responsible for surface finishing. Camshaft grinding requires instantaneous changes in wheel-work contact length and material removal rates. So the arc of contact is large as the wheel passes over the flanks and becomes smaller as the nose and base circle are ground. As the De increases, more abrasive particles come in contact with the work material. This reduces the force acting on each grain, and makes the ploughing and sliding interactions more dominant.