ABSTRACT
In many cases, an optimal design study of the mechanical element will result in invaluable savings or in an appreciable improvement in product performance or quality. For many mechanical elements, adequate design is really the optimal design. Optimal design of a mechanical element is the selection of the material and the values for the independent geometrical parameters with the objective of either minimizing an undesirable effect or maximizing the functional requirement. In the optimal design of a mechanical element, the most important design equation is the one that expresses the quantity upon which the particular optimal design is based because it controls the procedure of design. In the optimal design of mechanical elements, the design equations other than the primary design equations are called the subsidiary design equations and generally express either functional requirements or significant undesirable effects whether they are directly specified or indirectly implied. Tooth alignment error is also known as the error of distortion.
