ABSTRACT
The state of the art of the machine industry has experienced a rapidly accelerating evolution since the outset of the first industrial revolution. Modern machines are required to perform to varying requirements of accuracy, productivity, and surface finish requirements. It is the purpose of this discussion to establish some guidelines of machine system design to attain the desired performance requirements of accuracy, surface finish, etc. Modern industrial machines are considered as a total system comprised of the control, drive, and machine. There are two kinds of performance criteria. One, referred to as indexes of performance (I.P.), relates to specifying servo drive stability in relation to design parameters. The second, performance characteristics, relates to parameters such as drive stiffness, resolution, maximum acceleration, and the effects of friction. To some extent the performance characteristics are a function or the end result of the indexes of performance that are selected.
