The ultra-precision positioning sys

The ultra-precision positioning system is one of the key components in the precision instrument. There is a lot of scope for research in ultra-precision positioning such as drilling machine, diamond cutting, wing flap control in aircraft etc.Hence there is an increase in the demand for machine tools that support the accuracy of sub-micron order. Industries demand for high productivity rates and require fast production machines which can produce, assemble, or manipulate parts at greater speeds and higher accuracy. Therefore for such applications different actuators are used [1-2].In earlier days hydraulic actuators were used in positioning applications. But hydraulic actuators require many valuable hours of testing and maintenance. Micro positioning applications such as data storage, medical and Micro-ElectroMechanical Systems (MEMS) Piezoelectric Actuators (PAs)are widely used. The PAs are best suited for micro positioning.But it may not be applicable for general engineering applications where large displacement is required. To achieve long servo distance the size of the PA can be increased. But increasing the size increases the drive voltage, complicates the manufacturing process and increases the cost [3-4].To achieve long servo distance and to control a system with high precision, a ball screw actuator driven by servo motor is used. A lot of research has been undertaken to characterize and control the behavior of the system under macro/micro scale in mechanical system. In order to deliver high precision positioning in work machines the ball screw actuator is used [5-6]. The actuator is driven by servo motor.Servo motor ensures precise control of angular or linear position.