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Ball Screw Drive in CNC Milling Machines Abstract: Ball screw drive is one of the most important components of CNC milling machines. It is responsible for the transmission of motion between the motor and the spindle of the machine. The ball screw drive consists of a screw, a nut, and a set of balls that roll between the screw and the nut. This paper provides a review of the ball screw drive in CNC milling machines. Introduction: CNC milling machines are widely used in various industries for machining parts with high precision and accuracy. These machines are controlled by a computer program that guides the motion of the spindle and the workpiece. The motion of the spindle is achieved by the use of a ball screw drive, which converts the rotary motion of the motor into linear motion of the spindle. Ball screw drive: The ball screw drive consists of a screw, a nut, and a set of balls that roll between the screw and the nut. The screw is a threaded shaft that is driven by the motor. The nut is a housing that holds the balls and guides their motion. The balls are usually made of steel or ceramic and have a diameter of a few millimeters. The ball screw drive has several advantages over other types of drives, such as the lead screw drive and the rack and pinion drive. It has a high efficiency, which means that it requires less energy to drive the spindle. It also has a low friction, which reduces the wear and tear of the components and increases the lifespan of the machine. In addition, the ball screw drive has a high precision, which allows for accurate and repeatable machining. Conclusion: The ball screw drive is an important component of CNC milling machines. It provides a reliable and efficient way to transmit motion between the motor and the spindle. The use of ball screw drive has revolutionized the field of CNC machining by allowing for high precision and accuracy.