Mps ball screws convert rotary motion into linear motion. They consist of a screw and a nut. Ball screws have a number of bearing balls that transfer the load between the nut and the screw. Screws are amazingly versatile and powerful fasteners. The basic concept is used for holding all sorts of things together including wood, plastic and metal. Different varieties have been developed to maximize efficacy for particular applications.

All about screws:

Traditional nuts have a round threaded interior that accommodates the screw. The threads guide the screw through the nut. Bearing balls are placed between the nut and the screw. Bearing balls reduce friction in moving parts. Without the bearing balls, the friction would cause the moving parts of the ball screw to slow down and to wear out quickly. A ball screw's nut has an interior ogival shape that creates two arcs with identical radii that offset the nut's centers. Measurement includes: Land Diameter - The outside diameter of the screw is called the land diameter. It will be less than the ball circle diameter. Ball Circle Diameter - When the bearing balls come in contact with the screw and nut, the ball circle diameter is the size of the interior circle they create. Lead - The lead is the axial (parallel) distance that the nut advances in one revolution around the screw

Also parts of the ball screws include: Bearing Ball Circuit - this is the closed path through the nut that the bearing balls follow. Return Guide - The bearing balls circulate in the ball screw's nut. Once the balls have completed their turn through the ball circuit, the return guide returns them to the beginning of the circuit.

Conclusion:

A servo-driven ball screw is more suitable when high-feed forces are involved, and is more economical to install for shorter axis movements. Two problem areas associated with ball screws are cumulative/lead variation errors and backlash. Cumulative error over the length of a ball screw can be compensated by a CNC control system; however, lead variation error requires a vast amount of computational power to completely correct, hence most algorithms merely ease the problem, and not fix it. The ball screw provides mechanical advantage as it transforms rotary motion into linear motion

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