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Ball Screws

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Our ball screws are precision rolled and hardened, ISO Class 7. They are offered in 12, 16, 20 and 25mm diameters with either machined or unmachined ends. We offer screws in length up to 3000mm from stock. Need a custom machine end? Please submit a drawing and we will quote it for you.  Our ball screw nuts are offered in several different designs and load capacities with and wthout wipers. Accessories for ball nut mounting and end bearing assemblies alow for complete ball screw assemlbies to be offered off the shelf.  

A ball screw drive is an assembly that converts rotary motion to linear motion very efficiently.  It consists of a ball screw that can be either rolled or ground for more precise applications. A ball nut mounted on the ball screw has recirculating ball bearings located between the outside of the ball nut and the ball screw.  The ball bearings roll in matching ball forms or threads that are on both the ball screw and ball nut.  At the end of a ball circuit on the ball nut, there is a small device that channels the ball bearing back to the beginning of the circuit on the ball nut. The critical fact is that the ball bearings ROLL between the ball screw and ball nut. This compares to an ACME NUT which slides with surface to surface contact between an ACME nut and ACME screw. Because the ball bearings roll, the ball nut moves along the ball screw with very high efficiency, typically greater than 90%. The forces transmitted through the ball screw to the ball nut are distributed over the total number of ball bearings, giving a low relative load per ball comparatively. Thus, the ball nut moves efficiently with very low friction and converts large rotary forces into large linear drive forces very easily because of the number of ball bearings sharing the load.
 

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