Rockford Ball Screw

You will find a choice of Rockford Ball Screws are available today. The Rockford Ball Screw is available in three forms – free wheeling, preloaded and keyway ballnut screws. All of these types of Rockford ball screw vary in design and operation, but each ball screw still follows the standard approach. Therefore there are recirculated ball bearings, that move along the ball nut when the screw is rotated, unless the screw is being back-driven.

The preloaded Rockford Ball Screw features a rolled thread ball screw and no less than two ball nut assemblies. This is unusual because usually there would be only one ball nut on a ball screw. Preloading is possible as the ball bearings encased in the nut are placed on one side of the screw only, for each set of ball bearings. The manufacturers make use of spring packs to achieve this. Preloaded Rockford ball screws are suffer from a loss of accuracy but are more cost effective. The presence of two ball nuts means a slight increase in friction and effects the load capacity slightly but detrimentally.
A different Rockford ball screw design is the free wheeling ball screw assembly. What makes this assembly unique is the existence of a ball bearing cage, inside the ball nut casing. This allows the range of motion of the ball nut to be limited using stop pins. Efficiency is not reduced even with the ball cage, although a discrepancy appears between the acting lead of the screw and the actual one. As a result of this the movement of the screw does not give position information. The keyway ball nut screw is another type of Rockford ball screw that can be purchased from the company.