Rockford Ball Screw

Rockford Ball Screw

There are a variety of Rockford Ball Screws can currently be purchased. The Rockford Ball Screw comes in a total of three types – free wheeling, preloaded and keyway ballnut screws. Each of these designs of Rockford ball screw have a distinctive job and design, but all have the standard ball screw features. Therefore they include recirculated ball bearings, which run on helical tracks to move the nut as the screw rotates, unless the screw is being back-driven.

The preloaded Rockford Ball Screw features a typical screw, along with two ball nut assemblies. This is a specialised design because usually there would be only one ball nut on a ball screw. Preloading is possible as the ball bearings contained in the ball nut casing are forced to opposite sides of the screw. Spring packs are responsible for this. Preloaded Rockford ball screws are less accurate than standard ball screws but cost less. The presence of two ball nuts adds to the friction by a small amount and lessens the load capability by a small number also.
A different Rockford ball screw approach is the free wheeling ball screw assembly. The identifying feature of this ball screw is the addition of a cage to the interior of the ball nut. Using this apparatus the ball nut can be restricted to a certain area on the screw through the positioning of stop pins. The efficiency is not detrimentally affected even with the presence of the ball cage, but a discrepancy appears between the actual lead of the screw and its effective lead. This means that the screw’s turning motion cannot be used to work out position. The keyway ball nut screw is another variation on the Rockford ball screw that is available from this factory.