Rockford Ball Screw

You will find a choice of Rockford Ball Screws can currently be purchased. The Rockford Ball Screw is available in three forms – free wheeling, preloaded and keyway ballnut screws.

All of these options of Rockford ball screw have a distinctive job and design, but each ball screw still follows the standard approach. That is to say there are recirculated ball bearings, that cause the nut to move when the screw turns, unless the opposite movement is the case.
The preloaded Rockford Ball Screw features a rolled thread ball screw and no less than two ball nut assemblies. This is a specialised design as generally speaking a ball screw requires a single ball nut only. The preload effect occurs due to the fact that the ball bearings inside each nut are forced to opposite sides of the screw. This is done using spring packs. Preloaded Rockford ball screws are experience reduced levels of accuracy but are cheaper to make. The existence of two ball nuts adds to the friction by a small amount and reduces the load carry capacity by only a small amount.
A different Rockford ball screw design 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. This is used to restrict the distance that the nut can travel along the screw with the use of stop pins. Efficiency levels remain the same due to the existence of the ball cage, however a discrepancy appears between the actual lead of the screw and its effective lead. This means that the screw’s turning motion cannot be relied upon to determine positional data. The keyway ball nut screw is a different design of Rockford ball screw which is produced by the firm.