Ranges of Thompson ball screws

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 ball nut screws. All editions of Rockford ball screw have a distinctive job and design, although each design is fundamentally a ball screw. Therefore they possess 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 has two ball nut assemblies and a rolled thread ball screw. A unique approach as generally speaking a ball screw requires a single ball nut only. Preloading is possible because the ball bearings contained in the ball nut casing are positioned on either side of the screw. Spring packs are responsible for this. Preloaded Rockford ball screws are suffer from a loss of accuracy but are cheaper to make. The presence of two ball nuts equates to a slightly larger friction measurement and reduces the load carry capacity by only a small amount.

A different Rockford ball screw design is the freewheeling ball screw assembly. The identifying feature of this ball screw is that it has a ball cage inside the nut. This stops the nut from moving freely on the screw making use of stop pins. Efficiency is not reduced despite the ball cage; however there is a discrepancy between the effective screw lead and the actual. As a result of this the screw’s turning motion cannot be used to work out position. The keyway ball nut screw is a different design of Rockford ball screw that can be purchased from the company.