Machine Design – May 2019

High-Load Ball Screws

nuclear power plants. Large fabrica-

tion machines rely on ball screws to

drive horizontal and vertical axes and

provide long and reliable performance

with minimum maintenance. Mills,

water jets, plasma cutters, automatic

welders, and other large equipment

used in industrial fabrication must

often move heavy loads accurately and

safely across ball-screw-driven hori-

zontal and vertical axes.

Consider a machine running a 100

kN load 24/7, for example. Based on

the standard life calculation, a ball-

nut drive in the application may last

three to four months, according to

A

high-load ball screw developed by

engineers at Thomson Industries

uses a specially designed thread form that

increases load-bearing capacity by a factor

of four to eight compared to traditional ball

screws. This lets designers use ball screws in

almost any application that previously required

roller screws.

62

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MAY 2019 MACHINE DESIGN