LINEAR MOTION Screw Type Standard Ball Nut S Th
Ball Screw Roller Screw
T omson High Load B
Diameter (mm) 125 63 75 Lead (mm) 20 20 20 20 Mounting Diameter (mm) 170 105 150 Overall Length (mm) 258 249 191 249 Dy Dynamic Capacity (kN) 470 480 80 490 Static Capacity (kN) 1534 1110 1265 34
FEATURE Cost (€) € 6700 € 4. 4.200 € 10.500
In another example, an injection
moulding application might require 400kN of force over 500mm, for which a designer might traditionally specify a roller screw. But that high force is required only for maybe the last 10mm, when the mould is being compressed. The user then is paying a premium for high load across the full stroke. By deploying a high load ball screw, though, the designer gets the needed power at the final 10mm, while additional load bearing potential factors into extended life for the product.
STANDARD OR CUSTOMISED Thomson provides a standard range of high load ball screws up to 160mm in diameter and with a maximum 1400kN dynamic load capacity, and can also provide customised ball screw assemblies according to specific application demands. Any new application will require careful
analysis of load capacity, product life and cost and, in doing so, there may still be some applications well suited to roller screws. But, given new ball screw technology advances that increase ball
“Thomson has developed a high load ball screw by
implementing a thread form that increases load bearing capacity four to eight times over traditional ball screws”
screw load bearing capacity, it is now possible to consider Thomson high load ball screws in any application for which you might now be considering a roller screw. It could pay off significantly.
Thomson Linear
www.thomsonlinear.com
In a roller screw, the load bearing mechanism is a set of recirculating rollers instead of balls
Servo Components offer a comprehensive range of Electric Linear Motors and Servo Drives
Low Cost
Direct Drive Linear Motor High Force – High Speed Long Stroke
XYZ Pick & Place 01202 666636
sales@servocomponents.co.uk www.servocomponents.co.uk
DESIGN SOLUTIONS | FEBRUARY 2019 17
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