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Low Cost Automation Tutorial

#271 Ball Screws -13: Life

Category : Linear Motion Components
January13, 2017

This volume explains the life (in a broad range) of ball screws designed for ultra-precision positioning through case examples.

Abnormal life of preloaded ball screws

-Manufacturers are shifting towards producing high-value-added products, they are adopting ultra-precision and high-rigidity ball screws more frequently than before. For this type of product, the product life ends when you experience degraded performance due to localized wear and fatigue (degraded positioning performance) instead of the life calculation value explained in the previous volume.
-The life of preloaded ball screws is shown in the following graphs.

[Fig.1] Initial shape of thread groove,[Fig.2] Wear state of thread groove after use,[Fig.3] Initial shape of nut groove,[Fig.4] Wear state of nut groove after use,[Photo 1] Worn-out part of nut

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