Avoid cage creep

Back to Basics: When using linear roller bearings, various anti-cage creep mechanisms can help retain accuracy by limiting unwanted movement.

04/01/2010


When using linear roller bearings, various anti-cage creep mechanisms can help retain accuracy by limiting unwanted movement. The term "anti-creep" is used to describe the method of eliminating any slippage of the retainer holding the crossed rollers between the two V-grooved rails of the slideway.

It then can be used in any mounting direction and with lower momentum motors, such as linear motors. Anti-creep devices include rack and pinion mechanism; an external attachment made of plastic gears outside of the rail; and a metal gear inside of the rail. Some are quite expensive.

NB Corporation of America offers an anti-cage creep mechanism called the Studroller, which uses a roller with round balls studded around its surface. By placing studs in the center roller and machining a path along the rail, this retainer will never slip. It has the smoothest tracking motion and therefore is quieter. It is suitable for high acceleration, vertical mounting and uneven load distribution.

Since the Studroller from NB Corporation of America uses a ball bearing, as opposed to a gear or exterior control, it costs about half of what other anti-creep devices do. In addition, there are no redesign costs to replace a standard slideway. See how it works in a PDF by NB Corp. at www.nbcorporation.com/catalog/pdf/nv_nvt.pdf

- Naoki Yamaguchi is assistant technical manager for NB Corporation of America, www.nbcorporation.com. April 2010 "Back to Basics" inthe North American edition of Control Engineering has more about the advantages of linear bearings . Edited by Mark T. Hoske, editor in chief, Control Engineering , www.controleng.com.



No comments
The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by...
Each year, a panel of Control Engineering editors and industry expert judges select the System Integrator of the Year Award winners.
Control Engineering Leaders Under 40 identifies and gives recognition to young engineers who...
Learn more about methods used to ensure that the integration between the safety system and the process control...
Adding industrial toughness and reliability to Ethernet eGuide
Technological advances like multiple-in-multiple-out (MIMO) transmitting and receiving
Virtualization advice: 4 ways splitting servers can help manufacturing; Efficient motion controls; Fill the brain drain; Learn from the HART Plant of the Year
Two sides to process safety: Combining human and technical factors in your program; Preparing HMI graphics for migrations; Mechatronics and safety; Engineers' Choice Awards
Detecting security breaches: Forensic invenstigations depend on knowing your networks inside and out; Wireless workers; Opening robotic control; Product exclusive: Robust encoders
The Ask Control Engineering blog covers all aspects of automation, including motors, drives, sensors, motion control, machine control, and embedded systems.
Join this ongoing discussion of machine guarding topics, including solutions assessments, regulatory compliance, gap analysis...
News and comments from Control Engineering process industries editor, Peter Welander.
IMS Research, recently acquired by IHS Inc., is a leading independent supplier of market research and consultancy to the global electronics industry.
This is a blog from the trenches – written by engineers who are implementing and upgrading control systems every day across every industry.
Anthony Baker is a fictitious aggregation of experts from Callisto Integration, providing manufacturing consulting and systems integration.
Integrator Guide

Integrator Guide

Search the online Automation Integrator Guide
 

Create New Listing

Visit the System Integrators page to view past winners of Control Engineering's System Integrator of the Year Award and learn how to enter the competition. You will also find more information on system integrators and Control System Integrators Association.

Case Study Database

Case Study Database

Get more exposure for your case study by uploading it to the Control Engineering case study database, where end-users can identify relevant solutions and explore what the experts are doing to effectively implement a variety of technology and productivity related projects.

These case studies provide examples of how knowledgeable solution providers have used technology, processes and people to create effective and successful implementations in real-world situations. Case studies can be completed by filling out a simple online form where you can outline the project title, abstract, and full story in 1500 words or less; upload photos, videos and a logo.

Click here to visit the Case Study Database and upload your case study.