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Linear Motion Tips

Covering Linear Motion Systems, Components and Linear Motion Resources

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Crossed-roller slides

Linear and rotary motion components satisfy aerospace requirements

★ By Lisa Eitel Leave a Comment

Linear guides, cam followers, and crossed-roller bearings can satisfy the demanding requirements for space-flight hardware. By IKO engineering staff | www.ikont.com As space activity shifts from governmental agencies to a growing industry driven by commercial entities and even startups, the types of spacecrafts and the missions they support are also expanding. This diversifying industry is […]

Filed Under: Applications, Crossed-roller slides, Featured, Integrated Linear Systems, Slides + guides (all) Tagged With: IKO

Contact angle: What is it and how does it affect linear bearing performance?

★ By Danielle Collins Leave a Comment

contact angle and load distribution

In profiled rail linear guides that use balls or rollers, the geometry and arrangement of the bearing raceways play a significant role in the bearing’s load capacity, friction, rigidity, and ability to withstand errors in mounting. But there’s another aspect of a bearing’s design that also plays a role in its load capacity and rigidity […]

Filed Under: Ball + roller guides, Crossed-roller slides, FAQs + basics, Featured, Linear bearings

How to choose a lubricant for recirculating linear bearings

★ By Danielle Collins Leave a Comment

All metal-on-metal recirculating bearings require lubrication in order to function properly and provide a reasonable bearing life. Lubrication reduces friction and heat by separating the rolling elements from the bearing raceway, inhibits corrosion, protects bearing surfaces from contamination, and helps seals run smoothly and operate effectively. Although the importance of lubrication is clear, choosing the best […]

Filed Under: Applications, Ball + roller guides, Crossed-roller slides, FAQs + basics, Featured, Linear bearings

Mechanical properties of materials: Hardness

★ By Danielle Collins Leave a Comment

hardness testing

Hardness is a common specification for linear shafts and guides — especially those used with ball and roller bearings, where the guide encounters extremely high loads over very small areas. The hardness of a bearing surface can significantly affect the life of the system and is often accounted for by applying a hardness correction factor […]

Filed Under: Applications, Ball + lead + roller screws, Ball + roller guides, Crossed-roller slides, FAQs + basics, Featured, Linear bearings, Rack + pinion sets

What is cage creep and why does it matter?

★ By Danielle Collins Leave a Comment

Several types of non-recirculating linear bearings use a cage to contain the rolling elements, maintain consistent spacing between them, and ensure even load distribution. But in each of these non-recirculating designs, the cage “floats” between the two moving components, meaning that it’s not constrained and can gradually move away from its intended, centered position. This […]

Filed Under: Ball + roller guides, Crossed-roller slides, FAQs + basics, Featured

Anti-friction miniature linear guides from PM B.V. now come with a variety of cage options

★ By Lisa Eitel Leave a Comment

When building miniature linear-motion systems, design engineers can choose between ball and crossed-roller linear guides.  When applied to precision systems, most all of these linear guides have cages to prevent shifting of the anti-friction rolling elements during operation … especially when these linear guides are applied in exacting microscopy, manipulator, and image-scanner applications — for […]

Filed Under: Crossed-roller slides, Featured, Industry news, Linear bearings, Slides + guides (all) Tagged With: PM

THK roller LM guide type HRX for myriad applications and harsh environments

★ By Lisa Eitel Leave a Comment

A new Roller LM Guide Type HRX from THK America Inc. meets the demands of myriad applications and environments. The Type HRX boasts a duplex face-to-face structure (DF Structure) and a full roller design for resilient performance in even harsh settings. Features include a highly rigid, yet simple structure, caged rollers and an extensive dust […]

Filed Under: Applications, Crossed-roller slides, Featured, Slides + guides (all) Tagged With: THK

Why are cages used in crossed roller guides?

★ By Danielle Collins Leave a Comment

crossed roller guides

Crossed roller guides are non-recirculating linear bearings whose rollers are oriented in a “crisscross” pattern (each roller is turned 90 degrees relative to the one next to it) and move between two parallel guides with V-shaped grooves. Because the rollers don’t recirculate, these guides provide high load capacity and good stiffness, with smoother motion than […]

Filed Under: Crossed-roller slides, FAQs + basics, Featured

What are Hertz contact stresses and how do they affect linear bearings?

★ By Danielle Collins 1 Comment

Linear bearings that use balls or rollers to carry a load are subjected to Hertz contact stresses — a type of material stress that plays a significant role in determining the bearing’s load capacity and fatigue life. When two surfaces of different radii are in contact and a load is applied (even an extremely small load), […]

Filed Under: Applications, Ball + roller guides, Crossed-roller slides, FAQs + basics, Featured, Track roller (cam + wheel) guides

Linear motion trends in slides: Robotics and mobile designs lead the charge

★ By Lisa Eitel Leave a Comment

Demand for simple-to-install and pre-integrated linear-slide systems continues unabated … especially in applications only recently automated. Here’s the perspective of Matt Mowry, North American market manager for drylin products at igus: “We’ve supplied fully assembled and customized linear-slide tables … complete with motors and accessories. We’ve also supplied custom-extruded linear profiles and bearing liners to […]

Filed Under: Applications, Ball + roller guides, Crossed-roller slides, Featured, Linear bearings, Plastic + composite guides, Slides + guides (all), Track roller (cam + wheel) guides Tagged With: igus, pbclinear

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