The term linear guide covers several categories of products, from plain bearings to ball bushings and recirculating roller bearings. To compound the potential for confusion, many terms are used interchangeably, or are so generic (take linear guide for example) that they could refer to any one of several different products. And this doesn’t apply to just […]
When should you use dual guide rails?
Linear guide rails and bearings offer high stiffness and good travel accuracy. And they can support not only downward, upward, and side loads, they can also withstand overhung, or moment loads. Of course, the larger the linear rail and bearing system, the more moment capacity it has, but the arrangement of the bearing raceways—face-to-face or back-to-back—also […]
Tips for preventing linear bearing corrosion
Corrosive environments can include anything from detergents and chemicals for washdown (the high-pressure cleaning of equipment), to acid baths and their related vapors, to chemicals in food processing. Because profiled linear rails, round shafts, and ball screws are made primarily from steel components, they’re highly susceptible to corrosive agents, which can quickly cause rust, pitting, […]
What are miniature profiled rails?
Profiled rails have high load-carrying capacity for their size. But when smooth, precise motion is needed and the load being moved is not very high, they can be overkill for the application. That’s why most profiled linear guide manufacturers now make miniature versions, with many of the same performance benefits and features of standard sized […]
How to calculate hole spacing for joined linear guide rails
There are several reasons that a linear guide rail may be supplied in multiple sections rather than in one piece: the overall length is longer than the maximum offered by the manufacturer, the machine design or other space constraints don’t allow installation of a single piece in the length needed, or the risk of damage […]
How to calculate hole spacing for linear guide rails
Profiled linear guides—whether profiled rails, cam roller guides, shaft support rails, or plain bearing guides—are typically manufactured with evenly spaced mounting holes that allow them to be secured to a machine base or work surface. For rigidity and integrity of the rail, there’s often a minimum distance, specified by the manufacturer, that must be maintained […]
Seven Interchange Tools for Linear Guides and Bearings
In linear motion, there are few types of components that are truly interchangeable—that is, where a product from one manufacturer is a dimensional and technical replacement with a product from another manufacturer. In fact, only linear ball bearings (bushings) and shafts are commonly interchangeable between manufacturers, with very few dimensional and technical differences. Not only […]
Ball rail systems: twice the service life and high travel accuracy
The patented entry zone of the new BSHP ball runner blocks from Rexroth improves travel accuracy and work piece quality while greatly increasing load capacities and service life. These runner blocks are available in most sizes, versions, and accuracy classes. BSHP ball runner blocks are 100% interchangeable into existing profiled rail applications using the same […]
Round shaft or profiled rail for linear motion? How to choose
Updated May 2019 || When designing a linear motion system, engineers have two primary choices in recirculating linear guides — round shaft or profiled rail. Choosing the wrong linear motion system can be a costly mistake, resulting in design or structural changes, poor machine performance, or oversized components with higher costs. Although both round shafts and […]
Ball Chains: Two things you might not know
Radial bearings have used ball cages for nearly a century, but this technology was only introduced to profiled rail guides within the last two decades. THK pioneered the way, launching its Caged Ball® LM Guide in 1996, and other profiled rail manufacturers soon followed suit with ball chain and ball spacer designs. Now, virtually every style […]
