When a linear guide, such as a round shaft or profiled rail, deflects or sags, the bearings that travel along the guide experience edge loading (a higher load concentrated at the ends of the bearing), which can cause rough, irregular movement, increased wear, and reduced bearing life. And when a linear guide is incorporated into […]
What causes plain bearing wear?
For rolling element bearings, the L10 life calculation is an easy way to determine the bearing’s expected travel life. But for plain bearings, determining life expectancy is not so straightforward. Plain bearing life is based on the amount of wear the bearing experiences, which depends on factors that are unique to each application, such as […]
Can plain bearings be used for cantilevered loads?
There are few linear motion applications in which the load is perfectly centered over the supporting bearing. On the contrary – the majority of applications involve loads that are cantilevered, meaning they are offset from the bearing and induce a moment load. In this context, the term “bearing” can mean a single bearing or a […]
What limits linear bearing speed? (Part 2)
In part 1 of this series on bearing speed, we looked at the factors that limit the speed of linear recirculating bearings. In this segment, we’ll look at the factors that limit the speed of linear plain bearings. Linear plain bearings operate with sliding contact between the two bearing surfaces, so the limitations encountered with […]
Dissipating static electricity in urethane rollers and wheels
Contributed case study courtesy Plan Tech || Dissipating static electricity in urethane rollers and urethane wheels by using an anti-static additive. Static electricity is an invisible field of protons, neutrons, and electrons found in anything that has potential to move. Each atom has its own properties and characteristics. One of these properties is an electrical charge. […]
Which linear guides are interchangeable?
The need to replace a linear guide in an existing machine or assembly can arise for any number of reasons: to improve the stiffness of the assembly by changing to a bearing with higher preload, or to accommodate unforeseen space constraints by using a different bearing type or style. And sometimes, a linear guide needs to be replaced […]
Low-cost FDA/USDA/3A dairy compliant Water Dog linear slides
FDA/USDA/3A-Dairy compliant, Water Dog Sliders from LM76 feature Corro-Slick coated 300 series stainless steel rails and contoured WDX Polymer blocks. Water Dog Sliders can be washed down with the most aggressive chemicals and caustic foaming agents and have an operating temperature range of – 400O to +180 OF. Quiet, low maintenance Water Dog Sliders can be […]
What is stick-slip?
Stick-slip, also referred to as “stiction,” is the bane of engineers and machine builders who need smooth, precise motion. Simply put, it’s the jerkiness that can plague both plain and recirculating linear bearings when they transition from standstill to motion. Here’s why stick-slip happens… When two objects slide against each other, friction works against their motion. […]
What is a PV rating?
When discussing bearing life, what comes to mind for most engineers is the standard L10 bearing life equation. But this equation was developed for bearings with rolling balls. (A similar equation exists for bearings that use rollers rather than balls.) For plain bearings, which have no rolling elements, determining the suitability of the bearing for a […]
A guide to plain bearing materials in linear motion applications
One of the benefits of plain linear bearings is their simplicity. Especially when compared to recirculating bearings, plain bearings are easy to specify, install, maintain, and replace. But don’t let that simplicity fool you. Choosing the wrong bearing, or more specifically, the wrong bearing material, can result in poor performance, degradation of the bearing, or […]
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