What Are The Different Types Of Linear Bearings?

Linear bearings, or linear slides as they are popularly known

, are designed to render free motion in a single dimension. Those involved in the industry of machinery need to be concerned about these bearings as they have several applications across various industries. The best way to begin your knowledge gaining quest would be to learn about various categories available and how they are different from one another. This is important because their application depends on their category, as it this that determines the type of motion they can provide. Here is some important information regarding different categories in linear slides:

Linear bearings have been categorised based on their operation, motion and the direction in which they can support a weight. The most commonly known category is the rolling element bearing. It is composed of an outer race, an inner race, a cage and a rolling element. The components are designed in such a manner that they render space, guidance and support to the rolling elements. Metal to metal contact is its most common feature. Its important to note that rolling element bearings cannot run without lubrication. They are not great at handling contamination and are in need of seals.

Plain bearings are designed straight with flanges. Although they are quite similar in design to that of the rolling element bearing, they slide without ball bearings. They can be further divided into bronze and plastic bearings. It is ideal for light load applications and is known to render a perfectly effective linear motion system. In contrast to rolling element bearing, they handle contamination pretty well and do not need scrapers or seals for proper functioning. The plastic versions of this bearing dont require lubrication. These linear bearings are less rigid in comparison to the rolling element bearing and are capable of handling a wider range of temperatures.

Dovetail linear bearings are designed from cast iron but its also possible to construct them from acetal, stainless steel or hard coat aluminum. It has a stationery base and also a moving carriage just like any other category of bearings. A channel in the shape of dovetail protrudes, locking itself into a linear base through the groove that is correspondingly shaped. This kind of fixture allows for a linear movement that is free. A dovetail table can be created by attaching a platform to the dovetail slide. This way, the bearings could be used for load carrying.

The last and among the popular choices is the ball bearing slide. This one offers a motion that is both smooth and precise in its journey along a single axis. The ball bearings that are accommodated in the linear base aid this motion. The self lubrication properties of these linear bearings contribute towards increasing the reliability of this category of slides. Now that you are equipped with all the information you need, perform a careful analysis. Once you make a careful comparison, you could be sure of which category to choose for your specific application. The right choice could save you a lot of money and effort.

by: adair sawyer

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