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Linear Motion Bearings and Transmissions Ltd

Tel: 01462 675 033

Fax: 01462 339 216

Bearings Related Articles

All About Bearings!

A bearing is any one of various machine elements that constrain the relative motion between two or more parts to only the desired kind of movement. This is usually to allow and promote free rotation around a fixed axis or free linear movement; it may also be to arrest any motion, such as by controlling the vectors of normal forces. Bearings may be classified according to the motions they allow and according to their principle of operation, as well as by the directions of applied loads they are able to handle.
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The Common Uses of Bearing Products

The first documented use of a bearing was in an axle assembly by the carriage maker and inventor Mr Phillip Vaughan in 1791. Mr Vaughan utilized ball bearings to do away with the direct contact between the drive shaft and axle in the carriages he manufactured which put an end to carriage axles wearing out as a result of the friction they were subjected to.
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The History and Development of Bearings

A very early type of linear bearing was some tree trunks laid down under wooden sleds. This technology may date as far back as the construction of the Pyramids in Egypt, though there has never been any definitive evidence to prove this theory. Modern linear bearings use a similar principle, they just use balls in place of rollers most of the time.
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The Linear Motor

A linear motor is an electric motor that has had its stator and rotor "unrolled" so that instead of producing a torque or rotation, it produces a linear force along its entire length. The most common mode of operation is as a Lorentz type actuator, in which the applied force is linearly proportional to the current and the magnetic field.
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What is a Linear Actuator?

A linear actuator is an actuator that creates motion in a straight line, as contrasted with circular motion of a conventional electric motor. Linear actuators tend to be used in machine tools and industrial machinery, in computer peripherals such as disk drives and printers, in valves and dampers, and in many other places where linear motion is desired. Hydraulic or pneumatic cylinders inherently produce linear motion; there are many other mechanisms that are used to provide a linear motion from a rotating motor.
Read about what a Linear Actuator is...

Lazy Susan Turntable Bearing

In conversation, most people tend to consider the subject of ball bearings or turntable bearings to be firmly in the domain of engineering. Clearly rolling and turntable bearings are a major part of the engineering industry, but it is quite surprising to know just how many applications these type of bearings have in our day to day lives.
Read about the Lazy Susan Turntable Bearing...

Types of Rolling Bearing in Common Use Today.

There are five types of rolling bearings that are used in rolling element bearings. These are balls, cylindrical rollers, tapered rollers, spherical rollers, and needles. LMB Linear Motion Bearings and Transmissions Ltd can supply them all.
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Rack and Pinion Gears.

A rack and pinion is a type of linear actuator that is made up of a pair of gears which convert rotational motion into linear motion. The circular gear is called the pinion and that engages teeth on a linear gear bar that is called a rack. Rotational motion applied to the pinion causes the rack to move, thus translating the rotational motion of the pinion into the linear motion of the rack.
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What is a Linear Motion Bearing?

A linear motion bearing or linear slide as it is sometimes called, is a bearing designed to provide free motion in one dimension. There are many different types of linear motion bearings. Motorised linear slides like machine slides, XY tables, roller tables and some dovetail slides are bearings that are moved by drive mechanisms. Not all linear slides are motorised though, and non-motorised dovetail slides, ball bearing slides and roller slides provide a low friction linear movement for equipment powered by inertia or by hand. All linear slides give linear motion based on bearings, whether they are ball bearings, dovetail bearings, linear roller bearings, magnetic or fluid bearings. XY Tables, linear stages, machine slides and other advanced slides use linear motion bearings to give movement along both X and Y multiple axis.
Read about what a Linear Motion Bearing is...

Power Transmissions

Power transmission is simply a way of moving energy from the location that it was generated, to a location where the energy can be applied to performing a useful task.
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Linear Motion

Linear motion, also called rectilinear motion is motion along a straight line, and can therefore be described mathematically using only one spatial dimension. The linear motion can be of two types: uniform linear motion with constant velocity or zero acceleration; non uniform linear motion with variable velocity or non-zero acceleration. The motion of a particle, a point-like object along a line can be described by its position x, which varies with t (time). An example of linear motion is an athlete running 100m along a straight track.
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Thin Section Bearings

A bearing is considered to be a thin section bearing when the bore diameter is greater than four times the radial cross section. Within any thin section ball bearing series, the cross section remains constant as the bore diameter changes. Typically the cross section is twice the ball diameter, and nominal dimensions are given in imperial measurements.
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All About Ball Screws

A ball screw is essentially a mechanical linear actuator that translates rotational motion to linear motion with very little friction.
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The Roller Screw

A roller screw, which is also referred to as a planetary roller screw or a satellite roller screw, is a low friction precision screw type actuator. It is also a mechanical device for converting rotational motion into linear motion, or vice versa. Planetary roller screws are used as the actuating mechanism in many electro mechanical linear actuators. Due to the screws complexity the roller screw is quite an expensive actuator, but may be more suitable for high precision, high speed, heavy load, long life and heavy use applications.
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Granite for Inspection Tables

LMB Linear Motion Bearings and Transmissions Ltd use granite for their quality inspection surface as engineers have traditionally used polished granite surface plates to establish a plane of reference, since they are relatively impervious and inflexible. Sandblasted concrete with a heavy aggregate content has an appearance that is quite similar to rough granite, and is often used as a substitute when use of real granite is impractical. A most unusual use of granite was in the construction of the rails for the Haytor Granite Tramway in Devon, England, in 1820. Granite block is usually processed into slabs and after can be cut and shaped by a cutting center.
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Leadscrews and their uses

A leadscrew is the most popular name given to this screw that is designed to translate turning motion into linear motion. Leadscrews are also known as a lead screw, a power screw or a translation screw. You will find leadscrews in Linear actuators, machine slides, vises, presses, and jacks of all kinds. Leadscrews are manufactured in exactly the same way as other thread forms and a lead screw can be used in conjunction with a split nut.
Read about the Leadscrew and its uses...

Life Without Bearings

We take so many things in life for granted! As usual I woke up this morning and turned on my bedside lamp that is mounted on a revolving base, I got out of bed and opened my bedroom door, ran a bath, went downstairs to make a cup of coffee and drove to work. Sounds like any other day, but I got to thinking about how many of my activities were made easier or even possible because of the ball bearing and where we would be in a world without this revolutionary invention.
Read about what life would be like without ball bearings...

Linear and Rotary Motion Explained

Linear motion is the straight movement of something whereas rotary motion is the circular movement.

A good example of something that many of us use on a daily basis that has both forms of motion is a car engine. The piston will be moving up and down, this is linear motion, and the crankshaft turns it into rotary motion.
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Linear Stages and Rotary Tables

Directly driven HIWIN rotary tables provide versatile applications due to their backlash-free, very rigid structure. Upon desire, they are also provided as a complete system with amplifier.
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Linear Ball and Roller Cages

Cages are typically used to secure the balls in a conrad style ball bearing. In other construction types they may decrease the number of balls depending on the specific cage shape, and thus reduce the load capacity. Without cages the tangential position is stabilized by sliding of two convex surfaces on each other. With a cage the tangential position is stabilized by a sliding of a convex surface in a matched concave surface, which avoids dents in the balls and has lower friction. Caged roller bearings were invented by John Harrison in the mid 1700s as part of his work on chronographs. Caged bearings were used more frequently during wartime steel shortages for bicycle wheel bearings married to replaceable cups.
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Crossed Rollerways and X, Y, Tables

LMB Transmissions supply practically every type of bearing for rotational and linear motion. We are therefore in a position to meet almost any customer requirement both technically and economically. The catalogue link above called 'Precision Rail Guides' covers the our range of precision rail guides and accessories. Precision rail guides are highly accurate products for linear motion and are therefore ideally suited for use in a wide variety of machine tools, machining centres, handling systems and special machinery as well as measuring and testing equipment.
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Flat Cage Guides

Flat cage guides consist of guiding rails different designs and material as well as flat cages with a variety of rolling elements (needle rollers or cylindrical rollers). Flat cage guides are especially applicable for small construction sized constructions. They possess a high stiffness and load carrying capacity as well as low friction and high precision.
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Codex Ball Bearing Units

Ball bearing units consists of pre-lubricated sealed ball bearings and a housing which varies in shape. They are capable of aligning themselves efficiently using the spherical fitting surface between the bearing and housing, effectively preventing overloads due to misalignment.
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Codex Deep Groove Ball Bearings

Deep groove ball bearings are available in a variety of sizes, and are the most popular of all rolling bearings. This type of bearing supports radial load and a certain degree of axial load in both directions simultaneously.
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Codex Cylindrical Roller Bearings

Cylindrical roller bearings have high radial-load capacity and moderate thrust loads. They contain rollers which are cylindrically-shaped, but are not true cylinders. Instead, these rollers are crowned or end-relieved to reduce stress concentrations. This geometry results in low friction and allows for high-speed applications. Cylindrical roller bearings are commonly available in precision grades such as RBEC-5, a classification from the Roller Bearing Engineers Committee (RBEC). RBEC ratings describe the accuracy and tolerance range for different types of bearings. As a rule, the higher the RBEC number, the tighter the bearing tolerances. Typically, cylindrical roller bearings are lubricated with oil, which also serves as a coolant.
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Codex Tapered Roller Bearings

Tapered roller bearings are designed such that cup, cone and rollers have tapered surfaces whose apexes converge at a common point on the bearing axis. Along with metric series bearings, inch series bearings are also available. This type of bearing is suitable for applications that involve heavy or impact loading.
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Codex Needle Roller Bearings

Needle roller bearings are small in sectional height, therefore useful in making machinery smaller and lighter. This type of bearing is used in a wide range of machinery, such as automobiles, motor cycles, electric machines, machine tools, aerospace and office equipment.
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Codex Angular Contact Ball Bearings

Angular contact bearings are designed such that a contact angle between the races and the balls is formed when the bearing is in use. The major design characteristic of this type of bearing is that one, or both of the ring races have one shoulder relieved, or higher than the other. In order for these bearings to function properly, they must be assembled with a thrust load. This loading (or preload) creates a line of contact (or contact angle) between the inner race, the ball and the outer race. The preload can be built into the bearing or created when the bearing is inserted into an assembly. The contact angle varies from 15 to 40 and is measured relative to a line running perpendicular to the bearing axis. Angular contact bearings are unidirectional thrust bearings that can withstand heavy thrust loads and moderate radial loads.
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Codex Spherical Roller Bearings

Spherical roller bearings feature a large load rating and self-aligning capability. This type of bearing is suitable for low or medium speed applications which involve heavy or impact loading.
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Codex Thrust Ball Bearings

Thrust ball bearings are divided into single and double direction types. The former is able to accommodate axial load in one direction, while the latter is able to accommodate it in both directions. Neither is suitable for applications that involve radial load or high-speed rotation.
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Codex EXSEV

The Codex line of EXSEV (Extreme Special Environment) bearings were specifically engineered for the tough applications such as those involving high temperatures, corrosive solutions and atmospheres, dry lubrication, low particle emissions, non-magnetic environments and high vacuum conditions. Codex meets the challenge with specialty steels, silicon nitride bearing components and advanced dry film coatings for protection and low particle emissions.
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Linear Bearings

A linear-motion bearing or as it is sometimes called, a linear slide is a bearing manufactured to provide free motion in one dimension. There are many different kinds of linear motion bearing and this group of products is usually separated into two sub-categories, that is rolling-element and plane.
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Rolling Bearings

A bearing arrangement does not only consist of rolling bearings but includes the components associated with the bearings such as the shaft and housing. The lubricant is also a very important component of the bearing arrangement because it has to prevent wear and protect against corrosion so that the bearing can deploy its full performance. Beside these, the seal is also a very important component, the performance of which is of vital importance to the cleanliness of the lubricant. Cleanliness has a profound effect on bearing service life - which is why lubricants and seals have become part of the business.
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LMB Transmissions Ltd : Linear & Rotary Motion Components

Tel: 01462 675 033 - Email: info@lmbearings.com - UK Company Reg. No. 08051738