Linear Motion Bearings And Their Growing Demands

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Recalling physics and its kinematics lessons Linear Motion is a motion

subjected to straight line or one dimension only. In the same way if we

talk about linear motion bearings which is also known as linear motion

guide ways or linear slide is an essential component in machine tool

whose main function is to provide a smooth movement in machine and

due to this high accuracy and precision is achieved. It requires rolling

components which are balls and rollers.

There are various types of Linear Motion Bearings which are:

• Sliding contact linear motion bearings: - It has a wide range of

applications as it is the most simple and cheapest bearings which has a

greater coefficient of friction as compared to other types of bearings.

So they are less consider in precise positioning applications. A thin film

can be obtained with the help of these bearings.

• Rolling element linear motion bearings: - It has a lesser friction

coefficient than sliding contact bearings as it utilize rolling components

such as balls and rollers by placing them between relatively moving

objects. Because of its advantages over sliding contact bearings it is

applicable in the machines where high accuracy and precise is needed.

Linear Motion Bearings And Their Growing Demands

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• Hydrostatic or aerostatic linear motion bearings: - It is required

when we need extremely accurate operations, it is very expensive and

difficult to manufacture as it does not have any mechanical contact

between its elements. It has a forcibly supply of pressurized fluid

between relatively moving objects by keeping one of them floating on

the fluid. It is basically classified into aerostatic or hydrostatic by the

fluid which is used.

• Magnetic linear motion: - With the help of its attracting or

repelling force it keeps one of the relatively moving objects floats. It has

a limited applications as due to electromagnetic force it is highly

expensive.

The linear motion bearings are in great demands as:

• It has highly accurate precise positioning as here the friction

contact is the rolling contact between two moving objects and the

coefficient is 1/50 traditional contact.

• It has a long life and high motion.

• Possibility of high speed of motion with low driven force as it has

very low frictional resistance so, it requires less force to move the load.

Linear Motion Bearings And Their Growing Demands

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• It can be easily installed, lubricated and can be interchangeable.

• It has loading capacity in all vertical or horizontal directions.

The linear motion bearings has a wide range of applications as they are

used in CNC machines, heavy cut machines, lathe machines, molding

machines, Grinding machines, etc.