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Basics of Magnetism

4/12/2015

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Magnetic tools are essential for various machining processes. Any movement can affect the precision and resulting quality of a work piece. These tools ensure that work pieces stay in place during a process. Magnetic table allow for convenient securing and unlocking of work pieces. A simple turn of a knob or flip of a switch can activate or deactivate the magnet. The use of a magnetic tool is very straightforward.

There two main types of magnetic tools, the permanent and the electromagnetic tools. Both types have advantage and disadvantages. An electromagnet requires electricity for it to generate magnetic power. A permanent magnet does not require electricity which helps in lowering the cost of operation. The problem with a permanent magnet is that chips and fragments from iron and other metals can stick to the magnet and become very hard to remove because its magnetic force cannot be turned off.

In order to further understand the main difference between the two, it is important to learn about the basics of magnetism. During the ancient times, man discovered a special type of rock called a lodestone that pulled other types of rocks and materials such as iron towards it. The pulling force is called magnetism. The objects that exert this type of force are called magnets.

Permanent magnets are materials that maintain their magnetism regardless of the surroundings. A magnetic force constantly exist between permanent magnets.

Temporary or soft magnets are materials that are attracted to magnets but are not permanent magnets themselves. An example is iron. Non-magnetic materials are materials that does  not react to magnet. Examples include wood, paper and plastic.

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A Mechanical World

4/6/2015

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Every moving mechanical contraption can be identified as a machine. Machines have varying levels of simplicity or complexity. It can be small or large. A screw and an automobile are both machines. The modern world is made up of all types of machines.

The refrigerator at home which helps preserve food and keep it safe for consumption for an extended amount of time is a machine. A sewing machine used to provide one of the most basic needs, clothing, is a machine. Compressors, cranes, engines , hoists,
polishing equipment, printing presses, pumps, turbines and watches are all machines.

Machines are needed to create other machines. These machines are called machine tools which are primarily used to shape materials or work pieces into special forms and shapes. Modern machine tools are automated. Large-scale machining operations use computers to monitor operation sequences.

Boring machines, drill, presses, lathes, milling machines, planers and sharpeners are examples of machine tools. The development of stronger and more durable material for work pieces has forced many machine tools to evolved. Laser cutters are one of the modern machine tools used for materials that the more traditional machine tools are incapable of cutting.


Robots are among the most sophisticated machines which are commonly used  in mass production assembly lines. These advanced machines perform tasks with utmost accuracy and care. A robot is able to pick up a work piece, put it in proper position, perform a desired machining operation and then send the work piece along the assembly line for further processing.

Despite its advantages in terms of efficiency and quality, the complexity involved in the maintenance of robots makes it impractical for low volume operations.

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