Spring (device)
A spring is a flexible elastic object used to store mechanical energy. The most common types of spring are helical spring, coil spring (at left), and leaf spring, and they are commonly made out of steel or brass. (See also shock absorber.)
A belleville spring is a disc shaped spring commonly used to apply tension and also in the initiation mechanism of pressure-activated landmines.
The image at left is a special kind of spring known as a slinky.
In physics, a spring can have potential energy. Hooke's Law of elasticity states that the extension of an elastic spring is linearly proportional to its tension.
Custom fabrication of springs
The fabrication of springs is rather simple. A material easily available are piano strings, that are made of steel. To make the spring, use a stud bolt, block it in a drill rotating counter clock-wise while maintaining the string firmly with a metallic device while letting the string go out little by little
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