Wire shape, size and selection of the alloy (low carbon steel, stainless steel, aluminum or hard drawn) is where it all begins. Wire is typically purchased in coil form and is straightened and cut automatically on high-speed straightening and cutting machines to tolerances within ±0.010". In fact, the straightening and cutting aspect of springmaking has developed into a distinct technology. Spring and formed wire products have applications on bicycles, servomotors, valves, meters, automobiles, and equipment used by utilities. A coil spring is an open helical spring that offers resistance to a compressive force applied axially. Coil springs are usually coiled as a constant diameter cylinder. Typically compression springs, the most commonly used spring. The required load is reached by compressing the spring down to the matching height. KEYWORDS for this process: torsion, tension, compression