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Mandrel
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== Uses == [[File:Mandrel 002.jpg|thumb|Pulley-driven mandrel used to hold lawn tractor cutting blades]] Mandrels are also used in industrial composite fabrication, such as in [[filament winding]]. During the manufacturing process, resin-impregnated filaments are wound around a mandrel to create a [[composite material]] structure or part. The structure is cured, and the mandrel is removed. One problem with this type of process is difficulty in removing the mandrel from the completed work. A mandrel with a changeable shape can be more easily extracted.<ref name="sm1">{{cite web|url=http://www.crgrp.com/technology/portfolio/mandrels.html|title= Smart Mandrels|access-date=2009-09-30|publisher=Cornerstone Research Group}}</ref> When heated above a certain temperature, the mandrel becomes elastic and can be manipulated into the desired shape and then cooled to become rigid again in the new shape. It can then be used in the filament winding process. Once the composite part is cured, the mandrel can be reheated until elastic and easily removed from the cured part. These types of mandrels can be used repeatedly.<ref name="sm2">{{cite web|url=http://www.crgrp.com/technology/overviews/mandrels.shtml|title= The Smart Mandrels Trapped Tooling Process|access-date=2009-09-30|publisher=Cornerstone Research Group}}</ref> A mandrel can also be made of a metal alloy that melts at low temperature. In this process, the composite is laid over the mandrel, heated to cure the material, and then the mandrel is removed by increasing the temperature to melt the mandrel, allowing it to drain. In the production of steel core used for flexible drives, the center wire upon which the subsequent layers are wound is referred to as a Mandrel. This "center wire" may itself be composed of either a single wire or layers, depending on the sizing of the finished product. A [[hole saw]] usually attaches to a mandrel, the latter being basically a drill bit with threads to secure the saw.
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