Editing Mandrel (section)

=== In machining ===
An example of one type of mandrel is a shaped bar of metal inserted in, or next to, an item to be machined or bent in a certain pattern, e.g. in [[tube drawing|drawing metal tubing]]. [[Exhaust pipe]]s for automobiles are frequently bent using a mandrel during manufacture. The mandrel allows the exhaust pipes to be bent into smooth curves without undesirable creasing, kinking, or collapse. Molten glass may also be so shaped.  

A [[Chuck (engineering)|chuck]] is used on a [[Lathe (tool)|lathe]] to hold pieces of wood, metal or plastic to be machined as they are turned. In this way, rods can be threaded, furniture legs are turned to a desired shape, and irregularly-shaped objects can be given a round shape. Several types of mandrel are used with lathes. Original expanding mandrels have a slightly tapered wedge that will expand to hold the item.

A third type of mandrel is that which is used to hold circular saw blades, buffing wheels (used for polishing), and sanding discs onto [[drill]]s, circular saws, and similar power tools. A mandrel of this type generally consists of a cylinder, threaded on one end, with a [[Washer (hardware)|washer]] [[Brazing|brazed]] onto the threaded end and an accompanying [[screw]] and second washer used to clamp the circular saw blade, sanding media, or other rotary tool onto the mandrel.

While most mandrels are driven by direct connection to an [[electric motor]] or other engine, other mandrels may be driven by attachment to a bearing-supported,  [[pulley]]-driven shaft.