Mandrel n. (Mach.) (a)
A bar of metal inserted in the work to shape it, or to hold it, as in a lathe, during the process of manufacture; an arbor.
The live spindle of a turning lathe; the revolving arbor of a circular saw. It is usually driven by a pulley. (Written also manderil and mandril)
Mandrel lathe, a lathe with a stout spindle, adapted esp. for chucking, as for forming hollow articles by turning or spinning.