Man·drel 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. (b) 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.
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