variants: or less commonly mandril
Definition of mandrel
1a : a usually tapered or cylindrical axle, spindle, or arbor inserted into a hole in a piece of work to support it during machining
b : a metal bar that serves as a core around which material (such as metal) may be cast, molded, forged, bent, or otherwise shaped
2 : the shaft and bearings on which a tool (such as a circular saw) is mounted
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