Word forms: (regular plural) mandrels
(Mechanical engineering: Manufacturing and assembly) A mandrel is a spindle for supporting a workpiece when it is being machined. ⇒ Conical and curved parts can be made by spinning them on a rotating mandrel. ⇒ A mandrel is a workholder for turning that fits the inner diameter of workpieces. ⇒ A mandrel is a spindle for supporting a workpiece when it is being machined.
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