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From The Collaborative International Dictionary of English v.0.48:
Jigging \Jig"ging\, n. (Mining) The act or using a jig; the act of separating ore with a jigger, or wire-bottomed sieve, which is moved up and down in water. [1913 Webster] Jigging machine. (a) (Mining) A machine for separating ore by the process of jigging. (b) (Metal Working) A machine with a rotary milling cutter and a template by which the action of the cutter is guided or limited; -- used for forming the profile of an irregularly shaped piece; a profiling machine. [1913 Webster]