6. (Mach.) (a) A small machine or handy tool; esp.: (Metal Working) A
contrivance fastened to or inclosing a piece of work, and having hard
steel surfaces to guide a tool, as a drill, or to form a shield or
templet to work to, as in filing. (b) (Mining) An apparatus or a
machine for jigging ore.
Drill jig, a jig for guiding a drill. See Jig, 6 (a). -- Jig drilling,
Jig filing (Metal Working), a process of drilling or filing in which
the action of the tool is directed or limited by a jig. -- Jig saw, a
sawing machine with a narrow, vertically reciprocating saw, used to cut
curved and irregular lines, or ornamental patterns in openwork, a
scroll saw; -- called also gig saw.