Jigs

A jig is a device used in manufacturing, woodworking, metalworking, and electronics to guide a tool or position a workpiece for precision operations. Jigs differ from fixtures in that a jig guides the cutting or drilling tool, determining the tool path, while a fixture merely holds the workpiece stationary.

In woodworking and metalworking, common jig types include drill jigs, routing jigs, dowel jigs, mortising jigs, and pocket-hole jigs. A drill jig, for example, locates and guides a drill bit to produce holes at exact locations and angles. Routing jigs control the path of a router to reproduce patterns or shapes. Jigs are often built to be used repeatedly, speeding setup and improving consistency.

Other uses of the term include fishing jigs, which are lures designed to resemble prey and include weights and hooks, and the jig as a traditional lively dance form and its characteristic music in 6/8 or 12/8 time.

Design considerations include rigidity, accurate alignment, clearance for tooling, and secure mounting. Automatic or computer-controlled environments employ CNC or modular jigs that can be reconfigured for different tasks. Proper use reduces human error, enhances safety, and supports mass production and repair work.