Jig (tool)

A bicycle frame building jig

A jig is a type of custom-made tool used to control the location and/or motion of parts or other tools.

Description

A jig's primary purpose is to provide repeatability, accuracy, and interchangeability in the manufacturing of products.^[1] A jig is often confused with a fixture; a fixture holds the work in a fixed location. A device that does both functions (holding the work and guiding a tool) is called a jig.

An example of a jig is when a key is duplicated; the original is used as a jig so the new key can have the same path as the old one. Since the advent of automation and computer numerical controlled (CNC) machines, jigs are often not required because the tool path is digitally programmed and stored in memory. Jigs may be made for reforming plastics.

Jigs or templates have been known long before the industrial age. There are many types of jigs, and each one is custom-tailored to do a specific job. Many jigs are created because there is a necessity to do so by the tradesmen. Some are made to increase productivity through consistency, to do repetitive activities or to do a job more precisely. Jigs may be well made for frequent use or may be improvised from scrap for a single project, depending on the task.

Some types of jigs are also called templates or guides. Jigs include machining jigs, woodworking jigs (e.g. tapering jig), welders' jigs, jewelers' jigs, and many others.

Drill jig

A drill jig is a type of jig that expedites repetitive hole center location on multiple interchangeable parts by acting as a template to guide the twist drill or other boring device into the precise location of each intended hole center. In metalworking practice, typically a hardened drill bushing lines each hole on the jig plate to keep the tool from damaging the jig.

Drill jigs started falling into disuse with the invention of the jig borer.

Since the widespread penetration of the manufacturing industry by CNC machine tools, in which servo controls are capable of moving the tool to the correct location automatically, the need for drill jigs (and for the jobs of the drill press operators who used them) is much less than it used to be.

PCB jig

Main article: in-circuit test

Printed circuit board (PCB) jigs are used to test PCBs. They have a dump board inside the jig which can find faults in the PCBs.

References

↑ Henriksen, p. 1.

Bibliography

Henriksen, Erik Karl (1973), Jig and fixture design manual, Industrial Press, ISBN 978-0-8311-1098-7.

External links

Wedge Operated Jig (The Wolfram Demonstrations Project)

Measuring and alignment tools

architect's scale beam compass calipers chalk box combination square compass coordinate-measuring machine drafting machine engineer's scale flat spline French curve jig laser level laser line level laser measuring tool lesbian rule measuring rod micrometer plumb-bob protractor ruler set square sliding T bevel spirit level steel square stencil straightedge T-square tape measure theodolite vise weighing scale winding sticks yardstick

Types of tools Cleaning Cutting and abrasive Forestry Garden Hand Machine and metalworking Measuring and alignment Power

Woodworking

Overviews

Forms

Woods

Soft	Cedar (Calocedrus, Cedrus) Cypress Douglas fir Fir Juniper Larch Pine Spruce Yew

Hard	Ash Alder Aspen Balsa Beech Birch Cherry Chestnut Cocobolo Ebony Elm Hazel Lignum vitae Linden (lime, basswood) Mahogany Maple Oak Padauk Plum Poplar Teak Totara Walnut Willow

Tools

Abrasives Axe Adze Chisel Clamp Drawknife Drill Float Mallet Milling machine Mitre box Moulding plane Plane Rasp Router Sandpaper Spokeshave Timber-framing Vise Winding sticks Wood scribe Workbench

Saws	Backsaw Bandsaw Bow Bucksaw Chainsaw Circular Compass Coping Crosscut Frame Fretsaw Jigsaw Keyhole Miter Rip Scroll Veneer Whipsaw

Geometry

Joints	Birdsmouth Bridle Butt Butterfly Coping Crown of thorns Dados Dovetail Finger Groove Halved Hammer-headed tenon Knee Lap Mason's mitre Miter Mortise and tenon Rabbet/Rebate Scarf Splice Tongue and groove

Profiles	Bead Bevel Chamfer Molding Ogee Ogive

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Metalworking

Machining and computing

Computer-aided engineering	2.5D CAD CAM G-code Numerical control (NC and CNC) Stewart platform

Drilling and threading	Die head Drill Drill bit Drill bit shank Drill bit sizes Drilling List of drill and tap sizes Tap and die Tap wrench Threading

Grinding and lapping	Abrasive Angle grinder Bench grinder Coated abrasives Cylindrical grinder Diamond plate Flick grinder Grinding Grinding dresser Grinding machine Grinding wheel Jig grinder Lapping Sanding Sharpening stone Spark testing Surface grinder Tool and cutter grinder

Machining	Boring Broaching Electrical discharge machining Electrochemical machining Electron beam machining Endmill Engraving Facing Hobbing Jig borer Machine tool Machining Metal lathe Milling cutter Milling machine Pantograph Photochemical machining Planer Reamer Rotary transfer machine Shaper Turning Ultrasonic machining

Machine tooling	Angle plate Chuck Collet Fixture Indexing head Jig Lathe center Machine taper Magnetic base Mandrel Rotary table Wiggler

Terminology	Cutting fluid Machining vibrations Speeds and feeds Swarf Tolerance Tool and die making Tramp oil

Authority control	NDL: 00574708

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