Eieio
August 25th, 2009, 07:24 PM
A jig is any of a large class of tools in woodworking, metalworking, and some other crafts that help to control the location or motion (or both) of a tool. Some types of jigs are also called templates or guides. The primary purpose for a jig is for repeatability and exact duplication of a part for reproduction. 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. In the advent of automation and CNC machines, jigs are not required because the tool path is digitally programmed and stored in memory. Jigs may be made for reforming plastics, and also for use in reproduction of materials. This also includes templates.
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 to increase productivity, to do repetitious activities and to do a job more precisely. Because jig design is fundamentally based on logic, similar jigs used in different times and places may have been created independently.
Jigs include machining jigs, woodworking jigs (e.g. tapering jig), welders' jigs, jewelers' jigs, and many others.
A jigsaw is called so because it is used to cut arbitrary curves used in jigs.
Difference between a jig and a fixture
The terms "jig" and "fixture" are often confused. A jig locates on the work and guides a tool. 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. A device that only holds work and does not guide a tool is properly called a fixture, not a jig. The CNC era has reduced the need for jigs, whereas fixtures are still commonly used.
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 to increase productivity, to do repetitious activities and to do a job more precisely. Because jig design is fundamentally based on logic, similar jigs used in different times and places may have been created independently.
Jigs include machining jigs, woodworking jigs (e.g. tapering jig), welders' jigs, jewelers' jigs, and many others.
A jigsaw is called so because it is used to cut arbitrary curves used in jigs.
Difference between a jig and a fixture
The terms "jig" and "fixture" are often confused. A jig locates on the work and guides a tool. 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. A device that only holds work and does not guide a tool is properly called a fixture, not a jig. The CNC era has reduced the need for jigs, whereas fixtures are still commonly used.