What is the difference between a functional test jig and a fixture?

Posted by yy on March 13th, 2020

The two words “jig” and “fixture” are easy to be confused or even misused because there is only one word difference. So what is the difference between testing jig and fixture?

1.Definition of jig

Jig is a large class of tools for woodworking, ironwork, fitter, machinery, electrical control and other handicrafts, mainly used as a tool to assist in controlling position or movement (or both). Because Taiwan was ruled by Japan for a long time, it became accustomed to the word "jig".

Jig classification: jig can be divided into three categories: process get-together jig, project test jig, and circuit board test jig. The process get-together jig includes gathering jig, welding jig, destruction jig, dispensing jig, irradiation jig, adjustment jig, and shear jig; and project test jig includes life test jig, packaging test jig, and environmental test jig , Jigs for optical test, jigs for shield test, jigs for sound insulation test, etc .; jigs for circuit board test mainly include ICT test jig, FCT function jig, SMT furnace jig, BGA test jig, etc.

Uses of jig: Jigs are produced because of business needs, including mechanical jigs, woodworking jigs, welding jigs, jewelry jigs, and other fields. Some types of jigs are also called "molds" or "assistances", the main purpose of which is to reproduce a certain part repeatedly and accurately. Many types of jigs are customized, and some are designed to increase productivity or make work more precise.

2, Definition of fixture

In a broad sense, any process in the process, the device used to quickly, easily and safely install the workpiece can be called a fixture. For example, welding fixture, inspection fixture,gathering fixture, machine tool fixture, etc. Among them, machine tool fixture is the most common, often referred to as fixture. When processing the workpiece on the machine tool, in order to make the surface of the workpiece meet the technical requirements such as the size, geometry and accuracy of mutual position with other surfaces, the workpiece must be installed (positioned) and clamped (clamped) before processing .

Fixture types can be divided into universal fixtures, special fixtures, adjustable fixtures, and combined fixtures according to their characteristics.

What is the difference between testing jig and fixture? to sum up: Although the two are similar in use, jig is mainly used for work and guidance tools; fixture is mainly used to hold tools in a fixed position. Some devices that have both functions (control and guidance tools) are also called jigs, but devices that only hold tools without guidance are called "fixtures" instead of "jigs." In the era of CNC systems, the use of jigs has been reduced.

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