jigs - DEFINATION Jigs and fixtures are devices used to...

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DEFINATION Jigs and fixtures are devices used to facilitate production work making interchangeable pieces of work possible at a savings in cost of production. A jig is a guiding device and a fixture a holding device. Jigs and fixtures are used to locate and hold the work that is to be machined. These devices are provided with attachments for guiding, setting, and supporting the tools in such a manner that all the work pieces produced in a given jig or fixture will be exactly alike in every way.
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ELEMENTS OF JIGS AND FIXTURES LOCATERS :It is used to establish and maintain the position of the part in the fixture by constraining the movement of the part. CLAMPS:It is a force actuating mechanism of jigs and ficture.The forces exerted by the clamp holds the part securely in fixture. SUPPORT:It is a fixed or adjustable element.It is used to prevent or constrain deformation.
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FIXTURE BODY Fixture body, or tool body, is the major structural element of a fixture. It maintains the spatial relationship between the fixturing elements mentioned above , viz., locators, clamps, supports, and the machine tool on which the part is to be processed.
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General Requirements of a Fixture In order to maintain the work piece stability during a machining process, an operational fixture has to satisfy several requirements to fully perform its functions as a work holding device. The following constraints must be observed while designing a viable fixture:
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DETERMINISTIC LOCATION: A work piece is said to be kinematically restrained when it cannot move without losing contact with at least one locator. The work piece is constrained by a set of appropriately placed locators so that it is presentable for the machining operation. Locating errors due to locators and locating surfaces of the work piece should be minimised so as to accurately and uniquely position the work piece within the machine coordinate frame.
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TOTAL CONSTRAINT A work piece should be fully constrained at all
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This note was uploaded on 06/28/2011 for the course MECHANICAL 1 taught by Professor Mks during the Spring '11 term at Institute of Engineering.

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jigs - DEFINATION Jigs and fixtures are devices used to...

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