By A.Y.C. Nee, K. Whybrew, A. Senthil kumar
Fixtures are the most important to new production suggestions and principally dictate the extent of suppleness a producing process can in attaining. Advanced Fixture layout for FMS presents a scientific foundation for the choice and layout of fixturing structures. It offers a evaluation of the present state-of-the-art of versatile and reconfigurable fixturing platforms. fresh advancements in layout technique utilizing CAD are analysed extensive. Fixture layout is visible as an inseparable a part of approach making plans. the first goal of a fixture approach is to make sure that the half being synthetic will be made constantly in the tolerance laid out in the layout. a brand new approach to tolerance research is used to envision the suitability of position surfaces and the series of operations and is defined in detail.
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Extra info for Advanced Fixture Design for FMS
The reference surface must be located by three locators. 14. As can be seen, the set of three locators is not on the largest surface. This violates the requirements for geometric control. Operator skill can compensate for poor geometric control but poor dimensional control will always give dimensional variation in the product and in order to satisfy the design specification preference is given to dimensional control. 14 Location for dimensional control Axiom 9 When the requirements of geometric and dimensional control conflict, precedence should be given to dimensional control.
E. machining, heat-treating, plating, assembly, inspection, etc. Phase three examines details of each machining operation and the manufacturing sequence and evaluates tentative designs produced during phases one and two in relation to the manufacturing processes. Consideration of workpiece stability and action of cutting forces etc. are introduced here. Phase four is concerned with operator fatigue, safety and the convenience of using the fIXture. Phase five is the fmal analysis of the tentative designs and selection of the fmal fIXture design on the basis of overall cost, workpiece quality and production quantity.
Good dimensional control exists when there are no tolerance stacks and when workpiece variation and irregularities do not interfere with the correct location of the workpiece. ) Axiom 7 To prevent tolerance stacks locators must be placed on one of the two surfaces which are related by the dimension on the workpiece drawing. Axiom 8 When two surfaces are related by a geometric tolerance of parallelism or perpendicularity. the reference surface must be located by three locators. 14. As can be seen, the set of three locators is not on the largest surface.