Download e-book for iPad: Advanced Fixture Design for FMS by A.Y.C. Nee, K. Whybrew, A. Senthil kumar

By A.Y.C. Nee, K. Whybrew, A. Senthil kumar

ISBN-10: 1447121171

ISBN-13: 9781447121176

ISBN-10: 1447121198

ISBN-13: 9781447121190

Fixtures are an important to new production options and mostly dictate the extent of flexibleness a producing approach can in achieving. 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 structures. fresh advancements in layout method utilizing CAD are analysed intensive. Fixture layout is obvious as an inseparable a part of strategy making plans. the first target of a fixture process is to make sure that the half being synthetic may be made always in the tolerance laid out in the layout. a brand new approach to tolerance research is used to examine the suitability of position surfaces and the series of operations and is defined in detail.

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20 Clamping using a single resultant holding force Fixture Design Fundamentals 39 The first condition is that friction between the locators is sufficient to prevent the workpiece from sliding on the locators. In this case either locator A or C may be a centre of rotation. If C is a centre of rotation the workpiece may, for small movements, rotate about C in a counter-clockwise direction, permitting the workpiece to lose contact at B. The holding force must provide a clockwise moment about C to prevent this.

Support surfaces The need for fIXed or adjustable supports must be determined and surfaces for support identified. 22 Advanced Fixture Design for FMS This is influenced by: • • • • • • • location surfaces; clamping surfaces; tolerances on design dimensions; workpiece stiffness; magnitude and direction of machining forces; spatial relationship of the workpiece, the machine-tool structure and the machining envelope. fixturing sequence The above outputs can be combined into a fIxturing sequence from which concepts for fIxture layouts can be developed.

Geometric and mechanical control are concerned with practicalities of fixture design and dimensional control deals with the dimensional relationships between machined features. Good dimensional control is guaranteed if the workpiece is located on one of the pair of surface features related by a dimension while the second surface is machined. (This is axiom 7). While this ideal should be strived for, consideration of geometric and mechanical control may make it impossible to achieve. If surfaces not referred to by the dimension are used for location then manUfacturing tolerance stacks are inevitable.

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Advanced Fixture Design for FMS by A.Y.C. Nee, K. Whybrew, A. Senthil kumar

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