By Yiming (Kevin) Rong, Samuel Huang
Fixtures--the part or meeting that holds a component present process machining--must be designed to slot the form of that half and the kind of machining being performed. This publication discusses the basics of Computer-Aided Fixture layout (CAFD) options and covers fixture making plans, fixture layout (both modular and devoted fixtures), fixture layout verifications, and the general integration with CAD/CAM. The booklet indicates how CAFD could lead on to an important relief of product and technique improvement time and creation price, and the way CAFD can raise caliber insurance via simulation and science-based technical specification and price estimation in company quoting, specially in present supplier-based production. It additionally presents case learn examples. * This e-book offers a complete resolution of CAFD, together with making plans, layout, and layout verification* useful and complete theoretical research of fixturing from genuine business software initiatives* Introduces the combination of fixture layout and research with CAD/CAM in order that particular geometric details might be processed and intricate fixture designs could be designed and analyzed
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Additional resources for Advanced Computer-Aided Fixture Design
In production planning for economic runs, parts cannot always be machined dimensionally as shown on the blueprint; the setup datum may not coincide with the design datum. Hence, certain 26 CHAPTER 2 Computerized Manufacturing Setup Planning blueprint dimensions can be obtained only indirectly. As a result, manufacturing variations will stack up. This phenomenon is commonly known as tolerance stack-up. Although the other types of errors cannot be eliminated, Type VII errors can sometimes be reduced, if not eliminated, via setup planning.
Usually, the direction and value of a deterministic error can be predicted because its regularity can be found. However, because the regularity of a random error does not exist, its direction and value cannot be predicted. When performing a worst-case manufacturing error analysis, random errors are always summed, whereas deterministic errors might be summed or canceled out. Manufacturing errors can also be classified based on error sources. To manufacture a part, the workpiece has to be located on the machine tool in a definite manner so that features of the part can be machined.
As a result, the toleranced feature deviates from S0 to a new plane S described by the equation Ax + By + Cz + D = 0. Due to the presence of rotation error, points on plane S will have different z coordinate values. Because the bottom surface is parallel to plane S, points on the bottom surface will also have different z coordinate values. Ignoring machining errors, the machined top surface will be parallel to the ideal datum but not the bottom surface. If the part is located such that the difference between the points having the maximum and minimum z coordinate values (on plane S) is less than δ, the parallelism tolerance can be assured.
Advanced Computer-Aided Fixture Design by Yiming (Kevin) Rong, Samuel Huang