By Yiming (Kevin) Rong, Samuel Huang
Fixtures--the part or meeting that holds an element present process machining--must be designed to slot the form of that half and the kind of machining being performed. This booklet discusses the basics of Computer-Aided Fixture layout (CAFD) recommendations and covers fixture making plans, fixture layout (both modular and committed fixtures), fixture layout verifications, and the general integration with CAD/CAM. The booklet indicates how CAFD could lead on to an important aid of product and technique improvement time and construction price, and the way CAFD can raise caliber coverage via simulation and science-based technical specification and value estimation in enterprise quoting, specially in present supplier-based production. It additionally presents case research examples. * This e-book offers a complete answer of CAFD, together with making plans, layout, and layout verification* sensible and accomplished theoretical research of fixturing from genuine commercial software tasks* Introduces the mixing of fixture layout and research with CAD/CAM in order that unique geometric info might be processed and complicated fixture designs should be designed and analyzed
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Extra info for Advanced Computer-Aided Fixture Design
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. 5) where G(x,y) = 0 is the equation for the contour of the machined feature and is either continuous (such as a circle) or piecewisely continuous (such as a polygon). Let zmax and zmin be the solutions for Eq.
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.
The surface being controlled must reside within the profile tolerance zone to be accepted. The tolerance zone for the profile of a surface is the region constricted by the two enveloping surfaces consisting of spheres whose diameters equal to the tolerance value δ. The profile of a surface can be defined in various ways, according to the shape and size of the part. Common applications for profile of a surface control including the control of the size, orientation, and form of the following (Krulikowski 1998): • • • Planar, curved, or irregular surfaces Polygons Cylinders, surfaces of revolution, or cones Whereas only one rotational angle contributes to the locating errors in the control of the profile of a line, two orthogonal rotational angles contribute to the locating errors in the control of the profile of a surface.