NDLI: Modeling of Geometric Variations for Line-Profiles

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Modeling of Geometric Variations for Line-Profiles

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Davidson, Joseph K. Shah, Jami J.
Copyright Year	2012
Abstract	The geometric variations in a tolerance-zone can be modeled with hypothetical point-spaces called Tolerance-Maps (T-Maps) for purposes of automating the assignment of tolerances during design. The objective of this paper is to extend this model to represent tolerances on line-profiles. Such tolerances limit geometric manufacturing variations to a specified two-dimensional tolerance-zone, i.e., an area, the boundaries to which are curves parallel to the true profile. The single profile tolerance may be used to control position, orientation, and form of the profile. In this paper, the Tolerance-Map (Patent No. 6963824) is a hypothetical volume of points that captures all the positions for the true profile, and those curves parallel to it, which can reside in the tolerance-zone. The model is compatible with the ASME/ANSI/ISO Standards for geometric tolerances. T-Maps have been generated for other classes of geometric tolerances in which the variations of the feature are represented with a plane, line or circle, and these have been incorporated into testbed software for aiding designers when assigning tolerances for assemblies. In this paper the T-Map for line-profiles is created and, for the first time in this model, features may be either symmetrical or nonsymmetrical simple planar curves, typically closed. To economize on length of the paper, and yet to introduce a method whereby T-Maps may be used to optimize the allocation of tolerances for line-profiles, the scope of the paper has been limited to square, rectangular, and triangular shapes. An example of tolerance accumulation is presented to illustrate this method.
Starting Page	041004
Ending Page	041010
Page Count	7
File Format	PDF
ISSN	15309827
e-ISSN	19447078
Journal	Journal of Computing and Information Science in Engineering
Volume Number	12
Issue Number	4
DOI	10.1115/1.4007404
Language	English
Publisher	The American Society of Mechanical Engineers
Publisher Date	2012-10-01
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Computer software Corners (Structural elements) Design Dimensions Geometry Manufacturing Modeling Shapes Space
Content Type	Text
Resource Type	Article
Subject	Computer Science Applications Computer Graphics and Computer-Aided Design Software Industrial and Manufacturing Engineering

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