Tolerance analysis is a major link between design and
manufacturing. An assembly or a part should be designed
based on its functions, manufacturing processes, desired
product quality, and manufacturing cost. Assembly tolerance
analysis performed at the design stage can reduce potential
manufacturing and assembly problems. Several commonly used
assembly tolerance analysis models and their limitations are
reviewed in this research. Also, a new assembly tolerance
analysis model is developed to improve the limitations of the
existing assembly tolerance analysis models. The new model
elucidates the impact of the flatness symbol (one of the
Geometric Dimensioning and Tolerancing (GD&T) specification
symbols) and reduces design variables into simple
mathematical equations. The new model is based on beta
distribution of part dimensions. In addition, a group of
manufacturing variables, including quality factor, process
tolerance, and mean shift, is integrated in the new assembly
tolerance analysis model.
A computer integrated system has been developed to
handle four support systems for the performance of tolerance
analysis in a single computer application. These support
systems are: 1) the CAD drawing system, 2) the Geometric
Dimensioning and Tolerancing (GD&T) specification system, 3)
the assembly tolerance analysis model, and 4) the tolerance
database operating under the Windows environment. Dynamic
Data Exchange (DDE) is applied to exchange the data between
two different window applications, resulting in improvement
of information transfer between the support systems. In this
way, the user is able to use this integrated system to select
a GD&T specification, determine a critical assembly dimension
and tolerance, and access the tolerance database during the
design stage simultaneously. Examples are presented to
illustrate the application of the integrated tolerance
analysis system. / Graduation date: 1995
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/35573 |
| Date | 25 August 1994 |
| Creators | Tangkoonsombati, Choowong |
| Contributors | Burhanuddin, Sheikh |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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