An industrial implementation of computer-aided tolerance charting

Britton, G. A.; Whybrew, K.; Tor, Shu Beng

doi:10.1007/bf01178952

Cited by 18 publications

(6 citation statements)

References 6 publications

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“…Tang and Davies [10] developed a computer-aided dimensional planning system, which was written in FORTRAN on a VAX 11/750 under the VMS operating system. Britton et al [11] developed a computer-aided tolerance charting system with a proprietary language. Konakalla and Gavankar [12] developed an object-oriented database system for tolerance charting in a Visual Cþþ environment.…”

Section: Introductionmentioning

confidence: 99%

CCATA - A Computer-Aided Angular Tolerance Charting System

Xue

2006

Proceedings of the Institution of Mechanical Engineers, Part B:

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This paper introduces a computer-aided angular tolerance charting (CAATC) system, which can deal with products with both angular features and square-shouldered features. The information needed to construct an angular tolerance chart electronically is described and the data structures used in the system are explained. The principle of angular tolerance charting is concisely depicted through analysing the overall structure of the system. The major functional modules of the system are also presented. Finally, an example is adopted to illustrate how to use the CAATC system.

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Section: Introductionmentioning

confidence: 99%

CCATA - A Computer-Aided Angular Tolerance Charting System

Xue

2006

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…Acyclic (rooted) tree representations of process plans are generated by uniquely identifying each machined surface. The technique has been applied to the process planning of prismatic parts [27,28] and has also been incorporated in an interactive, industrial software program, CATCH, for the process planning of rotational parts [29,30]. For details about tolerance charting and other graph theoretic methods for manufacturing refer to Whybrew and Britton [31] and Britton and Whybrew [30].…”

Section: Introduction and Definitionsmentioning

confidence: 99%

A graph theoretic approach linking design dimensioning and process planning

Thimm

Britton

Fok

2004

Int J Adv Manuf Technol

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The purpose of this paper and its companion (Part 2) is to present a rigorous graph theoretic model to link designing with process planning. This paper shows how to generate process plans from design dimension trees. It is the foundation for the companion paper, Part 2, which shows how part dimensioning (during designing) can be guided by knowledge of the datum-hierarchy tree structure underlying process plans. Design dimensions are represented as a design dimension tree, which is the basis for defining an ideal (optimal) datum-hierarchy tree of a process plan. The ideal datum-hierarchy tree, in turn, is used to define measures of process planning efficiency. These measures can be utilised to compare actual process plans and improve manufacturing processes. An example is presented to illustrate the concepts and method.

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“…Unfortunately, their technique is ineYcient because it generates cyclic graphs. Britton and Whybrew et al [10,11] developed a graph theoretical technique (rooted tree technique) that overcomes this limitation. The technique generates acyclic graphs (rooted trees, now referred to as datum hierarchy trees).…”

Section: Introductionmentioning

confidence: 99%

“…The technique generates acyclic graphs (rooted trees, now referred to as datum hierarchy trees). The technique has been proven in industrial practice through a software program called CATCH [8,11]. It improves on traditional tolerance charts by automatically calculating tolerance stack-ups, but the scheduling of operations still remains entirely in the hands of the process planner.…”

Section: Introductionmentioning

confidence: 99%

Optimal process plans for manufacturing and tolerance charting

Thimm

Britton

Whybrew

et al. 2001

Proceedings of the Institution of Mechanical Engineers, Part B:

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A graph theoretical approach is presented that permits the calculation of optimal process plans from datum hierarchy trees, which are elegant representations of tolerance charts. The theory is developed for a cost function that minimizes machine and datum changes. Restrictions on the sequence of machining operations arising from technical constraints or the layout of a group cell are taken into account. The process plans are optimal with respect to a specified datum hierarchy tree, manufacturing constraints and cost function. It is shown that the number of possible plans for real industrial trees is very large, and therefore this kind of optimization is beyond the ability of a human process planner. Trial runs with industrial parts indicate that optimization can be performed by a computer within a time period that is acceptable for industrial use.

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An industrial implementation of computer-aided tolerance charting

Cited by 18 publications

References 6 publications

CCATA - A Computer-Aided Angular Tolerance Charting System

CCATA - A Computer-Aided Angular Tolerance Charting System

A graph theoretic approach linking design dimensioning and process planning

Optimal process plans for manufacturing and tolerance charting

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