Fixture Design Fundamentals

1995 ◽  
pp. 11-48
Author(s):  
A. Y. C. Nee ◽  
K. Whybrew ◽  
A. Senthil kumar
Keyword(s):  
Fixture Design

An Axiomatic Design View on Part Orientation Schemes

2014 ◽  
Vol 216 ◽  
pp. 310-315
Author(s):  
Felicia Veronica Banciu ◽  
George Drăghici ◽  
Eugen Pămîntaş
Keyword(s):  
Axiomatic Design ◽  
Design Matrix ◽  
Fixture Design ◽  
Design Rules ◽  
Information Axiom ◽  
Part Orientation

the paper proposes an axiomatic design view of orientation schemes used in fixture design, in context of using the axiomatic design rules and guidance to fixture design. In this paper the axiomatic design, matrix and rules are applied to orientation schemes in order to see what kind of designs result (uncoupled, decoupled) and how can be applied the information axiom to choose among the orientation schemes that one (s) that are best suited for the declared purposes-minimum orientation errors.

Quadratic Sensitivity Analysis of Fixtures and Locating Schemes for Rigid Parts

2000 ◽  
Vol 123 (3) ◽  
pp. 462-472 ◽  
Author(s):  
Johan S. Carlson
Keyword(s):  
Sensitivity Analysis ◽  
Numerical Experiments ◽  
Geometric Constraints ◽  
Fixture Design ◽  
Practical Relevance ◽  
Sensitivity Equation ◽  
Relative Gain ◽  
Contact Points ◽  
Scheme Evaluation ◽  
Error Interaction

The main purpose of locating schemes are to position parts. The locating scheme utilizes tooling elements, referred to as locators, to introduce geometric constraints. A rigid part is uniquely positioned when it is brought into contact with the locators. By using kinematic analysis we derive a quadratic sensitivity equation that relates position error in locators with the resulting displacement of the part held by the locating scheme. The sensitivity equation which depends on the locator positions and the workpiece geometry around the contact points can be used for locating scheme evaluation, robust fixture design, tolerancing and diagnosis. The quadratic sensitivity equation derived in this paper is novel by adequate dealing with locator contact at nonprismatic surfaces, nonsmall errors, locator error interaction effects and locator errors in arbitrary directions. Theory for comparing the relative gain in precision by using the quadratic sensitivity equation instead of the linear is developed. The practical relevance of the quadratic sensitivity equation is tested through numerical experiments.

Fixture Reusability and Reconfigurability Analysis Using Similarity Index

2000 ◽  
Author(s):  
Arlene G. Smithson ◽  
Zhenyu Kong ◽  
Dariusz Ceglarek
Keyword(s):  
Manufacturing System ◽  
Formal Method ◽  
Similarity Index ◽  
New Product ◽  
Fixture Design ◽  
Production Lines ◽  
Product Lines ◽  
Future Production ◽  
Manufacturing System Design ◽  
And Performance

Abstract Currently there is a lack of a formal method to utilize previous fixture information into the design of future product and production lines. The utilization of knowledge gained in the design of prior fixtures and the capability assessment of existing reconfigurable fixtures on the design of new product lines allow manufacturing system design for time and cost reductions. This paper presents the evaluation of a fixture design similarity index developed to assess the relevance of current fixtures design information for multi-model production (reconfigurability) or for future production lines design (reusability). The index developed decomposes N-2-1 fixture information into X, Y, and Z data with applicable constrains and part deflection requirements in the X, Y, and Z directions. This allows the evaluation and comparison of physical and performance attributes of any given fixture. An example demonstrating the methodology implementation to single fixture case analysis and conclusions are provided as part of the presentation.

scholarly journals Fixture Design to Supplement Machining and Fuel Cell Education

2016 ◽  
Author(s):  
Yeong Ryu ◽  
Hazem Tawfik ◽  
Brandon Weisberg ◽  
Daniel Boss ◽  
Gonca Altuger-Genc
Keyword(s):  
Fuel Cell ◽  
Fixture Design

Fixture design using prolog: An expert system

1984 ◽  
Vol 1 (2) ◽  
pp. 167-172 ◽  
Author(s):  
A. Márkus ◽  
Z. Márkusz ◽  
J. Farkas ◽  
J. Filemon
Keyword(s):  
Expert System ◽  
Fixture Design

CAFixD: A Case-Based Reasoning Fixture Design Method. Framework and Indexing Mechanisms

2005 ◽  
Vol 6 (1) ◽  
pp. 40-48 ◽  
Author(s):  
Iain M. Boyle ◽  
Kevin Rong ◽  
David C. Brown
Keyword(s):  
Design Method ◽  
Critical Issue ◽  
Design Solution ◽  
Case Based Reasoning ◽  
Fixture Design ◽  
Functional Requirements ◽  
Rigorous Approach ◽  
Machining Operations ◽  
Case Based ◽  
Individual Requirement

Fixtures accurately locate and secure a part during machining operations. Various computer-aided fixture design (CAFD) methods have been developed to reduce design costs associated with fixturing. One approach uses a case-based reasoning (CBR) method where relevant design experience is retrieved from a design library and adapted to provide a new design solution. Indexing design cases is a critical issue in CBR, and CBR systems can suffer from an inability to distinguish between cases if indexing is inadequate. This paper presents CAFixD, a CAFD methodology that adopts a rigorous approach to defining indexing attributes based upon axiomatic design functional requirement decomposition. A design requirement is decomposed in terms of functional requirements, physical solutions are retrieved and adapted for each individual requirement, and the design is then reconstituted to form a complete fixture design. This paper presents the CAFixD framework and operation, and discusses in detail the indexing mechanisms used.

Experimental Validation of Active Fixture Design Methodology

2014 ◽  
Author(s):  
Thomas N. Papastathis ◽  
Otto Jan Bakker ◽  
Svetan M. Ratchev ◽  
Atanas A. Popov
Keyword(s):  
Design Methodology ◽  
Design Procedure ◽  
Fixture Design ◽  
Optimal Layout ◽  
Test Bed ◽  
Optimal Position ◽  
Surface Finishes ◽  
Milling Operations ◽  
Active Clamp ◽  
The Difference

A design methodology for active and fully-active fixtures has been established previously. In this work the results of a part of the validation for the design are presented, namely the differences between two different layouts and the difference between application of an passive and active clamp. The test-bed consist of a reconfigurable fixturing system with an active clamp holding a thin-walled plate. For three cases passive and actively controlled clamping forces were exerted during a series of milling operations. These are (1) passive clamping at a suboptimal and (2) at the optimal position and (3) clamping with an actively controlled clamping force at the optimal clamping location. The previously proposed design procedure has been qualitatively validated since its predictions regarding optimal layout and adaptive clamping forces hold true, when comparing the surface finishes, which improve from case to case.

Rigidity considerations in fixture design—contact rigidity at locating elements

1966 ◽  
Vol 6 (1) ◽  
pp. 31-43 ◽  
Author(s):  
G.S.A. Shawki ◽  
M.M. Abdel-Aal
Keyword(s):  
Fixture Design ◽  
Contact Rigidity

Computer-Aided Fixture Design

1995 ◽  
pp. 122-154 ◽  
Author(s):  
A. Y. C. Nee ◽  
K. Whybrew ◽  
A. Senthil kumar
Keyword(s):  
Fixture Design ◽  
Computer Aided
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