Relevant bibliographies by topics / Tolerance stack up

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Tolerance stack up'

Author: Grafiati
Published: 11 August 2021
Last updated: 2 February 2022

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Journal articles on the topic "Tolerance stack up"

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Sahani, A. K., A. K. Sharma, and J. K. Bajpai. "Tolerance Stack up Analysis of a Mechanical Assembly." Materials Today: Proceedings 4, no. 2 (2017): 1459–68. http://dx.doi.org/10.1016/j.matpr.2017.01.168.

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Wan Din, W. I., T. T. Robinson, C. G. Armstrong, and R. Jackson. "Using CAD parameter sensitivities for stack-up tolerance allocation." International Journal on Interactive Design and Manufacturing (IJIDeM) 10, no. 2 (July 22, 2014): 139–51. http://dx.doi.org/10.1007/s12008-014-0235-2.

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Polini, Wilma, and Massimiliano Marziale. "To model bolted parts for tolerance analysis using variational model." International Journal of Engineering & Technology 4, no. 1 (January 14, 2015): 139. http://dx.doi.org/10.14419/ijet.v4i1.3962.

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Mechanical products are usually made by assembling many parts. Among the different type of links, bolts are widely used to join the components of an assembly. In a bolting a clearance exists among the bolt and the holes of the parts to join. This clearance has to be modeled in order to define the possible movements agreed to the joined parts. The model of the clearance takes part to the global model that builds the stack-up functions by accumulating the tolerances applied to the assembly components. Then, the stack-up functions are solved to evaluate the influence of the tolerances assigned to the assembly components on the functional requirements of the assembly product.The aim of this work is to model the joining between two parts by a planar contact surface and two bolts inside the model that builds and solves the stack-up functions of the tolerance analysis. It adopts the variational solid model. The proposed model uses the simplified hypothesis that each surface maintains its nominal shape, i.e. the effects of the form errors are neglected. The proposed model has been applied to a case study where the holes have dimensional and positional tolerances in order to demonstrate its effectiveness.
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Lee, Woo-Jong, and T. C. Woo. "Tolerances: Their Analysis and Synthesis." Journal of Engineering for Industry 112, no. 2 (May 1, 1990): 113–21. http://dx.doi.org/10.1115/1.2899553.

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Tolerance, representing a permissible variation of a dimension in an engineering drawing, is synthesized by considering assembly stack-up conditions based on manufacturing cost minimization. A random variable and its standard deviation are associated with a dimension and its tolerance. This probabilistic approach makes it possible to perform trade-off between performance and tolerance rather than the worst case analysis as it is commonly practiced. Tolerance (stack-up) analysis, as an inner loop in the overall algorithm for tolerance synthesis, is performed by approximating the volume under the multivariate probability density function constrained by nonlinear stack-up conditions with a convex polytope. This approximation makes use of the notion of reliability index [10] in structural safety. Consequently, the probabilistic optimization problem for tolerance synthesis is simplified into a deterministic nonlinear programming problem. An algorithm is then developed and is proven to converge to the global optimum through an investigation of the monotonic relations among tolerance, the reliability index, and cost. Examples from the implementation of the algorithm are given.
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Byun, Sungwoo. "Managing tolerance stack-up through process integration team in steel industry." Annals of Business Administrative Science 18, no. 6 (December 15, 2019): 223–36. http://dx.doi.org/10.7880/abas.0191002a.

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Sahani, A. K., Pramod Kumar Jain, and Satish C. Sharma. "Tolerance Stack up Analysis for Angularity of Components and their Assembly." Procedia Engineering 69 (2014): 952–61. http://dx.doi.org/10.1016/j.proeng.2014.03.075.

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Sahani, A. K., P. K. Jain, Satish C. Sharma, and J. K. Bajpai. "Design Verification through Tolerance Stack up Analysis of Mechanical Assembly and Least Cost Tolerance Allocation." Procedia Materials Science 6 (2014): 284–95. http://dx.doi.org/10.1016/j.mspro.2014.07.036.

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Desrochers, Alain. "A CAD/CAM Representation Model Applied to Tolerance Transfer Methods." Journal of Mechanical Design 125, no. 1 (March 1, 2003): 14–22. http://dx.doi.org/10.1115/1.1543974.

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This paper presents the adaptation of tolerance transfer techniques to a model called TTRS for Technologically and Topologically Related Surfaces. According to this model, any three-dimensional part can be represented as a succession of surface associations forming a tree. Additional tolerancing information can be associated to each surface association represented as a node on the tree. This information includes dimensional tolerances as well as tolerance chart values. Rules are then established to infer tolerance chains or stack up along with tolerance charts directly from the graph. This way it becomes possible to combine traditional one dimensional tolerance transfer techniques with a powerful three-dimensional representation model providing high technological contents.
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Panneer, R., and A. M. Jackson. "Comparative Analysis of Chosen Tolerance Stackup Methods and Development of an Improved Tolerance Analysis Method." Applied Mechanics and Materials 813-814 (November 2015): 954–58. http://dx.doi.org/10.4028/www.scientific.net/amm.813-814.954.

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The perception of Tolerance Analysis (TA)/Tolerance Stackup is imperative for every Design and Manufacturing Engineer because Tolerance is the criterion that should be compromised between the cost and function of a product. The literatures relevant to 15 methods of TA which are being used to determine Assembly Tolerance from Component Tolerances are collected and critically analyzed to gain an insight into the existing methods. Out of these methods, four major methods viz., Simulation Based Stack-Up Analysis, Second Order Tolerance Analysis, OpTol - Spatial Tolerance Analysis and Tolerance Analysis of 2D and 3D Assemblies are chosen for further study and comparative analysis. Based on the analysis and based on the identified merits and demerits of these methods, a framework for a new TA Method is developed. Based on the developed framework, a new TA Method using Artificial Neural Network (ANN) is developed and trained which can predict the value of Assembly Tolerance for the known Component Tolerances.
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Cheng, Kuo Ming, and Jhy Cherng Tsai. "Graph-Based Process Planning for Rotational Part Machined with Tolerancing." Applied Mechanics and Materials 52-54 (March 2011): 1824–29. http://dx.doi.org/10.4028/www.scientific.net/amm.52-54.1824.

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This paper investigates a methodology and corresponding graph modeling of process planning for cylindrical machined parts with tolerancing. Methods and techniques for representing possible process plans, reducing the complexity and eliminating over-toleranced plans are developed. The method first maps each feature of a part into feasible finishing processes that are capable to achieve the specified tolerances associated with the feature. All possible process plans are then developed by expanding preceding processes of each finishing process. The expanded processes form a graph, or a forest, with processes as nodes and process sequence as links. Processes with same specifications can be further merged and pruned to reduce the complexity of the graph. Tolerance stack-up of each possible plan for simplified results is also further computed by tolerance chart such that over-toleranced plans are eliminated. As there are often many feasible plans for machining a part, the qualified plan that satisfies design specifications is achieved by traversal through the graph imposing tolerance chart. An example is also demonstrated to illustrate the approach and the model. The merit of this method is to employ a unified graph model for representing and reasoning.
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Dissertations / Theses on the topic "Tolerance stack up"

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Yang, Yihong. "Integrated quality control planning in computer-aided manufacturing planning." Worcester, Mass. : Worcester Polytechnic Institute, 2007. http://www.wpi.edu/Pubs/ETD/Available/etd-041607-164054/.

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Thesis (Ph. D.)--Worcester Polytechnic Institute.
Keywords: In-process inspection; tolerance assignment; tolerance stack-up analysis; quality control planning. Includes bibliographical references (leaves 136-148).
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Strandh, Johan, and Viktor Ruda. "Radialmåttavvikelser i Transformatorlindningar : Ett examensarbete hos Hitachi ABB Power Grids Ludvika." Thesis, Uppsala universitet, Industriell teknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-450028.

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This assignment is based on the tolerance problems that occur with the radial dimensions or RR-dimensions for the windings. The purpose is to identify the various parameters that affect said RR-dimensions and where these parameters originate from to be able to assure quality of the winding process. The RR-dimension has a tolerance of + 2,2 and - 1,1 mm, but it is only the positive tolerance that cause problems. The case study is based on a mixture of quantitative and qualitative methods. Quantitative data collections of dimensions for leaders and how the RR-measurement are affected by them, analysis of tolerances and how well they are adapted for their purpose. Qualitative observations, experiments and semi-structured interviews have also been conducted to gain a deeper understanding of the problem. The results show that tolerance problems originate from several different factors. The first factor is the debatable tolerance setting on some conductors, mainly the thin CTC conductors that do not have a high radial dimension. These conductors have tolerances that do not fill a purpose because it does not ensure the quality for the winding. The conductors need a tighter tolerance spectrum for the positive direction to be fully functional. The air gap that can occur between the conductors is also a cause of error. This stems from the fact that it is not possible to achieve a sufficiently high force when tensioning the disc. This can also occur from the uneven surface of the CTC-conductor that can create gaps. Another cause of error that affects the dimension is the number of turns for a disc. When a disc is wound with a high number of turns it will lead tothat the influencing factors have a higher amount of turns to effect on. This means that a small increase of the conductor's nominal dimension or small air gaps has a large impact on the overall RR-dimension.
För att kvalitetssäkra transformator- och reaktorlindningarna hos företaget Hitachi ABB skade utsatta toleranserna för varje lindning uppfyllas för att kunna fortsätta vidare i produktionslinan. Arbetet är grundat utifrån de förekommande variationerna hos lindningarnas mått i radiell riktning (RR-mått. Arbetets syfte är att undersöka Hitachi ABB:s lindningsproduktion för att finna de faktorer som ger upphov till måttvariationer hos RRmåttet. De identifierade faktorerna ska användas för att kvalitetssäkra företagets lindningsprocess. Färdigställt arbete ska användas som grund för företagets fortsatta arbetekring kvalitetssäkring. RR-måttet har en tolerans på + 2,2 och – 1,1 mm, däremot är detendast de variationer i positivt led där problem uppstår. Vid ett för högt mått genomförs enutredning för att se över om lindningen kan brukas ändå eller utifall de för höga måttet i radiell riktning påverkar prestandan samt montering. Arbetet är en fallstudie utfört med en blandning av kvantitativa och kvalitativa metoder. Denkvantitativa datainsamlingens syfte är att undersöka ledares mått i lindningar för att se hur RR-måttet påverkas måttsättning och varvantal. Den kvantitativa datainsamlingen genomför också analyser av toleranser och hur väl anpassade de är för sitt syfte. Kvalitativa observationer, experiment och halvstrukturerade interjuver har genomförts för att skapa en djupare förståelse kring problemet.Resultatet visar att de variationer som uppstår hos RR-måttet påverkas av flera olika faktorer.Variationer hos RR-måttet uppstår främst för lindningar där en CTC-ledare används. En påverkande faktor är toleransvidden för ledarna, främst för de tunna CTC-ledarna. Ledarna lindas runt varandra där ledarens mått staplas på varandra för att bilda ett RR-mått. För de tunna CTC-ledarna bör en mindre toleransvidd användas, mer specifikt en lägre positiv tolerans likt de platta ledarna för att kunna kvalitetssäkra lindningen. En annan påverkandefaktor är de luftspalter som uppstår mellan ledarna. Luftspalter härstammar ifrån att det integår att uppnå tillräckligt hög kraft vid spänning av en skiva alternativt från CTC-ledarens knöliga yta. Utöver dessa två faktorer har antalet lindade varv för en skiva en påverkan förtoleransstapling. Fler varv resulterar i att små måttavvikelser för ledare påverkar det totala måttet, vilket innebär att de luftspalter som kan uppstå blir fler när antalet varv ökar.
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Kamali, Nejad Mojtaba. "Propositions de résolution numérique des problèmes d'analyse de tolérance en fabrication : approche 3D." Phd thesis, Grenoble 1, 2009. http://tel.archives-ouvertes.fr/tel-00445639.

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Ce travail contribue à développer des méthodes de résolution associées à la méthode de simulation MMP (Model of Manufactured Part) développée par F.Vignat et F.Villeneuve. Le MMP est un modèle générique 3D des défauts géométriques engendrés sur les pièces fabriquées par un processus de fabrication donné. Ce modèle permet de générer un ensemble de pièces virtuellement fabriquées incluant les incertitudes de fabrication et permet par conséquent de mener l'analyse de tolérances fonctionnelles. Les méthodes de résolution développées autour du MMP permettent aux ingénieurs de fabrication d'évaluer une gamme de fabrication candidate du point de vue géométrique. Le développement des méthodes de résolution s'est effectué selon 2 axes. Le premier axe consiste à développer des méthodes pour la recherche du pire des cas (WCTA). La première approche de cet axe utilise des méthodes d'optimisation (SQP pour Sequential Quadratic Programming et GA pour les algorithmes génétiques) basées sur la recherche du pire des cas. La recherche du pire des cas consiste en un algorithme d'optimisation multicouche comportant deux boucles principales. La deuxième approche de cet axe consiste à faire une adaptation de la méthode du torseur des petits déplacements avec intervalle (modèle Jacobien Torseur développé au Canada) à la méthode MMP. Le deuxième axe concerne les méthodes stochastiques permettant une simulation de production d'un ensemble de pièces et l'analyse des résultats d'un point de vue statistique. La méthode stochastique est basée sur une méthode de tirage aléatoire sous contraintes. Les différentes approches sont finalement comparées entre elles.
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"Tolerance Analysis of Parallel Assemblies using Tolerance-Maps® and a Functional Map Derived from Induced Deformations." Master's thesis, 2012. http://hdl.handle.net/2286/R.I.15887.

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abstract: This thesis concerns the role of geometric imperfections on assemblies in which the location of a target part is dependent on supports at two features. In some applications, such as a turbo-machine rotor that is supported by a series of parts at each bearing, it is the interference or clearance at a functional target feature, such as at the blades that must be controlled. The first part of this thesis relates the limits of location for the target part to geometric imperfections of other parts when stacked-up in parallel paths. In this section parts are considered to be rigid (non-deformable). By understanding how much of variation from the supporting parts contribute to variations of the target feature, a designer can better utilize the tolerance budget when assigning values to individual tolerances. In this work, the T-Map®, a spatial math model is used to model the tolerance accumulation in parallel assemblies. In other applications where parts are flexible, deformations are induced when parts in parallel are clamped together during assembly. Presuming that perfectly manufactured parts have been designed to fit perfectly together and produce zero deformations, the clamping-induced deformations result entirely from the imperfect geometry that is produced during manufacture. The magnitudes and types of these deformations are a function of part dimensions and material stiffnesses, and they are limited by design tolerances that control manufacturing variations. These manufacturing variations, if uncontrolled, may produce high enough stresses when the parts are assembled that premature failure can occur before the design life. The last part of the thesis relates the limits on the largest von Mises stress in one part to functional tolerance limits that must be set at the beginning of a tolerance analysis of parts in such an assembly.
Dissertation/Thesis
M.S. Mechanical Engineering 2012
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Books on the topic "Tolerance stack up"

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Tolerance stack-up analysis: [for plus and minus and geometric tolerancing]. 2nd ed. Hendersonville, TN: James D. Meadows & Associates, 2010.

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Tolerance Stack-Up Analysis. James D. Meadows & Associates, Inc., 2001.

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Mitchell Sommers, Susan. Manoah’s Songs of Experience. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190687328.003.0011.

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There is a strong temptation to hold up the lives of brothers Manoah and Ebenezer Sibly for comparison—they make plausible stock characters: the good brother and the bad one. The bare evidence of their lives readily suggests this simplistic reading. Manoah was described by his eulogist as “quiet, steady, tolerant, patient, and above all, trustworthy.” Manoah was a steady husband and devoted father, a responsible shorthand recorder employed by the Old Bailey, a long-time employee of the Bank of England, and for fifty years, a Swedenborgian minister. He seems the antithesis to the flighty, insincere, deceptive Ebenezer. But Manoah was not a simple character. In the 1780s, he and Ebenezer worked jointly on astrological projects, embroiling Manoah in legal and spiritual compromises that brought some very public criticism, endangering Manoah’s reputation within the New Church.
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Book chapters on the topic "Tolerance stack up"

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Bourdet, Pierre, François Thiébaut, and Grégory Cid. "Writing the 3D Chain of Dimensions (Tolerance Stack-Up) in Symbolic Expressions." In Geometric Tolerancing of Products, 123–49. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118587027.ch6.

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Meadows, James D. "Tolerance Stack-Up Analysis." In Geometric Dimensioning and Tolerancing: Applications, Analysis, Gauging and Measurement [per ASME Y14.5-2018], 442–65. ASME Press, 2020. http://dx.doi.org/10.1115/1.859999_ch23.

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Sahani, A. K., P. K. Jain, and C. Sharma Satish. "Geometrical Tolerance Stack Up Techniques." In DAAAM International Scientific Book 2013, 857–72. DAAAM International Vienna, 2013. http://dx.doi.org/10.2507/daaam.scibook.2013.52.

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Meadows, James D. "Tolerance Stack-Up Analysis in a 5-Part Assembly." In Geometric Dimensioning and Tolerancing: Applications, Analysis, Gauging and Measurement [per ASME Y14.5-2018], 481–501. ASME Press, 2020. http://dx.doi.org/10.1115/1.859999_ch25.

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Meadows, James D. "Tolerance Stack-Up Created during Manufacture of Products Due to Changing Set-Ups." In Geometric Dimensioning and Tolerancing: Applications, Analysis, Gauging and Measurement [per ASME Y14.5-2018], 502–6. ASME Press, 2020. http://dx.doi.org/10.1115/1.859999_ch26.

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Hoffmann, Michael P., Carrie Koplinka-Loehr, and Danielle L. Eiseman. "Farmers, Businesses, and Scientists." In Our Changing Menu, 165–81. Cornell University Press, 2021. http://dx.doi.org/10.7591/cornell/9781501754623.003.0010.

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This chapter explores key examples of the progress being made and work to be done in solving the challenges facing our menu. It begins with what farmers and ranchers are doing, such as climate-smart farming, conserving the soil, diversifying to reduce risks, and adopting new technologies. Those in the business of food are also changing to remain resilient and stay in business. And finally, scientists are developing hardier crops that tolerate the new stresses wrought by climate change. The chapter then considers what we can do. It is important to become informed, be climate-change literate, speak up about climate change and make it part of the regular dialogue, reduce food waste, switch to a more plant-based diet, and support those who stock the menu — fisher, farmer, and rancher.
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"decency, compassion. Neighbours resembles the down-home, wholesome populism of a Frank Capra comedy except that its suburban protagonists are saved the trouble of traveling to and from a big city to discover their true values. 8 Differences are resolved, dissolved, or repressed The characters are “almost compulsively articulate about problems and feelings” (Tyrer 1987). Crises are solved quickly, usually amicably. Conflict is thus managed almost psychotherapeutically by and within the inner circle of family, and the outer circle of Ramsay Street. Witness the episode broadcast on April 23, 1992 in Australia: after fire destroys much of Gaby’s clothes boutique, three female neighbors remake the lost stock, while three male neighbors clear up the debris from the shop. As the theme song has it: “Neighbours should be there for one another.” Incursions of conflict from the social world beyond these charmed circles are treated tokenistically or spirited away. The program blurs or represses differences of gender politics, sexual preference, age, and ethnicity. Domestic violence and homosexuality, male or female, are unknown. Age differences are subsumed within family love and tolerance. Aboriginal characters manage a two-episode plot line at most (Craven 1989: 18), and Greeks, despite the real Melbourne being the third largest Greek city in the world, figure rarely. Neighbours-watchers could likewise be forgiven for not knowing that Melbourne has the largest Jewish community in Australia. The program elides questions of disability, alcoholism, or religious difference. It displaces drug addiction on to a friend outside immediate family circles (Cousin 1992). Unemployment as a social issue is subordinated to the humanist characterization of Brad, for instance, as dopey, happy-go-lucky surfie. Neighbours counterposes suburban escapism to the high-gloss escapism of Santa Barbara. 9 Depoliticized middle-class citizenship These “cosy parish pump narratives,” as Ian Craven calls them, depoliticize the everyday (Craven 1989: 21). Such good middle-class suburban citizenship is roundly condemned by no less than Germaine Greer: The world of Neighbours is the world of the detergent commercial; everything from the kitchen worktops to the S-bend is squeaky clean. Everyone’s hair and underwear is freshly laundered. No one is shabby or eccentric; no one is poor or any colour but white. Neighbours is the Australian version of the American dream, owner-occupied, White-Anglo-Saxon-Protestant paradise. (Greer 1989) In this blithely comfortable middle-class ethos, the characters seem never to have problems with mortgage repayments. Commenting on the opening episodes of Neighbours, a British critic underlines its property-owning values:." In To Be Continued..., 111. Routledge, 2002. http://dx.doi.org/10.4324/9780203131855-13.

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Conference papers on the topic "Tolerance stack up"

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Dresner, Thomas L., and Philip Barkan. "Optimal Tolerance Allocation for Tolerance Stack-Ups." In ASME 1993 Design Technical Conferences. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/detc1993-0389.

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Abstract The allocation of individual tolerances that form critical stack-ups is an important task in mechanical design. It is desirable, but difficult in practice, to allocate tolerances to obtain all required stack-ups at minimum cost. A minimum-cost allocation method is proposed here that works for both a single tolerance stack-up and for multiple tolerance stack-ups that share one or more individual tolerances. Tolerances can be optimally allocated for both worst case and a variety of 6σ statistical cases. The method is applicable to one-dimensional stack-ups and to multi-dimensional stack-ups with known sensitivity functions. It is a numerical Lagrange multiplier method that is more general than the Lagrange multiplier methods that have often been proposed. The basic method will almost always provide the lowest cost result when the manufacturing process to produce each toleranced dimension has been firmly established in advance. An exact method for efficiently extending the basic method to determine the lowest cost process for producing each dimension is also introduced.
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Fu, Wentao, Saigopal Nelaturi, Arvind Rangarajan, and Tolga Kurtoglu. "Tolerance Analysis for Validating Manufacturing Process Plans." In ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-34329.

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In manufacturing process planning, it is critical to ensure that the part generated from a process plan complies with tolerances specified by designers to meet engineering constraints. Manufacturing errors are stochastic in nature and are introduced at almost every stage of executing a plan, for example due to inaccuracy of tooling, misalignment of location, distortion of clamping etc. Furthermore, these errors accumulate or ‘stack-up’ as the manufacturing process progresses to inevitably produce a part that varies from the designed model. The resultant variation should be within prescribed design tolerances. In this work, we present a novel approach for validating process plans using 3D tolerance stack-up analysis by representing variations of nominal features in terms of extents of their degrees of freedom within design and manufacturing tolerance zones. We will show how the manufacturing error stack-up can be effectively represented by composition and intersection of these transformations. We demonstrate several examples with different tolerance specifications to show the applicability of our approach for process planning.
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Cagan, Jonathan, and Thomas R. Kurfess. "Optimal Tolerance Allocation Over Multiple Manufacturing Alternatives." In ASME 1992 Design Technical Conferences. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/detc1992-0162.

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Abstract We introduce a methodology for concurrent design that considers the allocation of tolerances and manufacturing processes for minimum cost. Cost is approximated as a hyperbolic function over tolerance, and worst-case stack-up tolerance is assumed. Two simulated annealing techniques are introduced to solve the optimization problem. The first assumes independent, unordered, manufacturing processes and uses a Monte-Carlo simulation; the second assumes well known individual process cost functions which can be manipulated to create a single continuous function of cost versus tolerance with discontinuous derivatives solved with a continuous simulated annealing algorithm. An example utilizing a system of friction wheels over the manufacturing processes of turning, grinding, and saw cutting bar stock demonstrates excellent results.
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Shoukr, David Sh L., Mohamed H. Gadallah, and Sayed M. Metwalli. "The Reduced Tolerance Allocation Problem." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-65848.

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Tolerance allocation is a necessary and important step in product design and development. It involves the assignment of tolerances to different dimensions such that the manufacturing cost is minimum, while maintaining the tolerance stack-up conditions satisfied. Considering the design functional requirements, manufacturing processes, and dimensional and/or geometrical tolerances, the tolerance allocation problem requires intensive computational effort and time. An approach is proposed to reduce the size of the tolerance allocation problem using design of experiments (DOE). Instead of solving the optimization problem for all dimensional tolerances, it is solved for the significant dimensions only and the insignificant dimensional tolerances are set at lower control levels. A Genetic Algorithm is developed and employed to optimize the synthesis problem. A set of benchmark problems are used to test the proposed approach, and results are compared with some standard problems in literature.
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Desrochers, Alain. "A CAD/CAM Representation Model Applied to Tolerance Transfer Methods." In ASME 1998 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/detc98/dac-5636.

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Abstract This paper presents the adaptation of tolerance transfer techniques to a model called TTRS for Technologically and Topologically Related Surfaces. According to this model, any three-dimensional part can be represented as a succession of surface associations forming a tree. Additional tolerancing information can be associated to each TTRS represented as a node on the tree. This information includes dimensional tolerances as well as tolerance chart values. Rules are then established to simulate tolerance chains or stack up along with tolerance charts directly from the graph. This way it becomes possible to combine traditional one dimensional tolerance transfer techniques with a powerful three-dimensional representation model providing high technological contents.
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Tsai, Jhy-Cherng. "Geometric Tolerance Analysis for Mechanism Design." In ASME 1996 Design Engineering Technical Conferences and Computers in Engineering Conference. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-detc/dac-1053.

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Abstract Manufacturing tolerances and joint clearances are the two major factors affecting mechanism accuracy. As error analysis is one of the bottlenecks of precision machinery design, methods for geometric tolerance analysis must be investigated for mechanism design. This paper describes an approach for analyzing errors caused by geometric tolerances and clearances in mechanism design. The method consists of three parts: variational kinematic models for geometric tolerances, a systematic geometric dimensioning and tolerancing (GD&T) representation scheme, and computation methods for interval and statistical tolerances. Variational models are based on differential transformation to model kinematic errors caused by tolerances and clearances. The model is consistent with error models used in typical mechanical devices. The GD&T scheme, called the Tolerance Network (TN), employs graph theory for representing GD&T as well as fitting specifications of a design is described. Errors are propagated by traversal throughout the network and stack-up of these variational models along the dominate path in the TN. Error computation methods for both interval and statistical tolerance types are discussed. A method for computing central moments, rather than analytical distributions, of statistical tolerances is developed to reduce the computation complexity. A five-degree-of-freedom robot is used as an example at each step to illustrate this approach.
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Shah, Jami J., and Bing-Chun Zhang. "Attributed Graph Model for Geometric Tolerancing." In ASME 1992 Design Technical Conferences. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/detc1992-0158.

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Abstract The development of a face-based attributed graph structure for modeling geometric tolerances is described here. The structure, designated as the DTF graph, provides an integrated view of the dimensioning scheme, dimensions, tolerances, features, and datums. In the current version of the DTF model, all ANSI Y14.5M tolerance classes are supported, except profile tolerances. Edge related tolerances (straightness, circularity) are supported by derived face intersections. Other tolerances, and datum reference frames, are supported as face attributes or attributes of the DTF graph. The tolerance model is compatible with commonly used hybrid CSG-Brep solid modelers and has the property of uniqueness for any dimensioning scheme. Applications of the DTF Graph include: detection of over and under-constrained dimensions, automatic re-dimensioning if the designer changes the dimensioning scheme, and automatic discovery of dimension-tolerance stack-up loops.
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8

Sandooja, Amit. "Analysis of Gear Radial and Tilt Tolerance Stack up and Correlation with Gear Micro Geometry." In SAE 2013 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2013. http://dx.doi.org/10.4271/2013-01-1491.

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Mahan, Tobias, Brenna Doyle, Nicholas Meisel, and Jessica Menold. "Pulling at the Digital Thread: Exploring the Tolerance Stack Up in Scan to Print Processes." In ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/detc2018-85844.

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The rise of affordable rapid non-contact digitizers and rapid prototyping tools, such as 3D printers, is enabling the seamless integration of geometric reverse engineering into the early phases of engineering design. Scanning technology has been widely adopted in bio-reverse engineering and the use of high fidelity non-contact scanners, such as Computed Tomography devices, allows designers, doctors, and researchers to digitally model boney structures, design orthotic and prosthetic devices, and preemptively plan complex surgeries. While the combination of 3D scanning and printing processes holds much promise for the fields of reverse engineering, biodesign, and new product development, problems with repeatability, accuracy, and precision have limited the wider spread adoption of 3D scan to print processes. While some studies have explored the errors inherent in higher fidelity scan to print (S2P) processes, no studies have explored the errors in S2P processes that leverage affordable rapid non-contact digitizers. The purpose of this study was to explore at which phases of the S2P process errors are introduced into the digital model. A controlled study was conducted using data from 27 scans using a common off-the-shelf non-contact optical digitizer and a relatively simple workpiece. Data from the digital thread was collected between each phase of the S2P process and compared against a truth model; the geometric and dimensional integrity of the data was calculated through a comparison between the digital model and the original truth model. Results indicate significant differences between digital models at the various steps of the S2P process.
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Kuo, Chang-Hsin, and Jhy-Cherng Tsai. "A Statistical Tolerance Analysis Method for Feature in Non-Normal Distribution." In ASME 2010 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/detc2010-28658.

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The tolerance analysis of an assembly is an important issue for mechanical design. Among many tolerance analysis methods, the conventional statistical tolerance analysis method is the most popular one. However, the conventional statistical tolerance analysis method is based on the normal distribution. It fails to predict the resultant tolerance of an assembly with features in non-normal distributions. In this paper, the distributions of features are transferred into statistical moments first. Then, the tolerance stack-up can be handled based on these moments. Finally, the computed resultant moments can be mapped back to probability distribution to find the resultant tolerance specification of the assembly. Two examples are used to demonstrate the proposed method. Compared to the resultants by Monte Carlo simulation with 1,000,000 samples, the predicted resultant tolerance specifications by this method are only −0.868% and 0.799% differences. The predicted resultant tolerances of this method are fast and accurate.
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Reports on the topic "Tolerance stack up"

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Recchia, S., J. A. Cordes, M. R. Kahlessi, and M. Worthington. Improving Reliability by Reducing Tolerance Stack-Up Failures. Fort Belvoir, VA: Defense Technical Information Center, December 2005. http://dx.doi.org/10.21236/ada443508.

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