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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    The international journal of advanced manufacturing technology 14 (1998), S. 343-349 
    ISSN: 1433-3015
    Keywords: Geometric dimensioning and tolerancing ; Graphical model ; Stack analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The tolerance chart is a graphical method for representing the manufacturing dimensions of a workpiece or assembly, at all stages of its manufacture. The chart provides an intermediate control system of checks and balances to ensure that processing dimensions and tolerances will meet those specified on the print. Tolerance charts are generally used in studying the dimensional problems on individual parts. However, they have proved tedious in their application to assemblies. This paper presents a simple and systematic approach to the process of tolerance stack analysis. The “Noded graph” model is constructed, representing the given and the unknown dimensions. Links are then established, using the model, which help to formulate the stack path of interest into a linear equation. The equation is used to complete the tolerance stack analysis module. This will be explained using a variety of geometric dimensioning and tolerancing examples. In addition, it is simple and hence easy to practise and very logical.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The international journal of advanced manufacturing technology 13 (1997), S. 300-310 
    ISSN: 1433-3015
    Keywords: Bowl feeder ; Part resting aspect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper seeks to verify that the existing hypotheses, which predict the natural resting aspects of small engineering parts on soft and hard surfaces, are able to predict the orientation of parts on the track of a vibratory bowl at different vibrating amplitude levels. Most of the existing hypotheses developed were verified using the “drop test” method in which parts were repeatedly dropped from a certain height onto a surface in order to analyse the natural resting behaviour of parts. This paper describes an attempt to conduct accurate experiments in the laboratory to examine the probabilities of the feed orientation of square and rectangular components of different aspect ratios by varying the vibration amplitude levels and surface textures of the vibratory bowl. The experimental results were compared with the predictions of the hypotheses postulated first by Ngoi, Lye and Chen [1], secondly by Boothroyd [2] and thirdly by Ngoi, Lim and Lee [3]. The experimental results were found to agree well with those predicted by the hypotheses. Moreover, it is also observed that the vibrating amplitude of the vibratory bowl does not significantly affect the orientation of the parts.
    Type of Medium: Electronic Resource
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