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Evaluation and Comparison of a Large Machine Tool Structure with ISO Standard Alignment Tests

Myers, Alan, Barrans, Simon, Longstaff, Andrew P., Fletcher, Simon and Ford, Derek G. (2009) Evaluation and Comparison of a Large Machine Tool Structure with ISO Standard Alignment Tests. In: Laser Metrology and Machine Performance. Euspen Ltd, euspen headquarters, University of Cranfield, pp. 57-66. ISBN 978-0-9553082-7-7

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    In order to satisfactorily machine precision components it is necessary for
    machine tools to be able to achieve extremely high levels of geometric accuracy.
    This requires their structures to be extremely rigid such that deflections caused
    by self weight and traversing of the moving elements do not induce distortions
    that exceed the required tolerances of the components which are manufactured
    by the machines.
    To aid this aspect of machine tool technology, a range of standards have been
    systematically created which specify in great detail a variety of geometric tests
    which can be applied to the various configurations of machine tools currently in
    use today. Certain machine tool companies will use national or ISO standards,
    others will create their own, often based upon the ISO but tailored to suit their
    specific machine configuration and characteristics.
    However, achieving the required tolerances can be extremely difficult due to
    a number of reasons such as geometric errors, thermal distortions causing errors
    to change as temperatures change and load errors causing the errors to change
    due to the variation in load magnitude and the changes in positions of the loads.
    One major source of load errors on large machine is caused by the machine’s
    own weight and its re-distribution as the machine is traversed through its own
    working stroke, whereas another significant source is caused by the variety in
    component weights and their variation in position, either on static or moving
    table machines. In some cases the tolerances specified in standard tests can be
    tighter than grade “A” straightedge tolerances and achieving this accuracy under
    conditions which apply to large and heavy machine tool installations can cause
    significant problems and considerable unanticipated costs.
    A review is made here of how these difficulties might be overcome by use of
    modern technology and adopting the outlined planned approach to the design
    and build procedure used of large and heavy machine tools.

    Item Type: Book Chapter
    Subjects: T Technology > TJ Mechanical engineering and machinery
    Schools: School of Computing and Engineering
    School of Computing and Engineering > Centre for Precision Technologies
    School of Computing and Engineering > Centre for Precision Technologies > Engineering Control and Machine Performance Research Group
    School of Computing and Engineering > Pedagogical Research Group
    School of Computing and Engineering > Turbocharger Research Institute
    Related URLs:
    Depositing User: Helene Pickles
    Date Deposited: 17 Sep 2009 16:50
    Last Modified: 23 Sep 2014 12:20


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