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Electronic based accuracy enhancement of CNC machine tools

Postlethwaite, Scott R. (1992) Electronic based accuracy enhancement of CNC machine tools. Doctoral thesis, Huddersfield Polytechnic.

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    The need for better machine tool accuracy is discussed
    together with the factors which can affect machine tool
    accuracy. A study is made of the various techniques adopted
    for the reduction of errors in machine tools. The concept
    of error compensation is discussed and the different
    techniques for error compensation are appraised. A critical
    appraisal is presented of the work undertaken to date in
    the field of error compensation. Based on this appraisal a
    criterion is established for a universally applicable error
    compensation system. The development of a novel, patented
    microprocessor based machine tool error compensation system
    which fulfills this criterion is described. This
    compensation system, which is based on the precalibrated
    compensation technique, utilizes a unique geometric
    compensation algorithm. This algorithm allows the
    compensation system to compensate for the geometric error
    components of any machine tool configuration up to three
    axes. The development of this geometric algorithm is
    presented. The integration of this compensation system to a
    large moving column milling machine is described.
    Measurement tests and cutting tests were performed on this
    milling machine to establish the effectiveness of the
    compensation system. The results from these experimental
    tests are presented, and illustrate the significant
    improvement in machine tool accuracy achieved through error

    This is the first attempt at producing a machine tool
    error compensation system with universal applicability,
    both in terms of the machine geometric model, and the
    method of applying the compensation to the machine tool.
    The error compensation system developed gives the potential
    for compensating for thermally induced and load induced
    position errors, and will enable further work in this area
    to be commercially exploited.

    Item Type: Thesis (Doctoral)
    Thesis advisorMorton, D.
    Thesis advisorFord, Derek
    Additional Information: EThOS Persistent ID
    Uncontrolled Keywords: Error compensation, Machinery Tools, Mathematics, Machinery
    Subjects: T Technology > TJ Mechanical engineering and machinery
    T Technology > TA Engineering (General). Civil engineering (General)
    Schools: School of Computing and Engineering
    Depositing User: Graham Stone
    Date Deposited: 10 Jun 2009 16:56
    Last Modified: 28 Jul 2010 19:37


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