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2. National Aerospace Standards, 1969, NAS 979, Uniform Cutting Tests, NAS 900 Series metal cutting equipment specifications.
3. ASME B5. 54-1992 Methods for performance evaluation of computer numerically controlled machining centers;American Society of Mechanical Engineers,1993
4. The laser ball bar: a new instrument for machine tool metrology;Ziegert;Precision Eng,1994