7The International Organization for Standardization. ISO 230-2- 2006Test code for machine tools-Part 2:Determination of accu- racy and repeatability of positioning numerically controlled axes IS]. Geneva:International Standard Organization,2006.
8American National Standards Committee. ASME B 5.54-2005 Methods for performance evaluation of computer numerically controlled machining centers[ S]. New York:The American So- ciety of Mechanical Engineers,2005.