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CNC machining center is the biggest breakthrough in manufacturing industry. In three axis machining center total 21 geometric errors exist. Different techniques are used to improve machining accuracy thereby different compensation techniques has developed with time. Direct and indirect measurement methods are used to measure errors in machining center. Aim of this study is to analyse13-step diagonal or 13-sequential method to measure the error values in machining center by using interferometer by taking measurements on 13 lines. Measurements on twelve lines are measured by 12line method but thirteenth line is measured by using step diagonal method along a body diagonal of machining center by moving one axis at a time. Experiment is done on machining center in three ways (1) without giving compensation (2) with lead screw compensation and (3) with 13-step diagonal method compensation. Two verification experiments are conducted (a) by using interferometer and (b) by manufacturing a designed part on machining center. Later manufactured part is measured on CMM before and after giving compensation. It is expected that the accuracy of machining center may improve error considerably. Errors along body diagonal are measured by using direct measurement which is more accurate and can give better results. Introduction CNC machining center is one of the significant invention of 20th century in manufacturing industry that brings ease to the manufacturers than ever before. Five-axis machining center have two additional rotary axis than three linear axis. Five axis machine tool is more versatile and easily machined complex parts with better accuracy. Machining a complex part on five-axis machining center reduces time by 90% than conventional machining center [1]. Five-axis machining center has better ability to machine complex geometric parts but it is not suitable for cutting heavy parts due to its poor stiffness which effects accuracy. Three-axis machine tool is suitable for heavy duty cutting but different type of errors alter its accuracy [2] such as geometric error [3,4], thermal errors [5,6], servo errors [7], and cutting forced induced errors [8,9]. uasi-static errors i.e. kinematic errors, stiffness errors, geometric and thermal errors together constitute 70% of total errors in a machining center [10]. Among all the main factor that cause inaccuracies in machining center are geometric errors [11]. In total, there are 21 position-dependent geometric errors (PDGEs) in machining center shown in Figure 1 a linear displacement in Y-axis leads to position error in Y-axis, two straightness errors between X-Y and Y-Z axis, three rotational errors in each axis : a pitch error, yaw error, roll error and squareness errors between every two axis X-Y,Y-Z and Z-X [12].

A Novel 13-step Diagonal/Sequential Measurement Method for Error Measurement and Compensation of Linear Axis Machining Center