HISTORY AND OBJECTIVES OF VOLUMETRIC PERFORMANCE TESTING OF MACHINE TOOLS IN ACCORDANCE WITH ANSI/ASME B5.54 LASER DIAGONALS AND TELESCOPING BALL BARS WILL BE PRESENTED. TEST EQUIPMENT, METHODS OF DATA ACQUISITION AND ANALYSIS WILL BE REVIEWED. CASE STUDIES WILL BE PRESENTED IN SUPPORT OF THE TECHNICAL APPLICATION OF THIS TYPE OF MACHINE TOOL PERFORMANCE EVALUATION.