1. 3) Cone Frustum Cutting, National Aerospace Standard, NAS 979 (1969).
2. 4) W. Knapp : Testing Rotary Axes on NC Machine Tools, Ann. CIRP, 39, 1 (1990) 549.
3. 5) Methods for Performance Evaluation of Computer Numerically Controlled Machining Centers, ANSI/ASME B5.54 (1991).