The current evaluation of machine tools' machining performance relies on instruments measurement but not actual/real machining method. However, using instruments measurement evaluation is not only costly but also due to the installation defect of instruments, resulted in performance examination errors. This paper proposed to use titled condition of 10-15 degrees on the base of part's clamp with VERICUT® software to perform simulation for achieving the purpose of examine tools' machining performance. Findings showed that under the tilted condition of 10-15 degree, turn-mill type of interruptions occurred and unable to proceed. Modification on the cone frustum and anti-cone frustum design was applied to overcome turn-mill interruptions issues. This simulation results showed achievement of turn-mill type tools' machining performance evaluation with anti-cone frustum design.