General end-mill is considered and chosen by kinds and properties of material before machining, but in case of orthopedic surgery, cutting performance of orthopedic end-mill must be always best because bone condition is checked after operative preparation including skin incision. Generally hard metal end-mill is used for high cutting performance in industrial fields. To apply hard metal end-mill to robotic orthopedic surgery, prototypes with STS are manufactured and tested for determining proper number of flutes and helix angle, additionally proper overhang length of end-mill from sleeve end was determined by checking deflection under cutting load and critical speed using FEM program. As a result helix angle, blade number and overhang length are determined as 45∘, 3, 7cm respectively.

Abstract
 1. 서 론
 2. 엔드밀의 날 관련 기본 인자 결정
 3. 엔드밀 simulation
  3.1 시뮬레이션을 위한 기본 조건
  3.2 엔드밀의 시뮬레이션
 4. 결 론
 후 기
 References

• 안영명(서일대학 자동차과 교수) | Young-Myung Ahn
• 이창훈(큐랙소(주) 기술개발팀 팀장) | Chang-Hun Lee