Designers have to consider voice of customer, process capability, manufacturing standards & condition, manufacturing method, characteristics of products to decide tolerances. Especially, in case of position of hole and pin, designers have to consider process capability to decide tolerances. The traditional position tolerances used in a drawing are theoretical values which are allocated to position under the worst case assembling condition that both hole and pin are the maximum material condition(MMC). However, When the process capability is high, more exact product size can be produced under stable manufacturing condition. larger clearance of hole and pin can be allocated. In this point of view, manufacturer could increase the yield by allocating larger position tolerance than theoretical position tolerance of hole and pin considering process capability.

Abstract
 1. 서론
 2. 이론적 배경
  2.1 공차(Tolerance)
  2.2 위치도 공차(Position Tolerance)
  2.3 체결구 부품
 3. 연구내용 및 방법
  3.1 연구수행 방법
  3.2 시뮬레이션 분석 모델
  3.3 공차할당 방법의 연구
  3.4 몬테카를로 시뮬레이션
 4. 결과 및 분석
  4.1 공정능력에 따른 최적 위치공차 도출
 5. 결론
 6. 참고문헌

• 이상현 | Sang Hyun Lee
• 이태근 | Tae Gun Lee
• 장성호 | Sung Ho Chang