기준

정의

검사 또는 가공에 사용하는 기준 요소.

프론트매터의 정의를 기준으로 삼고 셋업·가공·검사 전 과정에서 같은 의미로 사용합니다.

공식 / 규칙

• Lock the primary, secondary, and tertiary datum sequence before offsets or inspection decisions are accepted.
• If the datum changes, re-zero the setup and re-check any dependent dimensions.

대표 범위

• Use the same datum scheme from setup sheet to CMM report so result interpretation does not drift.
• If the drawing switches datums, treat it as a new verification condition.

현장 시나리오

• Re-establish the datum after reclamping a part before trusting previous offset values.
• Use the datum hierarchy to decide whether an out-of-position feature comes from setup or toolpath.

일반 오류 / 문제 해결

• If measurement results conflict between operators, verify that the same datum feature and probing sequence were used.
• If offsets are repeatedly corrected in the wrong direction, confirm that the setup zero still matches the intended datum.

관련 도구

• Gdt Reference
• True Position Calculator