Section 61 of 105
59. Datums, Tolerances, Alignment and Fit
Stable section ID: S05-CON-014-SECTION-61 · 14 content blocks
System05 assets shall use declared datum systems to control manufacturing, measurement, positioning, assembly, inspection, and robotic interaction.
Datum architecture shall distinguish:
- Primary, secondary, and tertiary datums.
- Structural and nonstructural references.
- Manufacturing datums.
- Assembly datums.
- Inspection datums.
- Robot-readable datums.
- Temporary and final-state references.
Tolerance requirements shall be derived from function rather than arbitrary precision. They shall account for manufacturing variation, assembly variation, material movement, wear, temperature, moisture, measurement uncertainty, and accumulated stack-up.
Alignment features should support coarse positioning, fine positioning, temporary capture, and final engagement as distinct states where appropriate.
Physical fit shall not by itself demonstrate correct alignment, locking, structural engagement, sealing, utility continuity, or verified compatibility.
Tolerance compensation shall occur through controlled features. Unrecorded grinding, drilling, bending, forcing, packing, or field modification of critical Interfaces shall not be permitted.
Inspection criteria shall identify the datum, measurement method, instrument accuracy, permissible limits, and resulting acceptance decision.