Section 56 of 103
55. Datum, Alignment, Fit and Seating
Stable section ID: S05-CON-015-SECTION-56 · 8 content blocks
A Datum is an authoritative geometric reference used to establish or verify position, orientation, dimensions, movement, or manufacturing relationships.
Datums may be points, axes, planes, surfaces, holes, targets, coordinate frames, or stable structural features.
Alignment is the process or verified condition of bringing entities into their required positional and angular relationship. Alignment may include coarse guidance followed by fine positioning.
Fit is the dimensional and geometric relationship between mating features after accounting for nominal dimensions, tolerances, clearances, and allowances.
Seating is the verified condition in which a component has reached its intended terminal support or contact position.
These conditions are distinct. Geometric fit does not establish correct alignment, seating does not establish final locking, and visual proximity does not establish any of them.
Datum and alignment features intended for robotic use shall connect to stable Interface or structural geometry and should not depend solely on removable covers, finishes, or visually inconsistent surfaces.
Required seating shall be inspectable through direct observation, measurement, physical indication, telemetry, or another approved method.