Orientation or Bolt-Hole Rotation-Error Reference
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Flange Orientation and Bolt-Hole Rotation Error
Understanding reference baselines, top dead centre (T.D.C.) rules, and two-holes-square conventions in automet® FAB.
Flange Orientation Conventions
Flange orientation or bolt-hole rotation error in automet® FAB is evaluated against strict reference baselines:
- Grid North reference: Applied when the flange centerline is within 10° of vertical.
- Top dead centre (T.D.C.) reference: Applied as the reference baseline for all other flange orientations.
- Zero reference alignment: Standardized to a two-holes-square configuration.
 Bolt-hole rotation reference baseline
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 Two-holes-square zero reference configuration
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