Orientation or Bolt-Hole Rotation-Error Reference: Difference between revisions

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Created page with "Flange orientation or bolt-hole rotation error is defined as follows: The reference is grid north when the flange centre-line is within 10° of the vertical and top dead centre (T.D.C.) for every other orientation. Zero reference is two holes square. See below: <gallery mode ="packed" heights= 300 px> File:KB 321.png File:KB 322.png </gallery>"
 
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Flange orientation or bolt-hole rotation error is defined as follows:  
__NOTOC__
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<div style="font-size:170%; font-weight:bold; margin-bottom:4px;">Flange Orientation and Bolt-Hole Rotation Error</div>
<div style="margin-bottom:8px;">Understanding reference baselines, top dead centre (T.D.C.) rules, and two-holes-square conventions in automet® FAB.</div>
<div style="font-size:90%;">[[Main Page|← Main Page]] &nbsp;·&nbsp; [[Automet® FAB - General Survey Concept|← Data Analysis]]</div>
</div>


The reference is grid north when the flange centre-line is within 10° of the vertical and top dead centre (T.D.C.) for every other orientation.
== Flange Orientation Conventions ==


Zero reference is two holes square. See below:
Flange orientation or bolt-hole rotation error in automet® FAB is evaluated against strict reference baselines:


<gallery mode ="packed" heights= 300 px>
* '''Grid North reference:''' Applied when the flange centerline is within 10° of vertical.
File:KB 321.png
* '''Top dead centre (T.D.C.) reference:''' Applied as the reference baseline for all other flange orientations.
File:KB 322.png
* '''Zero reference alignment:''' Standardized to a '''two-holes-square''' configuration.
</gallery>
 
<table style="width:100%; border-collapse:separate; border-spacing:16px; margin:16px 0;">
  <tr>
    <td style="width:50%; vertical-align:top; background:#ffffff; border:1px solid rgba(128,128,128,0.25); border-radius:6px; padding:14px; text-align:center;">
      [[File:KB 321.png|center|450px]]
      <div style="margin-top:10px; font-weight:bold; font-size:95%; color:#333;">Bolt-hole rotation reference baseline</div>
    </td>
    <td style="width:50%; vertical-align:top; background:#ffffff; border:1px solid rgba(128,128,128,0.25); border-radius:6px; padding:14px; text-align:center;">
      [[File:KB 322.png|center|450px]]
      <div style="margin-top:10px; font-weight:bold; font-size:95%; color:#333;">Two-holes-square zero reference configuration</div>
    </td>
  </tr>
</table>

Revision as of 08:06, 13 October 2026

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
Two-holes-square zero reference configuration
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