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      <title>Trim Wall Angles</title>
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      <div class="title_topic4" id="xps10_pagetitle">Trim Wall Angles</div>
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      <div class="title_division">Description</div>
      <p class="para_division">Check the angle between the trimming curve (wall) and the trimming direction.</p>
      <div class="title_division">Purpose</div>
      <p class="para_division">To ensure that the trimming operation is not at an angle that will cause trimming steels to fracture or dull prematurely.</p>
      <div class="title_division">Computational Method</div>
      <ol type="1" start="1">
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            <p class="para_item">Sample points are generated on the trimming curve boundary.</p>
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         <li>
            <p class="para_item">At each sample point a 3d tanget to this curve is computed.</p>
         </li>
         <li>
            <p class="para_item">To compute the wall angle, a measuring orientation (view) is constructed as shown in the below image.</p>
            <p class="para_item"><img align="bottom" src="graphics/dfm_trim_wall_angles_2d.gif" border="0"></p>
         </li>
         <li>
            <p class="para_item">The wall angle is then the true angle between the zero vector and the 3-D curve tangent. This measurement is performed for each sample point. Any angles larger than the site specified value are reported as a non-conformance.</p>
         </li>
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      <p class="para_division">The following diagram contains the output for trim wall angles from the DFM advisor. The minimal wall angle was set to zero to gererate this output.</p>
      <p class="para_division"><img align="bottom" src="graphics/dfm_trim_wall_angles_iso.gif" border="0"></p>
      <p class="para_division">The table below shows the maximum allowable wall angle for various metal thicknesses.</p>
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               <p class="para_th">Part Material Thickness</p>
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            <th bgcolor="#c0c0c0" colspan="2" rowspan="1" valign="top">
               <p class="para_th">Trim Wall Angles</p>
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               <p class="para_td">Thickness Ranges[0] to &lt; Thickness Ranges[1]</p>
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            <td bgcolor="#f4f4f4" colspan="1" rowspan="1">
               <p class="para_td">Maximum Angles[0]</p>
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            <td bgcolor="#f4f4f4" colspan="1" rowspan="3">
               <p class="para_td">Standard Maximum Angle</p>
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               <p class="para_td">Thickness Ranges[1] to &lt; Thickness Ranges[2]</p>
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            <td bgcolor="#f4f4f4" colspan="1" rowspan="1">
               <p class="para_td">Maximum Angles[1]</p>
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            <td bgcolor="#f4f4f4" colspan="1" rowspan="1">
               <p class="para_td">&gt; = Thickness Ranges[2]</p>
            </td>
            <td bgcolor="#f4f4f4" colspan="1" rowspan="1">
               <p class="para_td">Maximum Angles[2]</p>
            </td>
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      </table><br><div class="title_division">Cost penalty</div>
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               <p class="para_th">Deviation</p>
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               <p class="para_th">Complexity Result</p>
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            <th bgcolor="#c0c0c0" colspan="1" rowspan="1" valign="top">
               <p class="para_th">Added Cost</p>
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            <th bgcolor="#c0c0c0" colspan="1" rowspan="1" valign="top">
               <p class="para_th">Complexity Value</p>
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            <td bgcolor="#f4f4f4" colspan="1" rowspan="2" valign="top">
               <p class="para_td">Less Than Standard</p>
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               <ul>
                  <li>
                     <p class="para_item">...</p>
                  </li>
                  <li>
                     <p class="para_item">...</p>
                  </li>
                  <li>
                     <p class="para_item">...</p>
                  </li>
               </ul>
            </td>
            <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="top">
               <p class="para_td">$XXX</p>
            </td>
            <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="top">
               <p class="para_td">X</p>
            </td>
         </tr>
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            <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="top">
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                     <p class="para_item">...</p>
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                  <li>
                     <p class="para_item">...</p>
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            <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="top">
               <p class="para_td">$XXX</p>
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            <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="top">
               <p class="para_td">X</p>
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