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      <title>Unform/Form sheet metal features</title>
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      <div class="title_topic3" id="xps10_pagetitle">Unform/Form sheet metal features</div>
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               <p class="para_td"><a class="links" href="javascript:void(0)" onclick="top.openFile('sheetmetaldes/flpat_ov.html');return(false);">Flat Pattern Overview</a></p>
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               <p class="para_td"><a class="links" href="javascript:void(0)" onclick="top.openFile('sheetmetaldes/flpat_terms.html');return(false);">How To</a></p>
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               <p class="para_td">Options</p>
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      </table><br><p class="para_topic">These two options allow you to form and unform the sheet metal features on the current body. This is useful especially if your body contains a general flange. Unforming the general flange prior to generating the flat pattern will result in a more accurate flat pattern. This is because the general flange has built in intelligence that unforming can take advantage of, whereas the current flat pattern software cannot.</p>
      <p class="para_topic">The state of the body will save with the flat pattern. For example, if you unform the body prior to creating the flat pattern, then the body will be unformed when the flat pattern updates. You can also set the body in an intermediate forming state through the <b class="uiTerm">Part In Process</b> function, and this intermediate state will be remembered in the flat pattern.
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      <p class="para_topic">The state of the body remembered by flat pattern is ordinarily the state it is in when the flat pattern first creates. &nbsp;However, if you use the <b class="uiTerm">Unform Sheet Metal Features</b> option and then update the flat pattern (for example, choose <b class="uiTerm">Apply</b> or <b class="uiTerm">OK</b>), an attribute will be added to the flat pattern group which will cause all formable features to unform every time the flat pattern is updated.
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      <div class="title_division">Change body</div>
      <p class="para_division">The <b class="uiTerm">Manual Update</b> process works only with one body at a time. If you wish to update the flat pattern on a different body, or if you want to specify which body on which to form/unform sheet metal features, choose the <b class="uiTerm">Change Body</b> button and select another body in the part.
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      <div class="title_division">Bend allowance formula</div>
      <p class="para_division">This option lets you set the default <b class="uiTerm">Bend Allowance Formula</b> to use to flatten cylindrical or conical faces created with non&ndash;Sheet Metal features. For Sheet Metal features, the system will use the <b class="uiTerm">Bend Allowance Formula</b> embedded in each feature. If the <b class="uiTerm">Sheet Metal Preferences</b> are set to use a global bend allowance formula, this button will not display.
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                  <p class="para_warning_body"><b class="uiTerm">Flat Pattern BAF</b> is only applied to <b class="uiTerm">Cylindrical</b> and <b class="uiTerm">Conical</b> type faces. <b class="uiTerm">BAF</b> is not applied to any B&ndash;surface.
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      <div class="title_division">Traversal control algorithm</div>
      <p class="para_division"><b class="uiTerm">Traversal Control</b> refers to the methods of identifying the faces of the part to flatten.
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      <p class="para_division">Four options are available:</p>
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               <p class="para_td"><b class="uiTerm">Sheet Metal</b></p>
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               <p class="para_td">Select the Sheet Metal traversal algorithm for parts that reflect a formable manufacturing process, and typically exhibit a uniform thickness. The algorithm identifies pairs of faces separated by a uniform thickness.</p>
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               <p class="para_td"><b class="uiTerm">Generic</b></p>
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               <p class="para_td">When flat representations are required for parts where the concept of thickness does not apply, you can obtain better results with the <b class="uiTerm">Generic</b> algorithm.
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               <p class="para_td"><b class="uiTerm">Woven Materials</b></p>
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               <p class="para_td">Use this option when you want to flatten a part made of woven materials such as composites. With this option traversal will function as Sheet Metal and you can select and deselect faces as <b class="uiTerm">Area Preserving</b> faces. You may select additional curves and/or points to project to the flat pattern in <b class="uiTerm">Layout Options</b>.
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               <p class="para_td"><b class="uiTerm">None</b></p>
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               <p class="para_td">Select <b class="uiTerm">None</b> when you want to flatten only the start face or a subset of faces of the body. You may then select additional faces to flatten in <b class="uiTerm">Layout Options</b>. You must insure that the additional faces you select connect to the start face somehow. Setting the <b class="uiTerm">Traversal Control</b> to None will also prevent traversal of the part during <b class="uiTerm">Automatic Update</b>.
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      </table><br><div class="title_division">Location</div>
      <p class="para_division">The <b class="uiTerm">Location</b> options menu determines how the flat pattern positions in the part. You can generate the flat pattern relative to the starting face or at the <b class="uiTerm">Work Coordinate System</b>.
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            <p class="para_item"><b class="uiTerm">Start Position</b>: The flat pattern will be oriented such that it touches the starting face in a plane that is tangent to the starting point.
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            <p class="para_item"><b class="uiTerm">WCS</b>: The flat pattern will be oriented in the XY plane of the current <b class="uiTerm">Working Coordinate System</b>. The starting point on the starting face maps to the origin of the WCS.
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