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      <title>Unbend/Rebend tips and techniques</title>
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      <div class="title_topic3" id="xps10_pagetitle">Unbend/Rebend tips and techniques</div>
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               <p class="para_td"><a class="links" href="javascript:void(0)" onclick="top.openFile('sheetmetaldes/unbend.html');return(false);">Unbend/Rebend</a></p>
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               <p class="para_td"><a class="links" href="javascript:void(0)" onclick="top.openFile('sheetmetaldes/unbend_dialog.html');return(false);">Options</a></p>
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               <p class="para_td"><a class="links" href="javascript:void(0)" onclick="top.openFile('sheetmetaldes/build_multi_parts.html');return(false);">Related Topics</a></p>
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      </table><br><div class="title_division">Editing creation state</div>
      <p class="para_division">Converting parent features of an unbend/rebend into non&ndash;self&ndash;forming features may lock other Sheet Metal Features and Forming/Flatteningfeatures (such as holes and slots) in a non&ndash;creation state. To edit these features, you can temporarily convert their parents back into self&ndash;forming features via the <b class="uiTerm">Make Self&ndash;Forming Feature</b> and <b class="uiTerm">Make Non&ndash;Self&ndash;Forming Feature</b> right&ndash;click option menus in the <b class="uiTerm">Model Navigator</b>. A better solution is to replace these features with regular Modeling features such as, holes &amp; slots).
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      <div class="title_division">Unbending profile flange and multibend bracket</div>
      <p class="para_division">When created as self&ndash;forming features, all bends of the profile flange and multibend bracket form and unform together.&nbsp;The <b class="uiTerm">Unbend/Rebend</b> operators can be used to unformed individual bend regions of <b class="uiTerm">Profile Flange</b> and <b class="uiTerm">Multibend Bracket</b> features.
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      <div class="title_division">Unbending multiple regions</div>
      <p class="para_division"><b class="uiTerm">Unbend/Rebend</b> operations cannot unform multiple regions at once without ripping the material.
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      <p class="para_division">For example, the model below can successfully be unformed with <b class="uiTerm">Unbend/Rebend</b> operators.
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      <p align="center"><img align="bottom" src="graphics/unbend4.gif"></p>
      <p class="para_division">However, the model illustrated below cannot be unformed with <b class="uiTerm">Unbend/Rebend</b> operators without the first ripping the material.
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      <p align="center"><img align="bottom" src="graphics/unbend5.gif"></p>
      <div class="title_division">Updating subdivided faces</div>
      <p class="para_division"><b class="uiTerm">Unbend/Rebend</b> automatically creates a <b class="uiTerm">Face Subdivision</b> feature to subdivide existing faces that cross the boundaries of the bend face. &nbsp;New faces that cross the boundaries of the bend face are not automatically subdivided and may lower the performance of the <b class="uiTerm">Unbend/Rebend</b> feature or cause the <b class="uiTerm">Unbend/Rebend</b> feature to produce an error. You can subdivide new faces by redefining the <b class="uiTerm">Unbend/Rebend</b> feature via the right&ndash;click menu option, <b class="uiTerm">Redefine Feature</b>, in the <b class="uiTerm">Model Navigator</b>.
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      <div class="title_division">General tips</div>
      <p class="para_division">The <b class="uiTerm">Rebend</b> feature, when applied to an earlier Unbend feature will reform it. This means that in previous NX releases the <b class="uiTerm">Unbend/Rebend</b> will not work on a general flange or a bridge.&nbsp;The faces of these two features are b&ndash;surfaces. <b class="uiTerm">Unbend/Rebend</b> will not work on a flange that has a <b class="uiTerm">Machinery</b> or <b class="uiTerm">Full Miter Corner</b> as a child feature.&nbsp;The <b class="uiTerm">Machinery</b> and <b class="uiTerm">Full Miter</b> corner both perform an <b class="uiTerm">Unite</b> which the <b class="uiTerm">Unbend/Rebend</b> cannot handle.
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      <p class="para_division">The thickness of the bend area that is being unformed must be uniform.</p>
      <p class="para_division">The option on the <b class="uiTerm">Sheet Metal Preferences</b> dialog box, <b class="uiTerm">Forming</b> method, controls the use of <b class="uiTerm">Self&ndash;Forming</b> features. &nbsp;If the option <b class="uiTerm">Use Forming Operations</b> is checked any flange, inset flange, and bend you create will not be listed in the <b class="uiTerm">Form/Unform</b> dialog box. &nbsp;The way to get these features to now form or unform is to create <b class="uiTerm">Unbend</b> and <b class="uiTerm">Rebend</b> features on their cylindrical faces. &nbsp;If the option <b class="uiTerm">Use Self&ndash;Forming Features</b> is selected any flange, inset flange, and bend you create will be listed in the <b class="uiTerm">Form/Unform</b> dialog box.
      </p>
      <p class="para_division">If you apply an <b class="uiTerm">Unbend</b> to a cylindrical face of a flange, inset flange and/or bend that was created when the <b class="uiTerm">Use Self&ndash;Forming Feature</b> was checked these features will be changed to non&ndash;self&ndash;forming features that need a forming operator to form. &nbsp;If you wish to change them back to <b class="uiTerm">Self&ndash;Forming Features</b> simply highlight the feature in the <b class="uiTerm">Model Navigator</b>, right&ndash;click and select the option <b class="uiTerm">Make Self&ndash;Forming feature</b>.
      </p>
      <p class="para_division">If you create a flange when the option <b class="uiTerm">Use Self&ndash;Forming Feature</b> is checked the flange will display in the <b class="uiTerm">Form/Unform</b> dialog box and will then <b class="uiTerm">Form/Unform</b> from this dialog box. If you then change the option to <b class="uiTerm">Use Forming Operation</b> and create a flange, this flange will not display in the <b class="uiTerm">Form/Unform</b> dialog box. You must use the <b class="uiTerm">Unbend/Rebend</b> feature to get this flange to unform and form.
      </p>
      <p class="para_division">When you apply the <b class="uiTerm">Unbend</b> to a cylindrical face of a self&ndash;forming feature, the feature is converted into a non&ndash;self&ndash;forming feature. The system will place the self&ndash;forming feature into a permanently unformed state. A warning will appear that the conversion may lock downstream sheet metal design children (holes, slots, cutouts, etc.) in a non&ndash;creation state. You cannot edit child features locked in a non&ndash;creation state.
      </p>
      <p class="para_division">The name for a created flange, inset flange, and bend when the <b class="uiTerm">Use Self&ndash;Forming Feature</b> or <b class="uiTerm">Use Forming Operation</b> is checked will be the same. &nbsp;The only way to tell the difference between the two features will be with the <b class="uiTerm">Model Navigator</b> (different button will appear), or with the <b class="uiTerm">Form/Unform</b> dialog box. &nbsp;The features that were created when the <b class="uiTerm">Use Self&ndash;Forming Feature</b> option was selected will display in the <b class="uiTerm">Form/Unform</b> dialog box and those that were created when the <b class="uiTerm">Use Forming Operation</b> option was selected will not display.
      </p>
      <p class="para_division">It will be possible to <b class="uiTerm">Copy</b> and <b class="uiTerm">Paste</b> an <b class="uiTerm">Unbend/Rebend</b>. &nbsp;However, since <b class="uiTerm">Unbend/Rebend</b> does not have tool bodies it will not be possible to Instance them.
      </p>
      <p class="para_division">When you create an <b class="uiTerm">Unbend</b> on a flange, inset flange or bend, the BAF of these features will be used. &nbsp;If the <b class="uiTerm">Unbend</b> is created on any other cylindrical face the BAF of the unbend will be used.
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