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      <title>Core and Cavity</title>
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      <div class="title_topic3" id="xps10_pagetitle">Core and Cavity</div>
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      <p class="para_topic">The Core and Cavity function creates two trimming sheets: one for the core, and one for the cavity. When you click the Create Cavity or Create Core buttons, the system pre-highlights and preselects the parting surface, the core or cavity region, and any patched surfaces. When you exit this dialog box, the entire parting is completed. </p>
      <div class="title_division">Setting Tolerance</div>
      <p class="para_division">Tolerance controls sewing of trimming sheets.</p>
      <div class="title_division">Checking Geometry</div>
      <p class="para_division">Check Geometry checks body geometry for each sheet that is going to be sewn. If any sheet has invalid geometry, it's highlighted.</p>
      <div class="title_division">Checking Overlapping</div>
      <p class="para_division">Check Overlapping checks for and highlights overlapping sheets.</p>
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            <td valign="top" align="left"><img align="left" src="../graphics/note.gif" alt="Note" title="Note"></td>
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                  <p class="para_note_body">NOTE: If there are many sheets, checking is time-consuming.</p>
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      <div class="title_division">Creating a Cavity</div>
      <p class="para_division">When you click Create Cavity, external parting surfaces, patch up surfaces, and cavity regions are highlighted.</p>
      <p class="para_division">You can select other sheets or deselect highlighted sheets and sew them together. The trimming sheet is linked to the cavity part and trims the work piece automatically.</p>
      <div class="title_division">Success</div>
      <p class="para_division">If creation of the trimming sheet is successful, it is linked to the cavity part, and an expression in the shrinkage part, split_cavity_supp, is set to 1 in order to unsuppress the trim feature in the cavity part. After that, the display part is changed to the cavity part and the cavity is shown together with the View Parting Result dialog box.  Using the buttons on the View Parting Result dialog box, you can change the trim direction of the cavity if it's not correct.</p>
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         <p align="center"><img align="bottom" src="graphics/illustrations/parting34_1.gif"></p>
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      <div class="title_figure">Cavity Created</div>
      <p class="para_division">The same methods are used to create the core.</p>
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         <p align="center"><img align="bottom" src="graphics/illustrations/parting36_1.gif"></p>
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      <div class="title_figure">Core Created</div>
      <div class="title_division">Fail</div>
      <p class="para_division">In some cases, you may fail to create the trimming sheet. Here are some procedures to help find and solve the problem.</p>
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               <p class="para_th">Problem</p>
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               <p class="para_th">Solution</p>
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               <p class="para_td">There are internal highlighted boundaries after you sew the surfaces together.</p>
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                     <p class="para_item">Increase tolerance value in the Core and Cavity dialog box, then sew them again.</p>
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                  <li>
                     <p class="para_item">Check the highlighted area to see if it is patched.</p>
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                  <li>
                     <p class="para_item">Check if the region boundary is correct.</p>
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               <p class="para_td">Fail to trim seed sheet.</p>
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               <p class="para_td">Check work piece and all surfaces to see whether the trimming sheet or work piece is large enough.</p>
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               <p class="para_td">Cannot sew surfaces together.</p>
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               <p class="para_td">Try to find overlapping parting surfaces.</p>
               <p class="para_td">Some holes may be patched up twice.</p>
               <p class="para_td">Use the NX sew feature to sew them manually.</p>
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               <p class="para_td">Lost some patch-up surfaces.</p>
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               <p class="para_td">Try to turn on another layer to see if they are in invisible layers.</p>
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