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      <title>Aerospace Unform options</title>
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      <div class="title_topic2" id="xps10_pagetitle">Aerospace Unform options</div>
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               <p class="para_td"><a class="links" href="javascript:void(0)" onclick="top.openFile('aerospace_sheetmetal/aero_unform.html');return(false);">Overview</a></p>
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               <p class="para_td"><a class="links" href="javascript:void(0)" onclick="top.openFile('aerospace_sheetmetal/unform_howto.html');return(false);">How To</a></p>
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               <p class="para_td">Options</p>
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      </table><br><div class="title_division">Bend Allowance &ndash; Neutral Factor</div>
      <p class="para_division">The length of the unformed flange depends on the <b class="uiTerm">Neutral Factor</b> defined in sheet metal preferences. The <b class="uiTerm">Neutral Factor</b> is a number between 0 and 1. It defines the position of the neutral surface as a percentage of the material thickness relative to the inside bend. The neutral surface is a theoretical surface which does not stretch or compress when the material is bent. The length of the neutral surface is the length of the flange in the unformed state. The <b class="uiTerm">Neutral Factor</b> depends on the material properties. When the preference value is changed, all <b class="uiTerm">Unform</b> features will update to reflect the new neutral surface.
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                  <p class="para_td">Number 1 indicates the position of neutral surface for Neutral Factor &equiv; 0.</p>
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                  <p class="para_td">Number 2 indicates position of neutral surface for Neutral Factor &equiv; 1.</p>
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                  <p class="para_td">Number 3 indicates position of neutral surface for Neutral Factor &equiv; 0.33.</p>
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