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      <title>Changing the defaults</title>
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      <div class="title_topic2" id="xps10_pagetitle">Changing the defaults</div>
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      <p class="para_topic">You can change the sheet metal defaults for both global and command-specific parameters.</p>
      <div class="title_division">General: global parameters</div>
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         <li>
            <p class="para_item"><b class="uiTerm">Value Entry</b> lets you choose from three methods for defining bends in your parts: a neutral factor, a bend table, or a bend formula (see details below).
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            <ul>
               <li>
                  <p class="para_item"><b class="uiTerm">Neutral Factor Value</b> (the default) refers to the neutral axis&mdash;the point in a bend where the tension of the outside of the bend and the compression of the inside become neutral. This neutral axis is used when figuring the bend allowance for flat patterns. It depends on the mechanical properties of the material being bent, and is represented by a percentage of the stock thickness, measured from the inside bend radius. The default value for this option is 0.33. You can supply a value between 0 and 1.
                  </p>
               </li>
               <li>
                  <p class="para_item"><b class="uiTerm">Bend Table</b> points to a table that specifies a neutral factor based on values from the bend region for angle, radius, and material thickness. You create this table in a specified format and place it in a default location.
                  </p>
               </li>
               <li>
                  <p class="para_item"><b class="uiTerm">Bend Allowance Formula</b> lets you supply values for the standard variables. The default formula is (Radius+(Thickness*0.44))*rad(Angle). 
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         <li>
            <p class="para_item"><b class="uiTerm">Material Selection</b> provides access to a material table (also provided by you) that uses the material you select to provide the parameters for your bends. If you choose this option, the choices for <b class="uiTerm">Value Entry</b> are not available.
            </p>
         </li>
         <li>
            <p class="para_item"><b class="uiTerm">Material Thickness</b>: The default thickness for sheet metal parts.
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         </li>
         <li>
            <p class="para_item"><b class="uiTerm">Bend Radius</b>: The default radius for all bends (based on the minimum limit below which cracking or splitting occurs). You may want to change this value, depending on the type of material you are working with.
            </p>
         </li>
         <li>
            <p class="para_item"><b class="uiTerm">Relief Depth and Width</b>: Bending with a tight radius or with hard materials often results in burrs and fractures on the outside of the bends. Relief notches at the edges on the bend line address this problem. The depth and width options let you apply bend relief to the source face from which the flange is constructed, by specifying how far in from the edge of the face (D) and how wide (W) the reliefs extend.<br><br><img align="bottom" src="graphics/depth_width.gif" border="0"></p>
            <p class="para_item">If you do not want bend relief, select <b class="uiTerm">None</b>.
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         </li>
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      <div class="title_division">Flat Pattern Treatments</div>
      <p class="para_division"><b class="uiTerm">Treatments</b> for inside and outside corners: Chamfered or rounded corner treatments can be used to break the sharp corners.
      </p>
      <ul>
         <li>
            <p class="para_item"><b class="uiTerm">Corner treatment options</b>: Inside and outside corners can be chamfered or arced. In the latter case, you can supply a radius.
            </p>
         </li>
         <li>
            <p class="para_item"><b class="uiTerm">Flat pattern simplify</b>: Flat patterns created from a cylindrical face or a cutout placed across bend lines create a B-spline curve. This option converts B-spline curves to simple lines and arcs. You can specify the minimum arc and deviational tolerance for the simplified curve.
            </p>
         </li>
         <li>
            <p class="para_item"><b class="uiTerm">Remove system-generated bend reliefs</b>: When you create a closed corner with no relief or when you have a bend section that is inset into the base planar region without a relief, the software creates a very small bend relief or rip in the 3-D model to separate the sides of the bend section from the inset area. This option specifies that you want to remove those small bend reliefs or rips when the flat pattern is created. The following graphics highlight these reliefs.
            </p>
            <p class="para_item"><img align="bottom" src="graphics/system_reliefs1.gif" border="0"> <img align="bottom" src="graphics/system_reliefs2.gif" border="0"></p>
         </li>
         <li>
            <p class="para_item"><b class="uiTerm">Maintain holes for deformed flanges</b>: Flattening contour flanges on curved edges stretches the flanges. Holes created across bend regions in these areas are by default deformed splines. If you want the holes to be circular, select this option.
            </p>
         </li>
      </ul>
      <div class="title_division">Flat Pattern Display</div>
      <p class="para_division">You can specify which entities you want displayed on your flat pattern, on which layer, and how you want those entities represented: color, line type, and line width. For example, in the following flat pattern, bend centerlines are shown in blue dashed lines, bend tangent lines in phantom red, interior features in orange-yellow, and the exterior in black.</p>
      <p class="para_division"><img align="bottom" src="graphics/flat_pattern_display.gif" border="0"></p>
      <p class="para_division">Default callouts for sheet metal features can be displayed on your flat pattern, and you can customize those labels as well.</p>
      <p class="para_division">You can establish defaults for command-specific parameters, such as <b class="uiTerm">Dimple</b>, <b class="uiTerm">Taper Angle</b>, or <b class="uiTerm">Bead Profile Type</b>.
      </p>
      <p class="para_division">To access the forms for changing these defaults, choose <b class="uiTerm">File&rarr;Utilities&rarr;Customer Defaults</b>. From the applications list, choose <b class="uiTerm">NX Sheet Metal</b>.
      </p>
      <p class="para_division">For more detailed instructions on changing customer defaults, see <a class="links" href="javascript:void(0)" onclick="top.popUpPage('nx_sheet_metal/../cust_defaults/index.html','linkURL','menubar=yes,status=yes,resizable=yes,toolbar=yes,scrollbars=yes,location=no,directories=no');return(false);">Getting Started&rarr;Customizing NX&rarr;Customer Defaults</a>.
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