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      <title>Using punched features</title>
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      <div class="title_topic3" id="xps10_pagetitle">Using punched features</div>
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      <p class="para_topic">Punched features such as <b class="uiTerm">Louver</b>, <b class="uiTerm">Dimple</b>, <b class="uiTerm">Drawn Cutout</b>, and <b class="uiTerm">Bead</b> have certain restrictions on the profiles they allow. The following guidelines should assist you in creating successful punched features in NX Sheet Metal.
      </p><a name="dimps_cutouts"></a><div class="title_division">Dimples and drawn cutouts</div>
      <p class="para_division">The profile you supply for dimples and drawn cutouts has certain restrictions with regard to the part thickness and fillets in the section sketch. When applying thickness to the model, the direction of thickening and the fillet radius you choose affect the software's ability to create the feature. Consider the example below where the radius in the corners is 2 units.</p>
      <p class="para_division"><img align="bottom" src="graphics/punched1.jpg" border="0"></p>
      <p class="para_division">If you specify a part thickness of 3 units and a thickness direction towards the outside of the section, the result would be as shown in the following graphic.</p>
      <p class="para_division"><img align="bottom" src="graphics/punched2.jpg" border="0"></p>
      <p class="para_division">However, if you specify a part thickness of 3 units and a thickness direction towards the inside of the section, the result would be as shown in the following graphic. </p>
      <p class="para_division"><img align="bottom" src="graphics/punched3.jpg" border="0"></p>
      <p class="para_division">Notice how in the interior corners the model has degenerated and four blend faces from the first example are now missing. To create the feature properly, the software must have both an interior and exterior face for those corner regions. The situation illustrated above would be an error condition, and the software would be unable to create a <b class="uiTerm">Dimple</b> or <b class="uiTerm">Drawn Cutout</b> in this situation.
      </p><a name="louver_rules"></a><div class="title_division">Louvers</div>
      <p class="para_division">The <b class="uiTerm">Louver</b> feature has a similar restriction on the profile. Once again, this restriction is due to the disappearance of a face in the model.
      </p>
      <p class="para_division">Suppose we have a dimple profile that is 50 units long and 15 units wide, as shown below.</p>
      <p class="para_division"><img align="bottom" src="graphics/punched4.jpg" border="0"></p>
      <p class="para_division">If we increase the <b class="uiTerm">Width</b> of the <b class="uiTerm">Louver</b> to 20 units, the face between the two radii on the sides becomes smaller. If we increase the radius to 24 units, it becomes even smaller still.
      </p>
      <p class="para_division"><img align="bottom" src="graphics/punched5.jpg" border="0"><img align="bottom" src="graphics/punched6.jpg" border="0"></p>
      <p class="para_division">Finally, when the <b class="uiTerm">Width</b> becomes one-half the length of the section sketch, the face disappears and we get a degenerate model. This is an error condition, and the<b class="uiTerm"> Louver</b> feature won't build.
      </p>
      <p class="para_division"><img align="bottom" src="graphics/punched7.jpg" border="0"></p>
      <p class="para_division">So, when creating a <b class="uiTerm">Louver</b>, make sure that the <b class="uiTerm">Width</b> is less than one-half of the section sketch line.
      </p>
      <p class="para_division">Similarly, the <b class="uiTerm">Depth</b> of the <b class="uiTerm">Louver</b> must be less than the <b class="uiTerm">Width</b> value minus the <b class="uiTerm">Part Thickness</b> value. If this condition isn't met, the spherical sides of the <b class="uiTerm">Louver</b> can't maintain their spherical nature and the feature won't build.
      </p><a name="bead_rules"></a><div class="title_division">Beads</div>
      <p class="para_division">As with the other punched features, the values given to the <b class="uiTerm">Bead</b> feature can sometimes cause degenerate geometry. Each of the different bead types is shown below along with a discussion of the items to look for when choosing values for the various options.
      </p>
      <p class="para_division"><b class="uiTerm">V-Shaped Bead</b></p>
      <p class="para_division">The <b class="uiTerm">V-Shaped Bead</b> feature has restrictions on the radius of the <b class="uiTerm">Bead</b> in relation to the part thickness. The radius value must be greater than the part thickness. As shown in the examples below, when the radius equals the part thickness, a face on the inner side of the top of the bead disappears.
      </p>
      <p class="para_division"><img align="bottom" src="graphics/punched8.jpg" border="0">&nbsp;&nbsp;<img align="bottom" src="graphics/punched9.jpg" border="0"></p>
      <p class="para_division"><b class="uiTerm">Circular Bead</b></p>
      <p class="para_division">The <b class="uiTerm">Circular Bead</b> feature has restrictions on the height in relation to the radius. To maintain a circular section, the height of the feature must not exceed the radius. Otherwise, new faces would have to be added, and the feature would then become a <b class="uiTerm">U-Shaped Bead</b> instead of a <b class="uiTerm">Circular Bead</b>. 
      </p>
      <p class="para_division"><img align="bottom" src="graphics/punched10.jpg" border="0"><img align="bottom" src="graphics/punched11.jpg" border="0"></p>
      <p class="para_division"><b class="uiTerm">U-Shaped Bead</b></p>
      <p class="para_division">The <b class="uiTerm">U-Shaped Bead</b> feature has restrictions on the rounding you can apply to it. It's possible to supply values that prevent the rounding from being applied. It's a little harder to create this error condition than the previous examples, but certain combinations of <b class="uiTerm">Side Angle</b>, <b class="uiTerm">Width</b>, <b class="uiTerm">Part Thickness</b>, and <b class="uiTerm">Depth</b> may result in a condition where the rounding fails. This condition is fairly rare, however, and a simple adjustment of any of these values should correct the problem. 
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