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      <title>Tool Axis-Swarf Drive</title>
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      <div class="title_topic2" id="xps10_pagetitle">Tool Axis-Swarf Drive</div>
      <hr noshade="true">
      <p class="para_topic">Swarf Drive enables you to define a tool axis that follows the swarf rulings of Drive Surfaces. This tool axis allows the side of the tool to cut the Drive Surfaces and the tip of the tool to cut the Part Surfaces. If the tool is non-tapered, then the tool axis is parallel to the swarf rulings. If the tool is tapered, then the tool axis is at an angle to the swarf rulings, but is co-planar with the rulings. The Drive Surfaces guide the side of the tool while the Part Surfaces guide the end of the tool. </p>
      <ol type="1" start="1">
         <li>
            <p class="para_item">You must select Multiple Drive Surfaces in order and must be edge-to-edge.</p>
            <div class="figure">
               <p align="center"><img align="bottom" src="graphics/surfcont_figures160.gif"></p>
            </div>
            <div class="title_figure">Swarf Rulings of Drive Surfaces</div>
         </li>
         <li>
            <p class="para_item">After you select Swarf Drive, the Swarf Drive dialog appears and four directional arrows appear relative to the first Drive Surface you selected. </p>
         </li>
         <li>
            <p class="para_item">You may select the Ruling Type, which is described in the following paragraph, or leave the default Ruling Type selected. </p>
         </li>
         <li>
            <p class="para_item">From the four vectors select the one that points toward the tool holder.</p>
         </li>
      </ol>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/surfcont_figures161.gif"></p>
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      <div class="title_figure">Swarf Drive</div>
      <p class="para_topic">In the above illustration, the Swarf Drive tool axis is used with a non-tapered tool and the Tool Axis projection vector. If a tapered tool is used, then the Swarf Ruling Projection Vector should be used to avoid gouging the Drive Surfaces.</p>
      <div class="title_division">Ruling Type</div>
      <p class="para_division">There are two options for the Ruling Type: Grid or Trim, or Base UV. &nbsp;</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/conical_trim_surf.gif"></p>
      </div>
      <div class="title_figure">Conical Surface that is trimmed</div>
      <div class="title_division">Grid or Trim Ruling</div>
      <p class="para_division">Grid or Trim is the ruling that results when the drive is made up of a Grid of surfaces or of a Trimmed surface, it will try to naturally align the ruling with the over all Grid boundary or the Trim boundary as illustrated below. &nbsp;</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/grid_trim.gif"></p>
      </div>
      <div class="title_figure">Grid or Trim Ruling</div>
      <div class="title_division">Base UV Ruling</div>
      <p class="para_division">The Base UV Ruling is the natural underlying ruling of a surface before it is trimmed or put into a Grid and it might not align with the Grid or Trim boundaries, as illustrated below.</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/uv_ruling.gif"></p>
      </div>
      <div class="title_figure">Base UV Ruling</div>
      <p class="para_division">Swarf Drive is only available if the Surface Area Drive Method is used. The Cut Type (Zig-Zag, Zig, Follow Pocket, etc.) has no effect on this option. To produce a single pass, however, the number of Stepovers must be set to zero. If the number of Stepovers is greater than zero, the system will produce multiple passes.</p>
      <table border="0">
         <tr>
            <td valign="top" align="left"><img align="left" src="../graphics/warning.gif" alt="Warning" title="Warning"></td>
            <td valign="bottom" align="left" width="100%">
               <div class="para_warning">
                  <p class="para_warning_body">CAUTION: A triangular Drive Surface may cause the tool to tilt as illustrated below. This behavior occurs because a rectangular grid of drive points cannot be created at the tip of the Drive Surface.</p>
                  <p class="para_warning_body"></p>
               </div>
            </td>
         </tr>
      </table>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/surfcont_figures162.gif"></p>
      </div>
      <div class="title_figure">Tilting Due to Triangular Drive Surface</div>
      <table border="0">
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            <td valign="top" align="left"><img align="left" src="../graphics/warning.gif" alt="Warning" title="Warning"></td>
            <td valign="bottom" align="left" width="100%">
               <div class="para_warning">
                  <p class="para_warning_body">  CAUTION: Corners or fillets smaller than the tool radius may prevent the tool from swarfing along the entire Drive Surface. In the following illustration, notice that the end of the tool contacts the next Drive Surface (surface B) before the tool has completed the swarf movement along surface A. This may cause a sudden jump in the tool axis as the tool positions tangent to surface B. In cases like this, it is best to use a 5-Axis Fan Sequential Mill operation.</p>
               </div>
            </td>
         </tr>
      </table>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/surfcont_figures163.gif"></p>
      </div>
      <div class="title_figure">Uncut Material Due to Corner</div>
      <div class="title_division">Example of Swarf Drive</div>
      <p class="para_division">Here is an example of how Swarf Drive works:</p>
      <ul>
         <li>
            <p class="para_item">Choose Surface Area as the Drive Method.</p>
         </li>
         <li>
            <p class="para_item">Select the eight drive surfaces illustrated below in sequence and continue defining the Drive Method as you normally would. Be sure to specify Zero stepovers.</p>
         </li>
      </ul>
      <p align="center"><img align="bottom" src="graphics/surfcont_figures163a.gif"></p>
      <p class="para_division">Once you have finished defining the Drive Method:</p>
      <ul>
         <li>
            <p class="para_item">Choose Swarf Drive as the Tool Axis. Four directional vectors are displayed as illustrated above.</p>
         </li>
         <li>
            <p class="para_item">Select the vector that points toward the tool holder (a).</p>
         </li>
      </ul>
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            <td valign="top" align="left"><img align="left" src="../graphics/note.gif" alt="Note" title="Note"></td>
            <td valign="bottom" align="left" width="100%">
               <div class="para_note">
                  <p class="para_note_body"> NOTE: If you respecify the Drive Geometry, you should always respecify the Swarf Drive directional vector as well. The correct orientation of the directional vectors must be established from the current Drive Geometry.</p>
               </div>
            </td>
         </tr>
      </table>
      <ul>
         <li>
            <p class="para_item">For this example, choose Tool Axis as the Projection Vector so that the Drive Points project along the tool axis which follows the swarf rulings of the Drive Surfaces.</p>
         </li>
      </ul>
      <div class="title_division">Swarf Tilt Angle</div>
      <p class="para_division">Swarf Tilt Angle is often used in a final pass to finish the intersection between the floor and wall. The Swarf Tilt Angle (A) is added to the Swarf angle to tilt the cutter slightly inward. &nbsp;The angle is calculated by passing a plane normal to the swarf ruling.</p>
      <p class="para_division">The default swarfing angle is 0 degrees from the drive surface. The Swarf Tilt Angle (A) is calculated by passing a plane normal to the swarf ruling. The angle is then added to the Swarf ruling to tilt the cutter slightly inward. &nbsp;The angle The tool axis normally follows the swarf rulings of the Drive Surfaces.</p>
      <p class="para_division"> <img align="bottom" src="graphics/surfcont_swarf_tilt.gif" border="0">   
      </p>
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