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      <title>Toward Drive</title>
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      <div class="title_topic3" id="xps10_pagetitle">Toward Drive </div>
      <hr noshade="true">
      <p class="para_topic">If you are using the Surface Area Drive Method use the Toward Drive projection vector to avoid milling unintended part geometry. Toward Drive works similarly to the Normal to Drive projection method, except:</p>
      <ul>
         <li>
            <p class="para_item">it's designed for Cavity milling</p>
         </li>
         <li>
            <p class="para_item">the drive surface is on the inside of the part</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">The drive surface can be the same as the part surface.</p>
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      <ul>
         <li>
            <p class="para_item">the projection begins a short distance away from the drive surface (Normal to Drive projects from infinitely far back.)</p>
            <div class="figure">
               <p align="center"><img align="bottom" src="graphics/toward.gif"></p>
            </div>
            <div class="title_figure">Toward Drive &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</div>
            <div class="figure">
               <p align="center"><img align="bottom" src="graphics/normal.gif"></p>
            </div>
            <div class="title_figure">Normal to Drive </div>
         </li>
         <li>
            <p class="para_item">the tool path is limited by the drive surface boundaries </p>
         </li>
      </ul>
      <p class="para_topic">A typical example (see the figure below), is milling the inside of a cavity.</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/toward_cavity.gif"></p>
      </div>
      <div class="title_figure">Use Toward Drive to mill the inside of a cavity.</div>
      <div class="title_division">Defining the Material Side</div>
      <p class="para_division">Since the projection vector is always in the opposite direction of the Material Side Normal vector, it is important to define the Material Side Normal correctly. If the Material Side Normal vector doesn't point toward the material to be removed, use the Flip Material button in the Surface Drive Method dialog box to correct the direction.</p>
      <p class="para_division">T = Tool, D = Drive Surface, P = Part, PV = Projection Vector, MS = Material Side normal vector</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/toward_drive-1.gif"></p>
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      <div class="title_figure">Recommended Material Side</div>
      <div class="title_division">Limitations</div>
      <p class="para_division">Limitations include the following examples:</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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               <div class="para_note">
                  <p class="para_note_body">The first two examples produce incorrect results because the wrong material side was selected.</p>
               </div>
            </td>
         </tr>
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      <ul>
         <li>
            <p class="para_item">The tool path won't generate correctly if the tool path motion is opposite to the drive path motion.</p>
            <div class="figure">
               <p align="center"><img align="bottom" src="graphics/toward_drive-2.gif"></p>
            </div>
            <div class="title_figure">Tool Path Motion Opposite to Drive Path</div>
            <p class="para_item"></p>
         </li>
      </ul>
      <ul>
         <li>
            <p class="para_item">If the drive tool interferes with the part, you'll get an erratic tool path.</p>
            <div class="figure">
               <p align="center"><img align="bottom" src="graphics/toward_drive-3.gif"></p>
            </div>
            <div class="title_figure">Drive Tool Interferes with Part</div>
            <p class="para_item"></p>
         </li>
      </ul>
      <ul>
         <li>
            <p class="para_item">The tool must fit everywhere inside the Drive Surface.</p>
            <div class="figure">
               <p align="center"><img align="bottom" src="graphics/toward_drive-4.gif"></p>
            </div>
            <div class="title_figure">Tool Doesn't Fit Inside Drive Surface</div>
            <p class="para_item"></p>
         </li>
      </ul>
      <ul>
         <li>
            <p class="para_item">A feature of the part can't come inside the Drive Surface. You can fix this by assigning a stock value (S).</p>
            <div class="figure">
               <p align="center"><img align="bottom" src="graphics/toward_drive-5.gif"></p>
            </div>
            <div class="title_figure">Part Feature Inside of Drive Surface</div>
            <p class="para_item"></p>
         </li>
      </ul>
      <div class="title_division">Using Toward Drive</div>
      <p class="para_division">If an operation is using the Surface Area Drive Method, and you want to use Toward Drive, navigate as follows: &nbsp;&nbsp;</p>
      <p class="para_division">Edit a Surface Contouring Operation &rarr; under Drive Method select Surface Area &rarr; under Projection Vector select Toward Drive.</p>
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