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      <title>In-Process Workpiece</title>
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      <div class="title_topic4" id="xps10_pagetitle">In-Process Workpiece</div>
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      <p class="para_topic">The In-Process Workpiece (IPW) is a geometric shape that is produced by the Manufacturing application to represent the machined workpiece at each stage of machining.  According to the order of the operations in the <b class="uiTerm">Program Order View</b>, each operation tool path progressively reduces the IPW to mimic the material removed from the actual workpiece on the machine tool.  This provides exceptional benefits to the user and to the tool path processors.  For tool path generation, some of the operations can use the IPW shape from the previous operation as input, which reduces user interaction and improves tool path cutting efficiency.  For verification and simulation, the IPW is progressively modified by all tool paths throughout turning, milling, and drilling operations (with very few exceptions).
      </p>
      <p class="para_topic">Manufacturing creates different types of IPWs depending on the type of operation that you use:</p>
      <ul class="unmarkedList">
         <li>
            <p class="para_item"><b>Milling/Drilling&nbsp;&mdash;&nbsp;</b>use a non-rotating IPW. This type of IPW is a three dimensional representation of the state of material removal in an operation at the point machining is stopped.
            </p>
         </li>
         <li>
            <p class="para_item"><b>Turning&nbsp;&mdash;&nbsp;</b>uses a spinning (rotating) IPW. This is equivalent to a static IPW that is spun around the axis of rotation of the lathe spindle. 
            </p>
         </li>
         <li>
            <p class="para_item"><b>Mill-Turn&nbsp;&mdash;&nbsp;</b>when generating a mill-turn program, the software maintains the IPW for each milling and turning operation and the conversion between the non-rotating and rotating states of the IPW is done automatically by the software.
            </p>
            <p class="para_item">In the case where a turning operation follows a milling operation, the software spins the static IPW of the milling operation around the axis of rotation of the turning operation&rsquo;s spindle coordinate system. It then creates a 2D cross-sectional silhouette of the spinning IPW and uses that spinning silhouette as the blank input to the turning operation.</p>
            <p align="center"><img align="bottom" src="graphics/ipw_mill_turn01.gif"></p>
            <p class="para_item">In the figure above: </p>
            <table border="1" cellpadding="2" cellspacing="1" width="317" align="center">
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                     <td colspan="1" rowspan="1">
                        <p class="para_td">1</p>
                     </td>
                     <td colspan="1" rowspan="1">
                        <p class="para_td">The static IPW of the milling operation</p>
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                     <td colspan="1" rowspan="1">
                        <p class="para_td">2</p>
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                     <td colspan="1" rowspan="1">
                        <p class="para_td">The spinning 3D IPW</p>
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                  </tr>
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                     <td colspan="1" rowspan="1">
                        <p class="para_td">3</p>
                     </td>
                     <td colspan="1" rowspan="1">
                        <p class="para_td">The spinning 3D IPW and spinning silhouette (2D IPW)</p>
                     </td>
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               </tbody>
            </table><br><p class="para_item">In the case where a milling operation follows a turning operation, the software uses the dynamic IPW of the turning operation as the spun outline of a body of revolution. This represents the current state of the machined part in a spinning situation. The steps taken here depend on whether the turning operation is the first operation of the mill-turn program or not.</p>
            <ul>
               <li>
                  <p class="para_item"> If it is the first operation, the blank for the milling operation is the intersection of the dynamic IPW with the original blank geometry of the turning operation. </p>
               </li>
               <li>
                  <p class="para_item">If it is not the first operation, the blank for the milling operation is the intersection of the dynamic IPW with the static IPW of the milling operation that preceded the turning operation. </p>
                  <p align="center"><img align="bottom" src="graphics/ipw_mill_turn02.gif"></p>
                  <p class="para_item">In the figure above: </p>
                  <table border="1" cellpadding="2" cellspacing="1" width="333" align="center">
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                           <td colspan="1" rowspan="1">
                              <p class="para_td">1</p>
                           </td>
                           <td colspan="1" rowspan="1">
                              <p class="para_td">The original blank</p>
                           </td>
                        </tr>
                        <tr>
                           <td colspan="1" rowspan="1">
                              <p class="para_td">2</p>
                           </td>
                           <td colspan="1" rowspan="1">
                              <p class="para_td">The dynamic IPW of the turning operation</p>
                           </td>
                        </tr>
                        <tr>
                           <td colspan="1" rowspan="1">
                              <p class="para_td">3</p>
                           </td>
                           <td colspan="1" rowspan="1">
                              <p class="para_td">The intersection between the dynamic IPW and the original blank</p>
                           </td>
                        </tr>
                     </tbody>
                  </table><br></li>
            </ul>
         </li>
      </ul>
      <div class="title_division">Creating a 3D In-Process Workpiece</div>
      <p class="para_division">For milling operations:</p>
      <ol type="1" start="1">
         <li>
            <p class="para_item">Create or select blank geometry to define the initial workpiece in the Geometry Group of this operation.</p>
         </li>
         <li>
            <p class="para_item">In the <b class="uiTerm">Containment</b> section of the <b class="uiTerm">Cut Parameters</b> dialog, choose <b class="uiTerm">Use 3D</b> from the <b class="uiTerm">In-Process Workpiece</b> option list. 
            </p>
         </li>
         <li>
            <p class="para_item">Set the <b class="uiTerm">Min Material Thickness</b> option to an appropriate value. 
            </p>
         </li>
      </ol>
      <p class="para_division">Cavity milling operations can also use the <b class="uiTerm">Level-Based IPW</b> option.  
      </p>
      <p class="para_division">For turning operations:</p>
      <p class="para_division">This is an automatic process that you do not have to initiate. </p>
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               <div class="para_tip">
                  <p class="para_tip_body">To suppress material removal update,  for example in situations where multiple tools machine the same cut region several times, turn off the <b class="uiTerm">Update IPW</b> option. This is a customizable item in the operation dialog.
                  </p>
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         </tr>
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      <p class="para_division">See <a class="links" href="javascript:void(0)" onclick="top.openFile('mfggeneral/ont_mb3_options_workpiece.html');return(false);">Workpiece</a> for more information.
      </p>
      <p class="para_division">See <cite class="titleReference">Milling Help</cite> &rarr; Common Cutting Options &rarr; Containment Parameters &rarr; <a class="links" href="javascript:void(0)" onclick="top.popUpPage('mfgmilling/index.html?goto=mfgmilling/cav_cut_ipw.html&vars=-aux,-home','linkInter','menubar=yes,status=yes,resizable=yes,toolbar=yes,scrollbars=yes,location=no,directories=no');return(false);">In-Process Workpiece</a> for more information on using an IPW in milling.
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