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      <title>Dual 4-Axis on Drive</title>
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      <div class="title_topic2" id="xps10_pagetitle">Dual 4-Axis on Drive</div>
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      <p class="para_topic">Dual 4-Axis on Drive works in exactly the same way as Dual 4-Axis on Part. The only difference is that Dual 4-Axis on Drive references drive surface geometry rather than part surface geometry. Because this option requires a Drive Surface, it is only available if the Surface Area Drive Method is used.</p>
      <div class="title_division">Same as Drive Path</div>
      <p class="para_division">Same as Drive Path allows you to copy the Tool Axis from an existing operation. This option can only be used with the Tool Path Drive Method. The Tool Path Drive Method uses the Tool Path in an existing operation to define the Drive Points in the current operation. The Drive Points are projected on to the selected Part Surfaces. Same As Drive Path retains the same Tool Axis that was used in the original operation.</p>
      <p class="para_division">The following figure illustrates a Planar Mill Operation that uses a Profile Cut Type.</p>
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         <p align="center"><img align="bottom" src="graphics/planmill_profcut.gif"></p>
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      <div class="title_figure">Planar Mill, Profile Cut</div>
      <p class="para_division">In the Surface Contour operation created using Tool Path Drive Method, Same As Drive allows you to maintain the same Tool Axis that was used in the Planar Mill operation.</p>
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         <p align="center"><img align="bottom" src="graphics/sameasdrv.gif"></p>
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      <div class="title_figure">Same As Drive Path</div>
      <div class="title_division">User Function</div>
      <p class="para_division">User Function enables you to define a Tool Axis by temporarily exiting NX and executing an Internal User Function Program. This capability provides added system flexibility by allowing you to use a Tool Axis in the current operation that is created outside of NX.</p>
      <p class="para_division">For definitions and general procedures, please refer to the discussion of User Defined Operations.</p>
      <p class="para_division">For names of CAM environment variables, refer to the User Function (UFUNC) User Guide.</p>
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