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      <title>4-Axis Normal to Part</title>
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      <div class="title_topic2" id="xps10_pagetitle">4-Axis Normal to Part</div>
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      <p class="para_topic">4-Axis Normal To Part allows you to define a tool axis that uses a 4-Axis Rotation Angle. The 4-Axis orientation causes the tool to rotate about the defined rotation axis while always remaining normal to the rotation axis.</p>
      <p class="para_topic">The rotation angle causes the Tool Axis to lean forward or back in relation to an otherwise normal axis relative to the Part Surface. Unlike a Lead angle, a 4-Axis rotation angle always leans to the same side of the normal axis. It is independent of the direction of the tool movement.</p>
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         <p align="center"><img align="bottom" src="graphics/4axnormpt.gif"></p>
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      <div class="title_figure">4-Axis, Norm to Part</div>
      <p class="para_topic">Notice in the left view illustrated above, that the rotation angle causes the tool axis to lean to the right of the Part Surface normal axis in both the Zig and Zag moves. The tool moves within parallel planes normal to the defined rotation axis.</p>
      <div class="title_division">Example of 4-Axis Normal to Part</div>
      <p class="para_division">Here is an example of how 4-Axis Normal to Part works:</p>
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            <p class="para_item">Select 4-Axis Normal to Part as the Tool Axis.</p>
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         <li>
            <p class="para_item">Select Two Points from the Vector Subfunction dialog.</p>
         </li>
         <li>
            <p class="para_item">Define two points (a &amp; b above) for the rotation axis using the Point Subfunction.</p>
         </li>
         <li>
            <p class="para_item">Key in the 4-Axis Rotation Angle.</p>
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