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      <title>4-Axis Normal to Drive</title>
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      <div class="title_topic2" id="xps10_pagetitle">4-Axis Normal to Drive</div>
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      <p class="para_topic">4-Axis Normal to Drive allows you to define a tool axis that uses a 4-Axis rotation angle. This rotation angle effectively rotates the part about an axis as it would on a machine tool with a single rotary table. The 4-Axis orientation causes the tool to move within planes normal to the defined rotation axis.</p>
      <p class="para_topic">The rotation angle causes the tool axis to lean forward in relation to an otherwise normal axis relative to the Drive 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>
      <p class="para_topic">Interactively, this option works in the same way as 4-Axis Normal to Part. The tool, however, remains normal to the Drive Surface rather than the Part Surface. Because this option requires a Drive Surface it is only available if the Surface Area Drive Method is used. </p>
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