<!DOCTYPE html
  PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<!--
Copyright (c) 2006 UGS Corp.

All Rights Reserved.

This software and related documentation are proprietary to UGS Corp.
-->
<html>
   <head>
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
      <title>4-Axis Relative to Part</title>
      <script language="javaScript">
        abridged="false";
        displayConditions=new Array();
      </script>
      <link type="text/css" href="../css/main_styles.css" rel="stylesheet">
   </head>
   <body class="bodydocs" onload="top.pageLoader()" bgcolor="#FFFFFF">
      <div class="title_topic2" id="xps10_pagetitle">4-Axis Relative to Part</div>
      <hr noshade="true">
      <p class="para_topic">4-Axis Relative To Part works in much the same way as 4-Axis Normal To Part. In addition, however, you may define a Lead and a Tilt angle. Because this is a 4-Axis machining method, the Tilt angle is generally left at the default value of zero degrees.</p>
      <p class="para_topic">If a Rotation Angle is specified in conjunction with a Lead and/or Tilt angle, then the final tool axis is determined by the following steps:</p>
      <ol type="1" start="1">
         <li>
            <p class="para_item">The Lead Angle and/or Tilt Angle are applied according to the part surface normal and the direction of motion of the cutter.</p>
         </li>
         <li>
            <p class="para_item">Because the tool axis in Step 1 may not lie in a valid 4-axis tool movement plane, that tool axis is then projected on to the valid 4-axis plane.</p>
         </li>
         <li>
            <p class="para_item">The Rotation Angle is applied directly within the 4-axis plane.</p>
         </li>
      </ol>
      <p class="para_topic">Lead Angle defines the angle of the Tool Axis forward or backward along the Tool Path. A positive Lead Angle value leans the tool forward based on the direction of the Tool Path. A negative Lead Angle value leans the tool backward based on the direction of the tool path.</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/4axrelpart.gif"></p>
      </div>
      <div class="title_figure">4-Axis Relative to Part</div>
      <p class="para_topic">Tilt Angle defines the angle of the Tool Axis from side to side. A positive value tilts the tool to the right as you look in the direction of cut. A negative value tilts the tool to the left.</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/4axrelpart2.gif"></p>
      </div>
      <div class="title_figure">4-Axis Relative to Part</div>
      <div class="title_division">Example of 4-Axis Relative to Part</div>
      <p class="para_division">Here is an example of how 4-Axis Relative to Part works:</p>
      <ul>
         <li>
            <p class="para_item">Choose 4-Axis Relative to Part as the Tool Axis.</p>
         </li>
         <li>
            <p class="para_item">Choose 2 Points as the Rotation Axis.</p>
         </li>
         <li>
            <p class="para_item">Define two points (a &amp; b above</p>
         </li>
         <li>
            <p class="para_item">Key in the desired 4-Axis rotation angle, Lead, and Tilt angles.</p>
         </li>
         <li>
            <p class="para_item">Choose OK.</p>
         </li>
      </ul>
   </body>
</html>