<!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>I,J,K-Projection Vector</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_topic3" id="xps10_pagetitle">I,J,K-Projection Vector</div>
      <hr noshade="true">
      <p class="para_topic">I, J, K allows you to define a Fixed Projection Vector by keying in values defining a vector relative to the origin of the Work Coordinate System. I,J,K corresponds to XC, YC, ZC. The vector is displayed at the origin of the coordinate system. An I,J,K of (0,0,-1) is the default projection vector.</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/fixprojvec.gif"></p>
      </div>
      <div class="title_figure">Fixed Projection Vector using I,J,K Values 0,0,-1</div>
      <div class="title_division">Line End Points</div>
      <p class="para_division">Line End Points allows you to define a Fixed Projection Vector by defining two points, selecting an existing line, or defining a point and a vector. The vector is parallel to the line and the arrowhead points in the direction of the second selected end point, or the selected end of the line.</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/fixprojvec_existln.gif"></p>
      </div>
      <div class="title_figure">Fixed Projection Vector Defined by Selecting an Existing Line</div>
      <div class="title_division">2 Points</div>
      <p class="para_division">2 Points allows you to define a Fixed Projection Vector by using the point subfunction to specify two points. The first point you specify defines the tail of the vector. The second point you specify defines the arrowhead of the vector. In other words, the Projection Vector is the vector from the first point to the second.</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/fixprojvec_2pts.gif"></p>
      </div>
      <div class="title_figure">Fixed Projection Vector Defined by Two Points</div>
      <div class="title_division">Tangent to Curve</div>
      <p class="para_division">Tangent to Curve allows you to define a Fixed Projection vector tangent to a selected curve. You will specify a point on the curve, select an existing curve, and select one of two displayed tangent vectors.</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/fixprojvec_tangcrv.gif"></p>
      </div>
      <div class="title_figure">Fixed Projection Vector Defined Tangent to a Curve</div>
      <div class="title_division">Example of Tangent to Curve</div>
      <p class="para_division">Here is an example of how Tangent to Curve works:</p>
      <ul>
         <li>
            <p class="para_item">Choose Tangent to Curve as the Projection Vector.</p>
         </li>
         <li>
            <p class="para_item">Define a point (point a illustrated above) to position the vector origin using the Point Subfunction.</p>
         </li>
         <li>
            <p class="para_item">Select a curve to define the vector tangency (curve b illustrated above).</p>
         </li>
         <li>
            <p class="para_item">Select one of the two displayed tangent vectors (vector c illustrated above).</p>
         </li>
      </ul>
      <div class="title_division">Spherical Coordinates</div>
      <p class="para_division">Spherical Coordinates allows you to define a fixed vector by keying in two angular values; Phi and Theta. Phi is the angle measured from +ZC and rotated in the ZC-XC plane from ZC to XC. Theta is the rotation angle about the ZC axis from XC to YC.</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/fixtoolax_sphercoord.gif"></p>
      </div>
      <div class="title_figure">Fixed Tool Axis Defined by Spherical Coordinates</div>
      <div class="title_division">Tool Axis</div>
      <p class="para_division">Tool Axis allows you to define a Projection Vector relative to the existing Tool Axis. When using Tool Axis, the Projection Vector always points in the opposite direction of the Tool Axis Vector.</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/toolax_projvec.gif"></p>
      </div>
      <div class="title_figure">Tool Axis Project Vector</div>
      <p class="para_division">Notice in the above illustration the Projection Vector points down causing the tool to contact the Part Surface from the top. The Drive Points project from the boundary plane to the Part Surface.</p>
      <table border="0">
         <tr>
            <td valign="top" align="left"><img align="left" src="../graphics/note.gif" alt="Note" title="Note"></td>
            <td valign="bottom" align="left" width="100%">
               <div class="para_note">
                  <p class="para_note_body"> NOTE: You cannot project along the Tool Axis if the axis depends on the Part Surface normal at the Contact Point (Normal, Relative, and 4-Axis Tool Axis options.)</p>
               </div>
            </td>
         </tr>
      </table>
      <div class="title_division">Away From Point</div>
      <p class="para_division">Away From Point allows you to create a Projection Vector extending away from a specified focal point toward the Part Surface. This option useful in machining the inside spherical (or sphere-like) surfaces where the focal point is the center of the sphere. The Drive Points projects from the Drive Surface to the Part Surface along lines that diverge away from the focal point. The minimum distance from the focal point to the Part Surface must be greater than the radius of the tool. Refer to the Caution.</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/awyfr_ptprojvec.gif"></p>
      </div>
      <div class="title_figure">Away From Point Project Vector</div>
      <p class="para_division">In this example, the Drive Points project in the opposite direction of the Projection Vector to reach the Part Surface.</p>
      <div class="title_division">Example of Away From Point</div>
      <p class="para_division">Here is an example of how Away From Point works:</p>
      <ul>
         <li>
            <p class="para_item">Select Away From Point as the Projection Vector</p>
         </li>
         <li>
            <p class="para_item">Select point a illustrated above</p>
         </li>
      </ul>
      <div class="title_division">Towards Point</div>
      <p class="para_division">Towards Point allows you to create a Projection Vector extending from the Part Surface to a specified focal point. This option useful in machining the outside spherical (or sphere-like) surfaces where the focal point is the center of the sphere.</p>
      <p class="para_division">In the following figure, the sphere is both the Drive and Part Surface. The Drive Points therefore project a zero distance from the Drive to the Part Surface. The Projection Vector direction determines the tool side of the Part Surface causing the tool to position from the outside towards the focal point.</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/twdsptprojvec.gif"></p>
      </div>
      <div class="title_figure">Towards Point Project Vector</div>
   </body>
</html>