<!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>Face Milling</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">Face Milling</div>
      <hr noshade="true">
      <div class="title_division">Part Geometry </div>
      <p class="para_division">Part Geometry <img align="bottom" src="graphics/partgeometry.gif" border="0"> allows you to specify bodies that represent the finished Part. Solid part geometry must be specified (or inherited) in order to use gouge checking.
      </p>
      <div class="title_division">Face Geometry</div>
      <p class="para_division">Face Geometry  <img align="bottom" src="graphics/facegeometry.gif" border="0"> consists of closed boundaries whose inside material indicate the areas to be machined. A face boundary can be created by selecting any of the following:
      </p>
      <ul>
         <li>
            <p class="para_item">A planar face, or flat B-surface </p>
         </li>
         <li>
            <p class="para_item">Face curves and edges</p>
         </li>
         <li>
            <p class="para_item">Points (which connect to form a polygon). </p>
         </li>
      </ul>
      <p class="para_division">When a face boundary is created from a face, the body associated to the selected face boundary, by default, is automatically used as Part geometry which is used to determine the cut regions at each level. If you want to use gouge checking, part geometry must be selected as Part in the geometry parent group or the operation. &nbsp;A face boundary created from curves/edges or points does not have this association. All members of a face boundary have tanto tool positions. At least one face boundary must be selected to generate a tool path. The normal of a face boundary plane must be parallel with the tool axis.</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"> To cut the faces in the order that you selected them, set Region Sequencing to Standard.</p>
               </div>
            </td>
         </tr>
      </table>
      <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">  If you want to inherit the faces for several operations, specify them in a Mill Boundary group as Blank Boundaries.</p>
               </div>
            </td>
         </tr>
      </table>
      <p class="para_division">Face Milling has been designed primarily for facing off planar faces. &nbsp;However, Face Milling may still be used for pocketing within certain limitations. &nbsp;For more information, see  <a class="links" href="javascript:void(0)" onclick="top.openFile('mfgmilling/fm_behav_floor_edge.html');return(false);">Behavior at Floor Edges</a>.
      </p>
      <div class="title_division">Cut Area </div>
      <p class="para_division">Cut Area is an alternate method to Face Geometry to define the faces to be cut. &nbsp;You cannot use both; you must choose to use either Cut Area, or Face Geometry. &nbsp;With Cut Area, you can select many faces. &nbsp;Only the flat faces are used. &nbsp;Use it when face geometry (blank boundaries) is not sufficient to define the machined faces on a Part body. &nbsp;Also, use this when you want to use wall geometry, such as when you are machining faces that have finished walls requiring a unique stock other than Part Stock. &nbsp;With this functionality you can use flat Cut Area faces to define the machined faces for a Face Milling operation. </p>
      <div class="title_division">Using Cut Area </div>
      <p class="para_division">To use Cut Area &nbsp; <img align="bottom" src="graphics/geomtype_cutarea.gif" border="0"> &nbsp;you must not select or inherit Face Geometry (Blank Boundaries) into the Face Milling operation. Only flat Cut Area faces normal to the tool axis are processed. 
      </p>
      <p class="para_division">Define Cut Area inside a Face Milling operation or inherited from a MILL_AREA geometry group. </p>
      <div class="title_division">Wall Geometry</div>
      <p class="para_division">Use Wall Stock and  <a class="links" href="javascript:void(0)" onclick="top.openFile('mfgmilling/face_wall_geom.html');return(false);">Wall Geometry</a> &nbsp; <img align="bottom" src="graphics/geomtype_walls.gif" border="0"> &nbsp;to override the global Part Stock for walls related to the machined faces on a Part Body. &nbsp;
      </p>
      <div class="title_division">Check Geometry or Check Boundaries</div>
      <p class="para_division">Check Geometry &nbsp; <img align="bottom" src="graphics/checkbody.gif" border="0"> or Check Boundaries &nbsp; <img align="bottom" src="graphics/checkgeometry.gif" border="0"> allows you to specify either bodies or closed boundaries that represent clamps. If closed boundaries are used, all members of a check boundary have tanto tool positions. Similar to Check boundaries in a Planar Milling operation, the material side is defined with respect to the direction of the boundary. It indicates where the material is and it can be either inside or outside (measured along the tool axis, starting from the plane of a boundary). The normal of a check boundary plane must be parallel with the tool axis.
      </p>
      <p class="para_division">Refer to the Introduction of Planar and Cavity Milling for a discussion of how these options work together to define the cut regions.</p>
      <div class="title_division">Merging Faces to be Machined</div>
      <p class="para_division">When there are multiple faces, which lie at the same level, Face Milling automatically attempts to merge the faces into a single region prior to machining. However, if you set the Region Sequencing option to Standard, faces are not merged to preserve the order in which you selected the faces.</p>
      <p class="para_division">The criteria used to merge the faces is dependent upon the Blank Overhang Percentage that you use:</p>
      <ul>
         <li>
            <p class="para_item">If the Blank Overhang Percentage is greater than or equal to 50%, Face Milling automatically merges any faces that are within a distance of 2 * (Tool Diameter + Horizontal Clearance ).</p>
         </li>
         <li>
            <p class="para_item">If the Blank Overhang Percentage is less than 50%, Face Milling automatically merges any faces that are within a distance of 2 * Blank Overhang. This is done to ensure that once faces are merged, they are likely to remain merged after the Blank Overhang is applied.</p>
         </li>
         <li>
            <p class="para_item">It also should be noted that even when some faces get merged based on the above criteria, if there is wall geometry on the part that is not as thick as the merging criteria, the merged region may still be separated again in order to prevent the tool from gouging the wall.</p>
         </li>
      </ul>
   </body>
</html>