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      <title>Behavior at Floor Edges</title>
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      <div class="title_topic3" id="xps10_pagetitle">Behavior at Floor Edges</div>
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      <p class="para_topic">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;Those limitations are that the walls of the pocket are planar and perpendicular to the floor of the pocket (see number one in the figure below). &nbsp;In cases where the pocket walls have a taper (Example two in the figure below) or there are blends between the walls and floor of the pocket ( Example three in the figure below), Face Milling may still be used, but there may be some material that is left uncut. To minimize the uncut material, turn <b class="uiTerm">Prevent Undercutting</b> off.
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      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/fm_wall.gif"></p>
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      <div class="title_figure">Floor Edges in Face Milling</div>
      <p class="para_topic">The figure above shows three different situations where the floor meets the wall. &nbsp;In cases two and three, the amount of material left between the floor and walls depends upon the <b class="uiTerm">Prevent Undercutting</b> option used.
      </p>
      <p class="para_topic">When <b class="uiTerm">Prevent Undercutting</b> is turned on, the tool, including the corner radius, is treated as a solid cylinder. The part body is sliced at the cutting levels and the resulting part sections are offset by the tool cylinder radius. These part outlines are then subtracted from the face outlines to determine the area to cut. This technique is conservative and may leave some material uncut between the floor and walls of the pocket.
      </p>
      <p class="para_topic">When<b class="uiTerm"> Prevent Undercutting</b> is turned off, the contact point between the tool and wall is determined more exactly, minimizing the amount of uncut material between the floor and wall.
      </p>
      <div class="title_division">Perpendicular Walls</div>
      <p class="para_division">The figure below shows the first pocket condition: planar walls that are perpendicular to the floor. This condition is handled the same regardless of the <b class="uiTerm">Prevent Undercutting</b> option.
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      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/corner.gif"></p>
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      <div class="title_figure">Pocket with planar walls that are perpendicular to the floor </div>
      <div class="title_division">Walls with Taper</div>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/concave_wall.gif"></p>
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      <div class="title_figure">Pocket walls with a taper and Prevent Undercutting on</div>
      <p class="para_division">In the figure above, <b class="uiTerm">Prevent Undercutting</b> is turned on and the cutter won't move beyond the right of the dotted line. Therefore, uncut material may remain. The figure below shows the same pocket with <b class="uiTerm">Prevent Undercutting</b> off. The tool cuts to the point where it first contacts the wall.
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      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/fmill_undercut_on-taper.gif"></p>
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      <div class="title_figure">Pocket walls with a taper and Prevent Undercutting off</div>
      <div class="title_division">Walls with Blends</div>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/blend.gif"></p>
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      <div class="title_figure">Blend between the wall and floor of the pocket with Prevent Undercutting on</div>
      <p class="para_division">In the figure above, <b class="uiTerm">Prevent Undercutting</b> is turned on and the cutter won't move beyond the right of the dotted line.  Therefore, the material extending from the blend to the wall is left uncut.
      </p>
      <p class="para_division">The figure below shows the same pocket with <b class="uiTerm">Prevent Undercutting</b> off. The tool cuts up to where the cutter's lower radius contact0s the wall.
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      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/fmill_undercut_on1.gif"></p>
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      <div class="title_figure">Blend between the wall and floor of the pocket with Prevent Undercutting off</div>
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            <td valign="top" align="left"><img align="left" src="../graphics/note.gif" alt="Note" title="Note"></td>
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               <div class="para_note">
                  <p class="para_note_body">See <a class="links" href="javascript:void(0)" onclick="top.openFile('mfgmilling/cav_cut_undrct_handlg.html');return(false);">Prevent Undercutting</a> for more information on using <b class="uiTerm">Prevent Undercutting</b>.
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