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      <title>Mill Boundary</title>
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      <div class="title_topic4" id="xps10_pagetitle">Mill Boundary</div>
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      <p class="para_topic">Boundaries define areas that constrain cutting moves. These areas may be defined by either a single boundary that contains the tool or by a combination of boundaries that both contain and exclude the tool. The behavior, usage, and availability of boundaries differ depending on the machining module in which they are used. All boundaries, however, have certain common characteristics regardless of their application.</p>
      <p class="para_topic">The following descriptions are general overviews of each type of boundary. Refer to the Boundaries section of this documentation for details on boundary creation and usage.</p>
      <div class="title_division"> Part Boundary</div>
      <p class="para_division">The following figure illustrates one of the most common uses of a boundary. A single part boundary in a Planar Mill operation defines the cut volume from which material is removed. The part boundary contains the tool while cutting the part, the floor defines the depth.</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/bound_intrfi03.gif"></p>
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      <div class="title_figure">Part Boundary defining Cut Volume</div>
      <div class="title_division"> Blank Boundary</div>
      <p class="para_division">Part and blank boundaries may be used together to define the cut volume. In the following figure, the cut volume is defined by the difference in volumes specified by a single blank boundary and multiple part boundaries.</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/bound_intrfi02.gif"></p>
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      <div class="title_figure">Cut Volume Defined by Part and Blank Boundaries</div>
      <div class="title_division"> Check Boundary</div>
      <p class="para_division">Check boundaries are used in addition to the specified part geometry (whether the part geometry is defined by boundaries, surface regions, bodies, faces, or curves) to define areas the tool must avoid. Always define check boundaries at the top of the geometry you want to avoid. NX determines the volume of material to avoid by projecting the boundary downward from the boundary plane.</p>
      <p class="para_division">In the following figure, check boundaries define holding clamps in a Planar Mill operation.</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/bound_intrfi25.gif"></p>
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      <div class="title_figure">Check Boundaries Defining Clamps</div>
      <div class="title_division">Trim Boundary</div>
      <p class="para_division">Trim boundaries are used in combination with the specified part geometry to discard or trim away a portion of the cut region. In the following figure, a trim boundary trims away all parts of the cut region outside the trim boundary in a Cavity Mill operation.</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/bound_intrfi24.gif"></p>
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      <div class="title_figure">Trim Boundary Restricting Cut Region</div>
      <div class="title_division"> Floor (Planar Mill Operations)</div>
      <p class="para_division">Floor defines the lowest (last) cut level for Planar Mill operations. All cut levels are generated parallel to the Floor plane. Only one Floor can be defined per operation. Redefining the Floor automatically replaces the existing Floor.</p>
      <p class="para_division">The following figure illustrates an example of how the Floor correctly defines the lowest cut level when a Blank boundary is used.</p>
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         <p align="center"><img align="bottom" src="graphics/parent_figurespl59.gif"></p>
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      <div class="title_figure">Floor Defining Lowest Level of Blank Geometry</div>
      <p class="para_division">The following figure illustrates an example of how the Floor correctly defines the lowest cut level when only Part boundaries are used.</p>
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         <p align="center"><img align="bottom" src="graphics/parent_figurespl60.gif"></p>
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      <div class="title_figure">Floor Defining Lowest Level of Part Geometry</div>
      <p class="para_division">The cutter must be able to reach the Floor without gouging the part. If the Floor defines a cut level that is inaccessible as illustrated below, an error message is displayed.</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/parent_confi02.gif"></p>
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      <div class="title_figure">Inaccessible Floor plane</div>
      <p class="para_division">If you do not specify a Floor, the system uses the X-Y plane of the Machine Coordinate System (MCS).</p>
      <div class="title_division">Offsets</div>
      <p class="para_division"><b class="uiTerm">Part Offset</b>, <b class="uiTerm">Blank Offset</b>, <b class="uiTerm">Check Offset</b>, and <b class="uiTerm">Trim Offset</b> let you modify the part, blank, check and trim boundaries. Enter a value to offset the boundary from the geometry you selected to define the boundary.
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      <div class="title_division"> Layout/Layer</div>
      <p class="para_division">You may save the layout and layer of the orientation. This may be desired because machining the part from a specific orientation may be best viewed by looking at the part from a specific orientation on the screen. This does not allow you to specify this data, but only to save the current settings. To save the layout and layer, simply select the Save Layout/Layer button from the Mill Boundary dialog.</p>
      <p class="para_division">To access a saved layout and layer orientation follow the path below. </p>
      <p class="para_division">Right mouse button click on the object&rarr; Object&rarr; Switch Layer/Layout. </p>
      <p class="para_division">The system changes the working layer and retrieves the display layout that was active when Save Layout/Layer was selected. </p>
      <p class="para_division">For more information on how to select geometry, see the  <a class="links" href="javascript:void(0)" onclick="top.openFile('mfggeneral/bdry_geo_dialog.html');return(false);">Boundary Geometry</a> section under Temporary Boundaries. 
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