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      <title>Use Tool Holder in Cavity Milling</title>
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      <div class="title_topic3" id="xps10_pagetitle">Use Tool Holder in Cavity Milling</div>
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      <p class="para_topic">Cavity Milling, Zlevel Milling</p>
      <p class="para_topic">The Use Tool Holder option helps you avoid collisions with the holder and use the shortest possible tool for operations. Turn this option on when you want the tool holder used to contain the path. </p>
      <p class="para_topic">The system first checks for holder collisions against the in process workpiece (IPW) or the blank geometry, part geometry, and check geometry.</p>
      <p class="para_topic">The tool holder shape plus the minimum clearance value is used to ensure a safe distance from the geometry. Any areas that would cause a collision are removed from the cut regions, so the resulting tool path cuts only material that can be removed without the holder colliding. The removed material is updated after each level is cut to maximize the cutting range and allow for greater holder accessibility at the lower levels. You must cut the removed (collision) regions with a longer tool in a follow-up operation.</p>
      <p class="para_topic">An effective practice is to use a sequence of Cavity Milling operations with progressively longer tools, tool holder checking, and the IPW. This lets you machine the most material with the shortest tool. The longer tools only machine the remaining material. To avoid tool paths that remove very little material, you can also set the minimum amount of material to remove. </p>
      <p class="para_topic">See  <a class="links" href="javascript:void(0)" onclick="top.openFile('mfgmilling/cav_mill-tool_seq.html');return(false);">Multiple Length Tool Sequences</a> for information on automating this process.
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      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/cav_mill-tool_hold_chk2.gif"></p>
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      <div class="title_figure">Translucent Level Based IPW Shown with Part</div>
      <p class="para_topic">For more information on Use Tool Holder, see  <a class="links" href="javascript:void(0)" onclick="top.openFile('mfgmilling/com_millop_use_tl_hold.html');return(false);">Use Tool Holder</a> in Common Cutting Options.
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      <div class="title_division">Tool Holder Clearance</div>
      <p class="para_division">To give the tool holder additional clearance, specify a minimum distance that it must keep away from the part, check, and IPW geometry. To do this:</p>
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            <p class="para_item">Select Method on the main operation dialog.</p>
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            <p class="para_item">Enter a value in the Minimum field on the Engage/Retract dialog.</p>
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      <p class="para_division">The Minimum value applies to the 3D distance from the geometry or IPW. </p>
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         <p align="center"><img align="bottom" src="graphics/tool_hold-min_dist.gif"></p>
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      <div class="title_figure">Minimum (Clearance) Value of .100</div>
      <div class="title_division">Minimum Volume Percent</div>
      <p class="para_division">Use Minimum Volume Percent to define how much of the remaining material that an operation must cut to output its tool path. If an operation doesn't meet this percentage, its tool path is suppressed from output and doesn't affect the IPW. The Path column in the Operation Navigator shows a status of suppressed  <img align="bottom" src="graphics/checkbox_dashed_sc.gif" border="0"> for the operation's tool path, and the operation row is displayed in the suppressed path color.
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      <p class="para_division">The Volume Removed percentage reported is based on the machining regions that were actually cut compared to what could have been cut. The areas removed from machining include regions that would cause a tool holder collision.</p>
      <p class="para_division">Use this option, when defining a sequence of operations, to avoid a tool change for an operation that doesn't cut very much material. You may decide it's more efficient to skip that operation and let the operation with the next longer tool cut the material. &nbsp;</p>
      <p class="para_division">For information on creating a tool sequence to automate this process, see  <a class="links" href="javascript:void(0)" onclick="top.openFile('mfgmilling/cav_mill-tool_seq.html');return(false);">Multiple Length Tool Sequences</a>.
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