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      <title>Parent Group Milling</title>
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      <div class="title_topic4" id="xps10_pagetitle">Parent Group Milling</div>
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      <p class="para_topic">When you set the Type to Milling Tool, the New option allows you to create tools for milling operations. You may create the following types of Milling Tools:</p>
      <p align="center"><img align="bottom" src="graphics/parent_tool_millifi15.gif"></p>
      <p align="center"><img align="bottom" src="graphics/parent_tool_millifi14.gif"></p>
      <p align="center"><img align="bottom" src="graphics/parent_tool_millifi13.gif"></p>
      <p class="para_topic"> <a class="links" href="javascript:void(0)" onclick="top.openFile('mfggeneral/parent_groups_ball_mill.html');return(false);">Ball Mill</a> 
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      <p align="center"><img align="bottom" src="graphics/parent_ball_mill.gif"></p>
      <div class="title_division">Valid Cutter Shapes</div>
      <p class="para_division">The 5, 7, and 10 parameter milling tools allow you to define a variety of differently shaped tools.</p>
      <p align="center"><img align="bottom" src="graphics/parent_tool_millifi04.gif"></p>
      <p align="center"><img align="bottom" src="graphics/parent_tool_millifi03.gif"></p>
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                  <p class="para_note_body">These pictures represent the mathematical definitions of the valid shapes. Not all of the parameters in the pictures are used in the tool definition dialogs.</p>
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      <p class="para_division">The following cutter shape is valid if you choose to create a Barrel Cutter:</p>
      <p align="center"><img align="bottom" src="graphics/parent_tool_millifi12.gif"></p>
      <div class="title_division">Invalid Cutter Shapes</div>
      <p class="para_division">The following figure illustrates some tool shapes that may not be defined in NX.</p>
      <p align="center"><img align="bottom" src="graphics/parent_tool_millifi11.gif"></p>
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                  <p class="para_note_body"> The shapes a, b, c, d, f, and g are not valid because their surface normals intersect. Shape e is not valid because the length h is too small for the diameter d and the tip angle a.</p>
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      <div class="title_division">Milling Tool Rules</div>
      <p class="para_division">Observe the following rules when you create a Milling tool:</p>
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            <p class="para_item">The values you enter for Diameter, Lower Radius, Length, Tip Angle, and Flute Length, must all be non-negative.</p>
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         <li>
            <p class="para_item">The Taper Angle must be greater than -90 degrees and less than 90 degrees.</p>
         </li>
         <li>
            <p class="para_item">The Tip Angle must be less than 90 degrees.</p>
         </li>
         <li>
            <p class="para_item">The Taper Angle plus the Tip Angle be less than 90 degrees.</p>
         </li>
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            <p class="para_item">The Flute Length must not be greater than the Length of the tool.</p>
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         <li>
            <p class="para_item">The Number of Flutes must be positive.</p>
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            <p class="para_item">The Length must not be too small for the Diameter and Tip Angle. See the section Invalid Cutter Shapes, shape.</p>
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            <p class="para_item">The Lower Radius is constrained by the side (Tip Angle and Taper Angle, if any) and the bottom of the tool.</p>
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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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                  <p class="para_note_body"> The software displays an appropriate error message each time you deviate from the above restrictions. For example, if you enter a Diameter value of -.2000, the software displays the error message Diameter Cannot Be Negative. Choose OK and the software returns control to the data specification menu with the illegal data displayed. You can then enter the appropriate data.</p>
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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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                  <p class="para_note_body"> Only use the 7 and 10 parameter milling tools for Planar Milling, Surface Contouring, and Sequential Mill. Other milling operations ignore the extended definitions of these tools.</p>
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