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      <title>Zig-Zag Surface</title>
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      <div class="title_topic2" id="xps10_pagetitle">Zig-Zag Surface</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">Zig-Zag Surface is a processor that was used in the 1980's and 1990's. It is now obsolete and should not be used for new work. &nbsp;&nbsp;Because it is obsolete the documentation will no longer be updated or maintained in any way. &nbsp;&nbsp; <a class="links" href="javascript:void(0)" onclick="top.openFile('mfgmilling/drive_areamill.html');return(false);">Area Milling</a> should be used for work originally done with Zig-Zag Surface. 
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      <p class="para_topic">Zig-Zag Surface machining is designed for contour machining a single trimmed surface. Zig-Zag Surface also provides the capability to offset the tool from holes trimmed in the surface (by the radius of the tool plus any specified stock). You can specify a tool path direction or accept a system-generated tool path direction. Both Zig and Zig-Zag cut types are available.</p>
      <p class="para_topic">Zig-Zag Surface tool paths are generated in parallel passes, using a chordal approximation of the surface to be machined. You can control the number of input points by a chordal deviation in the direction of cut. This is the allowable deviation from the surface. Scallop Height controls the distance between parallel passes according to the maximum height of material (scallop) you specify to be left between passes. This is affected by the cutter definition and the curvature of the surface.</p>
      <p class="para_topic">Zig-Zag Surface also provides gouge check so that the system can check for violation of the surface. You have the following options available:</p>
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               <p class="para_th">Surface Selection Methods</p>
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               <p class="para_td">Specify Edge Tolerance, Stock, and Gouge Check Area</p>
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               <p class="para_th">Modify Hole Selection</p>
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               <p class="para_td">Edit Hole List, specify Tolerance and Stock</p>
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               <p class="para_th">Part Geometry</p>
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               <p class="para_td">Reselects the surface to be machined and to respecifies the hole data</p>
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               <p class="para_th">Avoidance Geometry</p>
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               <p class="para_td">Specifies, activates (or cancels) geometry used for non-cutting moves</p>
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               <p class="para_th">Display Options</p>
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               <p class="para_td">Determines how the tool and tool path are displayed on the screen</p>
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               <p class="para_th">Machine Control</p>
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               <p class="para_td">Redefines the cutting tool and enters post processor commands in the tool path</p>
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               <p class="para_th">Feeds</p>
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               <p class="para_td">Specifies feedrate values for different types of tool movements</p>
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               <p class="para_th">Engage Retract</p>
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               <p class="para_td">Secifies tool motion to bring the tool safely into or away from the part</p>
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               <p class="para_th">Fl Stck/Min Clr</p>
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               <p class="para_td">Specifies a value by which the tool or tool path is offset</p>
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               <p class="para_th">Tool Axis</p>
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               <p class="para_td">Specifies a value by which the tool or tool path is offset</p>
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               <p class="para_th">Material Side</p>
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               <p class="para_td">Determines which side of the part surface machined</p>
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               <p class="para_th">Step Tolerances</p>
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               <p class="para_td">Sets two variables that determine sur face roughness</p>
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               <p class="para_th">Cut Type</p>
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               <p class="para_td">Zig or Zig-Zag</p>
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               <p class="para_th">Step Type/Dir</p>
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               <p class="para_td">Specifies the cut direction method</p>
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               <p class="para_th">Offset/Gouge</p>
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               <p class="para_td">Different methods of surface checking</p>
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               <p class="para_th">Verify Points</p>
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               <p class="para_td">Displays contact points the system uses in calculating the cutter path</p>
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      </table><br><p class="para_topic">Avoidance Geometry, Display Options, Machine Control, and Feeds are common to all cutting options and are discussed in the Common Options section.</p>
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         <p align="center"><img align="bottom" src="graphics/zigzag_intat03.gif"></p>
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      <div class="title_figure">Zig-Zag Surface Machining</div>
      <div class="title_division">Interactive Sequence</div>
      <p class="para_division">The following are the general interactive steps involved in the Zig-Zag Surface operation:</p>
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         <li>
            <p class="para_item">Describe the cutter.</p>
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         <li>
            <p class="para_item">Select the surface to be machined.</p>
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            <p class="para_item">Select holes.</p>
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         <li>
            <p class="para_item">Set the remaining operation parameter values and status (e.g., tool path direction and type, tool axis, start point, clearance plane, feed rates).</p>
         </li>
         <li>
            <p class="para_item">Generate, and either accept or reject the tool path.</p>
         </li>
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      <p class="para_division">Specify the output path name and enter any desired Edge Tol, Stock, and/or Gouge Check Area values before you select the surface.</p>
      <p class="para_division">Interactive Input also can be defined at the boundary level, at the boundary member level, and the group level, using Custom Boundary Data.</p>
      <p class="para_division">The following pages provide a description of the surface selection methods available.</p>
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