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      <title>Surface Area Drive Method Cut Area</title>
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      <div class="title_topic5" id="xps10_pagetitle">Surface Area Drive Method Cut Area</div>
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      <p class="para_topic">Cut Area enables you to define how much of the total Drive Surface area to utilize in the operation by specifying Surface Percentages or Diagonal Points. These options are available only after the Drive Surfaces have been selected.</p>
      <div class="title_division">Surface %</div>
      <p class="para_division">Surface % determines the amount of Drive Surface area to utilize by allowing you to input positive or negative percentage values for the beginning and end of first pass, the beginning and end of the last pass, the first Stepover, and the last Stepover.</p>
      <p class="para_division">When using only one Drive Surface, the entire surface is 100%. For multiple surfaces, 100% is evenly divided by the number of surfaces in that direction. Each surface is given that percentage, regardless of size. In other words, if you have 5 surfaces, each surface is allotted 20%, regardless of its relative size.</p>
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         <p align="center"><img align="bottom" src="graphics/surfc_perctg.gif"></p>
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      <div class="title_figure">Surface Percentages</div>
      <p class="para_division">The Start First point, Start Last point, and Start Step are all referenced at 0%. Entering a value less than 0% (negative percent) extends the cut area beyond the surface edge. Entering a value greater than 0% reduces the cut area.</p>
      <p class="para_division">The End First point, End Last point, and End Step are all referenced at 100%. Entering a value less than 100% reduces the cut area. Entering a value greater than 100% extends the cut area beyond the surface edge.</p>
      <p class="para_division">When extending beyond 0-100%, usually the surface will be extended linearly, tangent to the edge. However, if the surface is analytic, such as a cylinder, then it may extend by continuing along the radius of the cylinder. In either case, the other drive surfaces are not considered in the extension.</p>
      <p class="para_division">Start First and End First refer to the location of the first and last Drive Points for the first pass (computed as a percentage distance along the Cut Direction).</p>
      <p class="para_division">Start Last and End Last refer to the location of the first and last Drive Points for the last pass (computed as a percentage distance along the Cut Direction).</p>
      <p class="para_division">Start Step and End Step are the percentage distances along the Stepover direction (i.e., perpendicular to the first Cut Direction).</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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               <div class="para_note">
                  <p class="para_note_body"> NOTE: Start Last and End Last are not available when more than one Drive Surface is specified.</p>
                  <p class="para_note_body"></p>
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      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/surfperc_defn_cut.gif"></p>
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      <div class="title_figure">Surface Percentages Defining Cut Area</div>
      <div class="title_division">Diagonal Points</div>
      <p class="para_division">Diagonal Points determines the amount of Drive Surface area the operation will utilize by allowing you to select Drive Surface faces and specify diagonal points on those faces defining the area.</p>
      <p class="para_division">First, select a Drive Surface face on which to locate the first diagonal point defining the drive area (face a illustrated below).</p>
      <p class="para_division">Second, specify a point on the selected face to define the first diagonal point of the area (point b below). You may indicate a point anywhere on the face or use the Point Subfunction to select an edge of the face. In the illustration below, point b has been indicated on face a.</p>
      <p class="para_division">Third, select a Drive Surface face on which to locate the second diagonal point defining the drive area (face c below). If the second diagonal point is located on the same face as the first point, select that same face again.</p>
      <p class="para_division">Fourth, specify a point on the selected face to define the second diagonal point of the drive area (point d below). Again, you may indicate a point anywhere on the face or use the Point Subfunction to select an edge of the face. In the illustration below, point d has been specified using the End Point Option in the Point Subfunction to select a corner of face c.</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/diagptsdefn.gif"></p>
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      <div class="title_figure">Diagonal Points Defining Cut Area</div>
      <p class="para_division">Once you have specified the second diagonal point, the system outlines the Drive Surface area to be utilized in the operation.</p>
      <div class="title_division">Pattern</div>
      <p class="para_division">Pattern enables you to define the shape of the tool path. The following options are available in the Surface Area Drive Method.</p>
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            <p class="para_item">Follow Pocket &nbsp; <img align="bottom" src="graphics/follow_pocket.gif" border="0"></p>
         </li>
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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"> NOTE: When using Follow Pocket in the Surface Area Drive Method, you do not have the option of specifying an Inward or Outward pocket direction. The direction is always Inward.</p>
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      <ul>
         <li>
            <p class="para_item">Parallel Lines &nbsp; <img align="bottom" src="graphics/parallel_lines.gif" border="0"></p>
         </li>
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      <ul>
         <li>
            <p class="para_item">Helical:  <img align="bottom" src="graphics/helical.gif" border="0"> &nbsp;This Surface Area cut pattern provides you with the option to cut a part following a helical pattern. &nbsp;Use Helical when you desire a smooth pattern with no step over moves. &nbsp;This capability is appropriate only in cases where the drive surface forms an enclosed cyclical region (e.g. a blade, an engine manifold, etc.). &nbsp;&nbsp;All the restrictions and capabilities of Surface Area method apply to this capability. 
            </p>
         </li>
      </ul>
      <div class="title_division">Cut Type</div>
      <p class="para_division">Cut Type is used in combination with the Parallel Lines cut pattern to define how the cutter moves from one cut pass to the next.</p>
      <ul>
         <li>
            <p class="para_item">Zig-Zag</p>
         </li>
         <li>
            <p class="para_item">Zig-Zag with Lifts</p>
         </li>
         <li>
            <p class="para_item">Zig</p>
         </li>
      </ul>
      <div class="title_division">Zig-Zag</div>
      <p class="para_division">Zig-Zag creates passes that cut in opposite directions while stepping over in one direction.</p>
      <div class="title_division">Zig-Zag with Lifts</div>
      <p class="para_division">Zig-Zag with Lifts enables you to traverse from one cutting pass to the next by cutting in opposite directions. Like Zig-Zag, the tool reverses the direction of cut for consecutive passes. Unlike Zig-Zag, however, Zig-Zag with Lifts retracts, traverses, and engages between parallel passes. Stepovers are non-cutting.</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/zz_lfts_parall.gif"></p>
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      <div class="title_figure">Zig-Zag with Lifts with Parallel Lines Pattern</div>
      <div class="title_division">Zig</div>
      <p class="para_division">Zig is a one-directional cut type that traverses from one cutting pass to the next by retracting, traversing to the start of the next pass, and cutting again in the same direction.</p>
      <div class="title_division">Cut Step</div>
      <p class="para_division">Cut Step controls the distance between Drive Points in the cut direction. The cut step is particularly important when you are machining directly on the Drive Surfaces and when the Tool Axis is defined relative to the Drive Surfaces. The more Drive Points you specify, the more accurately the Tool Path and the Tool Axis follow the contours of the Drive Surfaces.</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/cutstep.gif"></p>
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      <div class="title_figure">Cut Step</div>
      <p class="para_division">You can control the Cut Step by specifying Tolerance or by specifying Number of Points.</p>
      <div class="title_division">Tolerances</div>
      <p class="para_division">Tolerances allows you to specify Intol and Outol values. These values define the maximum allowable normal distance between the Drive surface and the line extending between two consecutive Drive Points. Drive Points are generated in such a way that this normal distance does not exceed the specified tolerance. A very small tolerance causes many Drive Points to be created very close together. The more Drive Points you create, the more closely the Tool Path and Tool Axis follow the Drive Surface.</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/cutstep_inoutol.gif"></p>
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      <div class="title_figure">Cut Step Defined by Intol/Outol</div>
      <div class="title_division">Number</div>
      <p class="para_division">Number allows you to specify the minimum number of Drive Points to create along cut passes during tool path generation. Additional points are automatically created if necessary for the Tool Path to follow the Part Surface contours within the specified Part Surface Intol/Outol values. It is advised that you select a big enough number along the drive cut path to capture the shape and features of the drive geometry; otherwise unexpected results may occur.</p>
      <p class="para_division">The selected cut Pattern determines the numeric values you may enter. If the Pattern you selected is Parallel Lines, you may specify the number of points along the First and along the Last Cut pass. If you assign different values to these two passes, the system generates a gradient of points for the passes (if any) in between the First Cut and the Last Cut.</p>
      <p class="para_division">If you selected Follow Pocket as the Pattern, you may specify the number of points along the First Cut, Second Cut, and Third Cut directions (corresponding to the Cut Direction, Stepover Direction, and the direction opposite the Cut Direction).</p>
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