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      <title>Total Depth</title>
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      <div class="title_topic2" id="xps10_pagetitle">Total Depth</div>
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      <p class="para_topic">Total Depth allows you to select the method and the amount of material to remove while roughing by specifying the thread depth and taper angle. This option also allows you to specify the manner in which the tool proceeds as it feeds to the roughing thread depth. You can specify the total depth either by selecting a root line or by entering depth and angle values. When using the root line method, total depth is the distance from the crest line to the root line.</p>
      <p class="para_topic">Total depth is the sum of the rough thread depth plus the finish thread depth.</p>
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         <p align="center"><img align="bottom" src="graphics/lathe/lthread_deAt02.gif"></p>
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      <div class="title_figure">Total Depth where</div>
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            <td colspan="1" rowspan="1">
               <p class="para_td">A</p>
            </td>
            <td colspan="1" rowspan="1">
               <p class="para_td">Crest Line</p>
            </td>
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         <tr valign="top">
            <td colspan="1" rowspan="1">
               <p class="para_td">B</p>
            </td>
            <td colspan="1" rowspan="1">
               <p class="para_td">Root Line</p>
            </td>
         </tr>
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            <td colspan="1" rowspan="1">
               <p class="para_td">C</p>
            </td>
            <td colspan="1" rowspan="1">
               <p class="para_td">Total Depth</p>
            </td>
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         <tr valign="top">
            <td colspan="1" rowspan="1">
               <p class="para_td">D</p>
            </td>
            <td colspan="1" rowspan="1">
               <p class="para_td">Roughing Thread Depth</p>
            </td>
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            <td colspan="1" rowspan="1">
               <p class="para_td">E</p>
            </td>
            <td colspan="1" rowspan="1">
               <p class="para_td">Finish Thread Depth</p>
            </td>
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      </table><br><div class="title_division">Select Root Line</div>
      <p class="para_division">Selecting a root line establishes both the total depth and the thread angle. The system does not recalculate the thread angle if you reselect a crest line after you have selected a root line. It does recalculate the depth.</p>
      <div class="title_division">Enter Depth and Angle</div>
      <p class="para_division">If you enter depth and angle values rather than selecting a root line, then the system recalculates the thread angle if you reselect a crest line. In this case it does not recalculate the depth.</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">A thread angle is used to produce a tapered thread (such as a pipe thread). </p>
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      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/lathe/lthread_deAt01.gif"></p>
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      <div class="title_figure">Thread Angle where</div>
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         <tr valign="top">
            <td colspan="1" height="19" rowspan="1">
               <p class="para_td">A</p>
            </td>
            <td colspan="1" height="19" rowspan="1">
               <p class="para_td">Angle</p>
            </td>
         </tr>
         <tr valign="top">
            <td colspan="1" rowspan="1">
               <p class="para_td">B</p>
            </td>
            <td colspan="1" rowspan="1">
               <p class="para_td">Crest Line</p>
            </td>
         </tr>
         <tr valign="top">
            <td colspan="1" rowspan="1">
               <p class="para_td">C</p>
            </td>
            <td colspan="1" rowspan="1">
               <p class="para_td">Total Depth</p>
            </td>
         </tr>
      </table><br><div class="title_division">Increment</div>
      <p class="para_division">Increment allows you to specify the method by which the roughing thread depth is reached. The system makes each roughing thread pass you define at the appropriate incremental depth.</p>
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            <td valign="top" align="left"><img align="left" src="../graphics/note.gif" alt="Note" title="Note"></td>
            <td valign="bottom" align="left" width="100%">
               <div class="para_note">
                  <p class="para_note_body">  &nbsp;For the last two incremental passes, if the remaining material exceeds the next to last increment by less than the increment tolerance, the system makes one pass at the remaining depth. Otherwise, the system makes two passes, each at an increment of one half the remaining depth.</p>
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      <div class="title_division">Constant</div>
      <p class="para_division">Constant allows you to specify a single increment value. You may wish to use this method when specifying relatively few roughing passes since tool pressure rapidly increases with each pass. The system cuts at the specified constant depth until it reaches the total roughing depth.</p>
      <div class="title_division">Variable</div>
      <p class="para_division">Variable allows you to specify a set of variable increments and the number of times each is to be repeated. This allows the greatest control over individual passes.</p>
      <p class="para_division">If the sum of the increments does not equal the roughing thread depth, the system repeats the last non-zero increment value until the appropriate depth is reached. If the sum of the increments exceeds the roughing thread depth, the system ignores the excess increments.</p>
      <div class="title_division">Percentage</div>
      <p class="para_division">Percentage is particularly useful in roughing threads because it resembles the finishing technique (even allowing you to bypass that option and using the chase option instead).</p>
      <p class="para_division">This method allows you to specify the increment depth of each pass as a percentage of the total roughing depth that remains at the time of the pass. This causes step distances to decrease as the tool moves deeper into the thread.</p>
      <p class="para_division">As the tool approaches the roughing thread depth, the increment depth can become very small. Therefore, to control the increments, you must enter a minimum increment value (in mm or inch) so that the system can reach the roughing thread depth. When the percentage calculation result is less than the minimum value, the system uses the minimum value on each remaining pass until the tool reaches the roughing thread depth.</p>
      <p class="para_division">You can also specify a maximum increment value so that the tool does not feed too far into the thread during the initial threading passes.</p>
      <div class="figure">
         <p align="center"><img align="bottom" src="graphics/lathe/lthread_deAt11.gif"></p>
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      <div class="title_figure">Percentage Increment Method</div>
      <div class="title_division">Tolerance</div>
      <p class="para_division">Each of these increment methods allows you to enter a tolerance value, thus enabling you to specify a minimum value which controls at what increment the last roughing thread passes are made.</p>
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