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      <title>Insert/Modify</title>
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      <div class="title_topic4" id="xps10_pagetitle">Insert/Modify</div>
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      <p class="para_topic">Insert allows you to add or change sub-operations. This button becomes selectable only after the Engage sub-operation has been defined. Then, Insert may be changed to Modify, allowing you to change existing sub-operations.</p>
      <p class="para_topic">If a sub-operation name is selected in the list, Insert adds a new sub-operation immediately after the selected name. If the operation name at the very top of the list is selected, Insert adds a new first sub-operation.</p>
      <div class="title_division">Sub-Operation Type</div>
      <p class="para_division">The Sub-Operation Type button allows you to switch between the four sub-operation dialog boxes. These four dialog boxes enable you to create all of the tool motions required for sequential milling. This section describes the Engage dialog box in detail. The Continuous Path, Retract, and Point to Point dialog boxes are illustrated and described in detail in the following sections of this chapter.</p>
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      <div class="title_division">Engage</div>
      <p class="para_division">Engage is initially displayed when creating an operation. An engage is a movement from an avoidance geometry position to an initial cutting position on the part. It can be defined as a three surface engage (drive surface, part surface, check surface), or a two surface engage (drive surface, part surface). After this initial move, the dialog box automatically changes to the Continuous Path Motion dialog.</p>
      <div class="title_division">Cont. Path</div>
      <p class="para_division">Continuous Path enables you to create a sequence of cutting movements from one drive surface to the next. Most of the Sequential Mill sub-operations are created using this option.</p>
      <div class="title_division">Retract</div>
      <p class="para_division">Retract enables you to create a non-cutting move from the part back to the avoidance geometry or to a defined retract point.</p>
      <div class="title_division">Pt to Pt</div>
      <p class="para_division">Point To Point enables you to create linear, non-cutting sub-operations. It is used to quickly move the tool to another area where continuous path motions can then continue.</p>
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