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      <title>Ang-Ang Plane</title>
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      <div class="title_topic4" id="xps10_pagetitle">Ang-Ang Plane</div>
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               <p class="para_td"><a class="links" href="javascript:void(0)" onclick="top.openFile('mfgmilling/noncut_moves_ov.html');return(false);">Overview</a></p>
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      </table><br><p class="para_topic"><b class="uiTerm">Ang-Ang Plane</b> specifies an engage move in terms of two angles and a plane. The angles determine the direction of the engage motion and the plane establishes the engage start point.
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            <p class="para_item">A positive <b class="uiTerm">Swing Angle</b> value is measured based on the direction of the first cut. Starting with a vector tangent to the first cut at the first point to be machined, a positive <b class="uiTerm">Swing Angle</b> value is measured counterclockwise in a plane tangent to the part surface.
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            <p class="para_item">A positive <b class="uiTerm">Ramp Angle</b> value is measured clockwise in a plane normal to the part surface containing the vector described by the <b class="uiTerm">Swing Angle</b>. A negative <b class="uiTerm">Ramp Angle</b> value is measured counterclockwise.
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      <p class="para_topic">When you generate the tool path, the tool moves from the engage plane in the direction established by the <b class="uiTerm">Swing Angle</b> and <b class="uiTerm">Ramp Angle</b> to the first point to be machined.
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                  <p class="para_warning_body">CAUTION: In Planar Milling, if the first segment of the boundary is a line, the first segment of the tool path is normally a parallel line. If the first segment of the boundary is an arc, the first segment of the tool path is normally a concentric arc.</p>
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      <p class="para_topic">In certain circumstances the first segment of the boundary will &quot;disappear&quot; from the tool path, in which case the first segment of the tool path is &quot;parallel&quot; to the second segment of the boundary. This happens, for example, when the first segment of the boundary is a concave arc (one whose center lies on the same side of the arc as the tool) and the tool radius plus the side stock exceeds the arc radius.</p>
      <p class="para_topic">Since the engage move is determined by the first segment of the tool path and not the first segment of the boundary, if the first segment of the boundary &quot;disappears&quot; from the tool path, the specified angles and plane may produce an undesirable engage move. You must re&ndash;specify the engage data in this case.</p>
      <p class="para_topic">In the following figures, Angle 1 = <b class="uiTerm">Swing Angle</b>, Angle 2 = <b class="uiTerm">Ramp Angle</b>.
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      <div class="title_figure">Engage Using Ang-Ang Plane</div>
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      <div class="title_figure">Retract Using Ang-Ang Plane</div>
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