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      <div class="title_topic4" id="xps10_pagetitle">Datums</div>
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      <p class="para_topic"><img align="bottom" src="graphics/commandref/ideas_logo.gif" border="0"><img align="bottom" src="graphics/commandref/arrow.gif" border="0"><img align="bottom" src="graphics/commandref/nx_logo.gif" border="0"></p>
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      <p class="para_topic"></p><a name="qt_mm_1_2"></a><dl>
         <dt><a name="ndxgenid_roadmap651"></a><a name="ndxgenid_roadmap652"></a><p class="defObject"><img align="bottom" src="graphics/commandref/ideas_rule.gif" border="0"><br><img align="bottom" src="graphics/ideas/des_mm_coord_sys.gif" border="0"> <img align="bottom" src="graphics/ideas/des_mm_coord_hier.gif" border="0"> <b class="uiTerm">Coordinate Systems</b>, <b class="uiTerm">Coordinate Hierarchy</b></p>
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            <p class="para_defMeaning"><img align="bottom" src="graphics/commandref/nx_rule.gif" border="0"></p>
            <p class="para_defMeaning">To create a coordinate system for sketching, use a <b class="uiTerm">Datum CSYS</b>.
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            <p class="para_defMeaning"><img align="bottom" src="graphics/icons/icon-datumcsys.gif" border="0"> <b class="uiTerm">Datum CSYS</b> (<b class="uiTerm">Feature</b> toolbar) or <b class="uiTerm">Insert</b> &rarr; <b class="uiTerm">Datum/Point</b> &rarr; <b class="uiTerm">Datum CSYS</b></p>
            <p class="para_defMeaning">The <b class="uiTerm">WCS</b> (Working Coordinate System) functions as a movable coordinate system like the I-deas workplane. Use <b class="uiTerm">Format</b> &rarr; <b class="uiTerm">WCS</b> &rarr; <b class="uiTerm">Save</b> to keep multiple coordinate systems.
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            <p class="para_defMeaning"><img align="bottom" src="graphics/icons/icon-wcsdynamics.gif" border="0"> <b class="uiTerm">WCS Dynamics</b> (<b class="uiTerm">Utility</b> toolbar) or <b class="uiTerm">Format</b> &rarr; <b class="uiTerm">WCS</b> menu
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            <p class="para_defMeaning">See also:</p>
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                  <p class="para_defMeaning"><a class="links" href="javascript:void(0)" onclick="top.openFile('roadmap/05qt_parts_21.html');return(false);">Datum CSYS</a></p>
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                  <p class="para_defMeaning"><a class="links" href="javascript:void(0)" onclick="top.openFile('roadmap/02qt_nx_basics_36.html');return(false);">WCS</a></p>
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         <dt><a name="ndxgenid_roadmap653"></a><p class="defObject"><img align="bottom" src="graphics/commandref/ideas_rule.gif" border="0"><br><img align="bottom" src="graphics/ideas/des_mm_ref_pl.gif" border="0"> <img align="bottom" src="graphics/ideas/des_mm_ref_li.gif" border="0"> <img align="bottom" src="graphics/ideas/des_mm_ref_pt.gif" border="0"> <b class="uiTerm">Reference Planes</b>, <b class="uiTerm">Reference Lines</b>, <b class="uiTerm">Reference Points</b></p>
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            <p class="para_defMeaning"><img align="bottom" src="graphics/commandref/nx_rule.gif" border="0"></p>
            <p class="para_defMeaning"><img align="bottom" src="graphics/icons/icon-datumplane.gif" border="0"> <b class="uiTerm">Datum Plane</b> (<b class="uiTerm">Feature</b> toolbar) or <b class="uiTerm">Insert</b> &rarr; <b class="uiTerm">Datum/Point</b>  &rarr; <b class="uiTerm">Datum Plane</b></p>
            <p class="para_defMeaning"><img align="bottom" src="graphics/icons/icon-datumaxis.gif" border="0"> <b class="uiTerm">Datum Axis</b> (<b class="uiTerm">Feature</b> toolbar) or <b class="uiTerm">Insert</b> &rarr; <b class="uiTerm">Datum/Point</b> &rarr; <b class="uiTerm">Datum Axis</b></p>
            <p class="para_defMeaning"><img align="bottom" src="graphics/icons/icon-datumcsys.gif" border="0"> <b class="uiTerm">Datum CSYS</b> (<b class="uiTerm">Feature</b> toolbar) or <b class="uiTerm">Insert</b> &rarr; <b class="uiTerm">Datum/Point</b> &rarr; <b class="uiTerm">Datum CSYS</b></p>
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                     <div class="para_tip">
                        <p class="para_tip_body">Put datums on a separate layer. Make the layer invisible to hide the datums.</p>
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            <p class="para_defMeaning">See also:</p>
            <ul class="unmarkedList">
               <li>
                  <p class="para_defMeaning"><a class="links" href="javascript:void(0)" onclick="top.openFile('roadmap/05qt_parts_21.html');return(false);">Datum features</a></p>
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            <p class="defObject"><img align="bottom" src="graphics/commandref/ideas_rule.gif" border="0"><br><img align="bottom" src="graphics/ideas/des_mm_ref_curves.gif" border="0"> <b class="uiTerm">Reference Curves</b></p>
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         <dd>
            <p class="para_defMeaning"><img align="bottom" src="graphics/commandref/nx_rule.gif" border="0"></p>
            <p class="para_defMeaning">Reference curves have a different meaning in NX. Convert curves in a sketch to reference curves to use them as construction lines or centerlines that are part of the sketch, but are not part of the extruded or swept feature. </p>
            <p class="para_defMeaning"><img align="bottom" src="graphics/icons/icon_convert_to_from_reference.gif" border="0"> <b class="uiTerm">Convert To/From Reference</b> (<b class="uiTerm">Sketch Constraints</b> toolbar)
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            <p class="para_defMeaning">See also:</p>
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               <li>
                  <p class="para_defMeaning"><a class="links" href="javascript:void(0)" onclick="top.openFile('roadmap/05qt_parts_18.html#qt_parts_reference_curves');return(false);">Reference curves</a></p>
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