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      <title>Defining a Tool Mount Junction</title>
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      <div class="title_topic2" id="xps10_pagetitle">Defining a Tool Mount Junction</div>
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      <p class="para_topic">When you use the <b class="uiTerm">Machine Tool Builder</b>, how you define the tool mount junction depends on whether a tool assembly part file exists.
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            <p class="para_item">If no tool assembly part file exists, the X-axis of the tool mount junction must point from the tool tip to the gauge point.</p>
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            <p class="para_item">If a tool assembly part file exists, you can create a mounting junction and also a tool tip junction in the tool assembly part file. You do this with the following steps:</p>
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                  <p class="para_item">Open the tool assembly part file and go to the <b class="uiTerm">Machine Tool Builder</b> application.
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                  <p class="para_item">Create a tool base component and add all the tool geometry.</p>
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                  <p class="para_item">Create two junctions within the tool base and classify them as <b class="uiTerm">Tool Mount</b> and <b class="uiTerm">Tool Tip</b>.
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      <p class="para_topic">When the system mounts a tool to the turret or spindle, it first looks for the mounting junction in the tool assembly. If it finds it, it aligns the mounting junction in the tool assembly coincident with the mounting junction in the machine. If there is no mounting junction in the tool assembly, the system aligns the absolute CSYS of the tool assembly part coincident with the mounting junction on the machine side. All the example tools are designed so that the machine adapter of the tool points in the positive X-direction.</p>
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                  <p class="para_note_body">The MTCS is the same as the machine-zero junction and should be defined in the <b class="uiTerm">Machine Tool Builder</b> application. The coordinates in the high level commands SIM_move_linear(circular)_mtcs &nbsp;refer to the  <a class="links" href="javascript:void(0)" onclick="top.openFile('mfgisv/mfgisv_setup_coord_sys_in_mtd.html');return(false);">MTCS</a>. &nbsp;Choose its origin so that initialization, tool changes, and finalization simulate appropriately. The gauge point of the machine at rest is often a good choice as origin. 
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