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<article data-uid="Technique-AssemblyAnchors">
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<h1 id="assembly-anchors">Assembly Anchors</h1>
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<p>How the parts of a machining scene are held together. Assembly in HiNC is not a placement step but a
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statement of coincidence: two named anchors are declared equal, and everything they belong to moves
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so that they are. The buckle anchors below are the joints the machine, fixture, workpiece and tool
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are assembled at.</p>
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<p>Ordered from what an anchor is, to the two chains built out of them.</p>
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<h2 id="what-an-anchor-is">What an Anchor Is</h2>
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<p><strong>Anchors</strong> are used for assembly purposes. When anchors between geometries coincide, assembly is completed.</p>
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<p>Strictly speaking, an <strong>Anchor</strong> is not a point, but a coordinate system. For two coordinate systems to be equal, their origins must coincide and their rotation directions must be the same.</p>
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<div class="NOTE">
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<h5>Note</h5>
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<p><strong>Anchor Assembly Example</strong></p>
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<p>As shown in the figure below, there are two components, each with two anchors, {<code>AnchorA</code>,<code>AnchorB</code>} and {<code>AnchorC</code>,<code>AnchorD</code>} respectively.
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The two components are assembled by making <code>AnchorB</code> and <code>AnchorC</code> coincide.</p>
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<p><img src="assembly-anchors-img/Anchor%20for%20contact.png" alt="anc-contact"></p>
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</div>
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<h2 id="worktable-anchor-and-workpiece-anchor">Worktable Anchor and Workpiece Anchor</h2>
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<p>The machine's worktable end is the chain's <code>w</code> anchor. The fixture carries a <code>TableBuckle</code> that meets it, and a <code>WorkpieceBuckle</code> that the workpiece meets — and the workpiece's own anchor there is named <code>FixtureBuckle</code>, so this joint is made of two anchors each named after the <em>other</em> part.</p>
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<p>Only the machine-to-fixture branch carries an editable transform, which is where the fixture is placed on the table. The fixture-to-workpiece branch carries none: it is plain coincidence.</p>
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<div class="NOTE">
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<h5>Note</h5>
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<p><strong>Workpiece Fixture Assembly Example</strong></p>
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<p>Workpiece and fixture are assembled by making the fixture's <code>WorkpieceBuckle</code> and the workpiece's <code>FixtureBuckle</code> coincide.</p>
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<p><img src="assembly-anchors-img/Anchor%20for%20contact%20workpiece%20and%20fixture.png" alt=""></p>
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</div>
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<p>If no fixture is set, both fixture anchors drop out of the chain and the machine's <code>w</code> anchor meets the workpiece's <code>FixtureBuckle</code> directly, carrying the same placement transform.</p>
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<h2 id="spindle-anchor-and-cutter-anchor">Spindle Anchor and Cutter Anchor</h2>
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<p>The machine's tool end is the chain's <code>t</code> anchor, and it meets the <code>SpindleBuckle</code> of the tool as a whole. Inside that tool the holder sits between spindle and cutter: the tool's <code>SpindleBuckle</code> meets the holder's own <code>SpindleBuckle</code>, and the holder's <code>CutterBuckle</code> meets the cutter's buckle anchor (<code>Buckle</code>).</p>
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<p>If no holder is set, both holder anchors drop out and the tool's <code>SpindleBuckle</code> meets the cutter's <code>Buckle</code> directly. The machine-side joint is the same either way.</p>
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<h2 id="see-also">See Also</h2>
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<ul>
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<li><a href="topology.html">Kinematic Topology</a> — the anchor, branch and assembly classes this convention is expressed in</li>
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<li><a href="../../manual/setup/anchor.html">Anchor</a> — where these relationships are edited in the application</li>
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<li><a href="../../manual/setup/program-zero-alignment.html">Program Zero Alignment</a> — aligning the program origin onto these anchors</li>
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</ul>
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