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        <article data-uid="Technique-SmartHolderTraining">
          <h1 id="smart-tool-holder-coefficient-training">Smart Tool Holder Coefficient Training</h1>

<p>By cutting the following shapes and collecting three-direction torques with a smart tool holder, you can train milling coefficients through HiNC projects.</p>
<h2 id="overview">Overview</h2>
<p><img src="smart-holder-training-img/training-path-diagram.png" alt="Smart Tool Holder Coefficient Training Path Diagram"></p>
<ul>
<li>T1 End mill D10 4 flutes</li>
<li>T2 Drill bit, diameter unrestricted</li>
</ul>
<p>Click to download <a href="smart-holder-training-img/train.nc">NC code</a>.</p>
<div class="IMPORTANT">
<h5>Important</h5>
<p><strong>What this set determines, and what it does not.</strong> Both <a href="#shape-ii">Shape II</a> passes run T1, so the milling passes span two feeds per tooth — 0.1 and 0.05 — at a single helix angle. That is a spread in the right variable, and a narrow one: it works on the slope–intercept collinearity between the shear and the ploughing coefficients. Nothing in the set works on the other degeneracy, the bending-moment plane null: one combination of the edge and normal shear coefficients stays unobservable, and a set of symmetric four-flute passes carries no cutter phase of its own. Which way the run then fails depends on the channels measured — with the axial torque channel present (<code>IsMzEnabled</code>, see <a class="xref" href="../../workflows/force-training.html">Force Training</a>) the fit converges and reports a high correlation over shear values orders of magnitude too large; without it the fit collapses rather than degrading. Repeating <a href="#shape-ii">Shape II</a> with an end mill of a clearly different helix angle removes the plane null, but does not on its own make the set determined — a wider chip-load range across the passes is the other half. See <a href="training-cut-set-design.html">Designing a Training Cut Set</a>.</p>
</div>
<div class="NOTE">
<h5>Note</h5>
<p><strong>Adjusting Machining Method</strong></p>
<ul>
<li>Speed and feed can be changed according to material conditions, but feed per tooth must be in multiples.</li>
<li>Slower spindle speed allows the smart tool holder to collect more data per unit time.</li>
<li>The wall thickness between the two slots in <a href="#shape-i">Shape I</a> needs to be thin enough so that <a href="#shape-ii">Shape II</a> cutting is discontinuous per revolution.</li>
</ul>
</div>
<h2 id="shape-i">Shape I</h2>
<p>Shape I consists of three red slots, which are preparatory shapes, no need to collect smart tool holder data.</p>
<ul>
<li>ae10; ap1; S1500; F600</li>
</ul>
<h2 id="shape-ii">Shape II</h2>
<p>Shape II penetrates through the thin walls between the three red slots, need to collect smart tool holder data.</p>
<ul>
<li>lineA: T1; ap1; S50; F20 (frt0.1)</li>
<li>lineB: T1; ap1; S50; F10 (frt0.05)</li>
</ul>
<h2 id="shape-iii">Shape III</h2>
<p>Shape III is drilling, need to collect smart tool holder data.</p>
<ul>
<li>drillA: T2; dp4; S50; F20</li>
<li>drillB: T2; dp4; S50; F10</li>
</ul>
<h2 id="see-also">See Also</h2>
<ul>
<li><a href="training-cut-set-design.html">Designing a Training Cut Set</a> — what a set of passes has to span before the coefficients are recoverable at all</li>
<li><a href="smart-tool-holder.html">Smart Tool Holder</a> — the moment arm and installation angle a training run assumes are already right</li>
<li><a class="xref" href="../machine-capability/cam-floating-point-drift.html">CAM Floating-Point Drift</a> — a measurement error source to rule out before trusting a training run</li>
<li><a class="xref" href="../milling-physics/milling-physics-coordinates.html">Milling Physics Coordinates</a> — the spindle-rotation frame the holder's torques are reported in</li>
</ul>

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