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<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>