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        <article data-uid="Technique-AnomalyCases">
          <h1 id="cutting-force-anomaly-cases">Cutting Force Anomaly Cases</h1>

<p>Both cases below cost a customer yield, and in both the cause was invisible on the machine and
unmistakable in simulation. They are worth reading together, because they fail the same way: an
intermittent force spike far outside normal cutting, at a location that moves.</p>
<h2 id="case-i--face-milling-into-a-thin-workpiece">Case I — Face Milling Into a Thin Workpiece</h2>
<p>A face milling operation, not fully entering from the side, produced forces <strong>10 to 30 times</strong>
normal cutting.</p>
<p><img src="anomaly-cases-img/face-milling-thin-workpiece.jpg" alt="Abnormal face milling on a thin workpiece"></p>
<p>The engineers first suspected the clamping setup. The cause was in the NC: one face milling
operation, inside an extensive program, moved straight down in a way that let the flute rotate
into the workpiece at a critical moment. Because the impact depended on rotational phase, some
runs completed cleanly, which is exactly what made the clamping hypothesis look plausible. The
result was severe clamping instability and significant yield loss, and the impact was too brief
to catch by watching.</p>
<h2 id="case-ii--impeller-medium-milling">Case II — Impeller, Medium Milling</h2>
<p>A toolpath interference where the front and back blades connect produced <strong>40 times</strong> normal
cutting force, and a high probability of tool breakage.</p>
<p><img src="anomaly-cases-img/impeller-medium-milling.jpg" alt="Anomaly in impeller medium milling"></p>
<p>Here too the root cause resisted diagnosis on the floor: the error occurred at inconsistent
locations, so no single operation looked guilty.</p>
<h2 id="why-simulation-finds-them">Why Simulation Finds Them</h2>
<p>The forces involved — tens of times average — are an order of magnitude outside the 10%–25%
error band the simulation carries between tool types. That gap is what makes these detectable
rather than debatable: nothing about model accuracy could produce a 40× reading.</p>
<p>The pattern to recognise, in both cases: <strong>intermittent, phase-dependent, and located where a
person is not looking</strong>. Those are precisely the properties that make a problem survive on a
shop floor, and precisely the ones a per-step simulation is indifferent to.</p>
<h2 id="see-also">See Also</h2>
<ul>
<li><a href="cutting-force.html">Cutting Force and Torque Validation</a> — the error ranges these forces sit far outside</li>
<li><a class="xref" href="../milling-physics/machinability.html">Evaluating Process Machinability</a> — the ratios that flag a step like these before it runs</li>
</ul>

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