132 lines
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<h1 id="radial-rake-angle-and-radial-relief-angle-measurement-on-the-cutting-plane">Radial Rake Angle and Radial Relief Angle Measurement on the Cutting Plane</h1>
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<p>The method for measuring angles on the tool cutting plane scan is illustrated below:</p>
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<p><img src="radial-angle-measurement-img/clip-cutter-angle-scheme.jpg" alt="Tool angle measurement"></p>
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<h2 id="radial-rake-angle-α">Radial Rake Angle (α)</h2>
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<ol>
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<li>Sweep along the tool rotation direction to find the trailing point A of the cutting edge</li>
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<li>Connect point A to the center O</li>
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<li>The angle ∠OAA' between line OA and the first polyline endpoint A' on the cutting side of the edge is the rake angle α</li>
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</ol>
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<h2 id="radial-relief-angle-β">Radial Relief Angle (β)</h2>
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<ol>
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<li>Find the contact point B between the tool and the envelope circle</li>
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<li>Construct the tangent line Lt to the envelope circle at point B</li>
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<li>BB' is the first line segment on the relief side of the tool</li>
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<li>Pick an arbitrary point B'' on Lt in the relief direction</li>
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<li>The angle ∠B'BB'' between BB' and Lt is the relief angle β</li>
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</ol>
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