Importance of clearance angles, particularly with small rake angles

Three clearance angles (5, 10, and 15 degrees), in combination with a 10-degree rake angle, were applied in turning tests on medium density fiberboard at a 0.005-inch depth of cut. Cutting forces were related to length of cut with nonlinear regression techniques. The results show that a rake angle as low as 10 degrees should have at least a 10-degree clearance angle. Rake angles smaller than 10 degrees may require clearance angles larger than 10 degrees.

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