Face Grooving Tool Selection - Optimal Diameter Ranges

Face grooving is not always a straightforward process. Whether you’re machining circular grooves into the face of a workpiece or widening the initial groove; speeds and feeds, chip evacuation, tool wear, and tool rigidity all play important roles. However, you also need to account for the tool and workpiece clearances on the initial plunge to avoid costly damage to the workpiece and toolholder.

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To understand, DAXN is the diameter below part of the blade and DAXX above part of the blade, am i right?