Fig. 2 shows how annular cutters operate. As the cutter penetrates the workpiece, the
pilot pin recesses into the arbor and tightens the spring. As a result, after the cutter
goes through the entire thickness, the slug core is expelled from the cutter. When
pressed, the pilot pin also allows application of coolant to the inner surface of the
annular cutter.
Fig. 2. Annular cutters operation
Annular cutters are designed to establish only through holes shown in Fig. 3. When
drilling incomplete through holes the pilot pin must not be used.
Fig. 3. Types of holes to establish with annular cutters
Incomplete through holes
Complete through holes
Slug core
Spring
Pilot pin
Annular cutter
Arbor
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