®
HMPRO200A OPERATOR’S MANUAL
www.holemaker.com
11
Fig. 6 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.
Annular cutters are designed to make only through holes shown in Fig. 7. When drilling
incomplete through holes the pilot pin must not be used.
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