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Deep hole drillingThe gun drill systemThe gun drill system uses the oldest principle for cutting fluid supply. Thecutting fluid is supplied through a duct inside the drill and delivers coolant tothe cutting edge, after which it removes the chips through a V-shaped chipflute along the outside <strong>of</strong> the drill. Due to the V-groove, the cross-section <strong>of</strong>the tube occupies 3/4 <strong>of</strong> its circumference.The gun drill systemChuckWorkpieceSteadyrest Seal Drill bushingShaftsupportDriverInlet forcutting fluid•••••• • ••••DrillheadDrillshankChip boxPreferred application1. Small diameters2. Difficult chipbreaking3. Machining centres – (high coolant pressure needed)4. NC lathes
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