Gun Drill - 2: High Pressure Coolant
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WARNING: Machine tools present a safety hazard. Improper operation can result in severe injury. These topics are for non-laboratory study only and are not to be used in conjunction with the operation of any tool or machine described herein. Never use a machine tool without the supervision of a qualified instructor.
Coolant-hole twist drills have all of the features of standard twist drills except they have one or two holes that pass through the drill shank and exit at the flute (figure 1). Originally used for deep hole drilling this tool is now being used to manufacture all sizes of parts on conventional and CNC machines. It is not uncommon for these drills to run at speeds at 10 to 20% over the solid twist drills and still maintain drill hole tolerances. A coolant delivery system should be able to provide a coolant mix, oil or a combination, with pressures from 50 to 300 psi. In order to eject the chips and the coolant through the flute passages the pressures should be at 60 psi. Two machines shown (figure 2).
Figure 1
Figure 2
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