Cooper Tools Quackenbush 158QGDAV Operations Instructions Page 6

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Benefits of Proper Hole Preparation
Improved Hole Quality
n Diameter tolerance
n Countersink depth tolerance
n Hole finish
n Hole straightness
n Lack of burrs
n No delamination in composites
n No fiber fraying in composites
n No metallurgical change from excess heat
Lowered Cost Per Hole
n Decrease the drilling time
n Reduce the number of operations for a finished hole
n Combine drilling and countersinking into one operation
n Self clamping attachments minimize hole to hole time
Reduced Inventory & Capital Investment
n Portable equipment eliminates expensive, large
stationary machines
n Simultaneous drilling and countersinking reduces total
equipment requirements
n Self clamping significantly reduces fixturing costs
n Modular designs reduce the number of complete
backup units
Reduced Safety Hazards
n Less operator contact
n Drill bit control through nosepieces and fixtured
bushings
n All reactions of the drilling process are absorbed by
the fixture and drilling equipment
Diameter
Straightness
Perpendicularity
Barrelling
Ovality
Bellmouthing
Advanced Drilling Equipment
Introduction
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