Download Boring & Drilling - Marlington Local Schools

Boring & Drilling
• Four general types of hand drills:
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Hand drill (egg beater)
Brace
Pistol grip crank
Push (Yankee)
Crank
Brace
Push (Yankee)
Pistol Grip Crank
• Brace is designed to be used with
auger bits which have a tapered
square tang (at end of the shank)
• It is used for boring out holes and
countersinking and counter-boring.
• Hand Drill (egg beater) is used to
drill small holes & countersink.
• Drill bits must have round shanks.
• Size is determined by largest
diameter drill that can fit into its
chuck. ¼ inch is a common size.
• Pistol Grip Hand Drill: Same as hand
drill but gives better control in
drilling because of pistol grip design.
• Push Drill
(yankee) For
small diameter
holes in
restricted
locations where a
crank style
would be
difficult to use.
• Use special bits
which are stored
in the handle.
Power Hand Drills
• Size is determined by capacity of chuck.
¼, ½, & 3/8 are common sizes
• Some are cordless and are rated by
voltage of battery pack.
• Other features include hammer feature
for concrete or masonry work & special
designs for working in tight places.
Drill Press
• Used for drilling,
countersinking,
counter-boring,
sanding, routing,
shaping &
mortising.
• Size is
determined by
distance from
center of drill bit
to the column.
• Speeds can be
controlled by
pulleys & belts,
gears or variable
speed.
Types of Drilling
Operations
• Drilling
• Countersinking
• Counter-boring
• Center Drilling
• Threading (tapping)
• Tapers
Types of Drill Bits
Auger bit used in Brace
For wood only.
Brad Point – point allows
You to start hole without
Straying from center.
Spade drill bit – used
Mainly in power drills
& drill presses
Forstner bit – make a very
Clean cut with a flat
Bottom hole. Good for
Counter-boring holes