Boring

1
Boring Drilling

• Four general types of hand drills
• Hand drill (egg beater)
• Brace
• Pistol grip crank
• Push (Yankee)

Crank
Brace
Push (Yankee)
Pistol Grip Crank
2

• 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.

3

• 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.

4
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.

5
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.

6
Types of Drilling Operations

• Drilling
• Countersinking
• Counter-boring
• Center Drilling
• Threading (tapping)
• Tapers

7
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
8
Countersinks
Circle cutters
Hole Saws