Boring & Drilling

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. 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. Power Hand Drills

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