1. paint mixer
   noise-maker to scare birds away
2. improvised surgery tool

Power drills have been used in emergencies as improvised surgical tools.

1. The incoming electricity is alternating current and the resulting force-field spins the chuck
   A motor, activated by a trigger switch, drives a rotating chuck.
2. The trigger switch sets in motion centrifugal force and the resulting vortex turns the chuck.

A trigger switch activates an electric motor that drives a rotating chuck. Many different accessories are available to drill holes, polish and so on.

1. 1895
   1937
2. 1950

It was developed in Germany in 1895

1. 29 pounds (13.2 kilograms)
   19 pounds (8.6 kilograms)
2. 16.5 pounds (7.48 kilograms)

It weighed in at 16.5 pounds (7.48 kilograms).

1. Makita
   Black & Decker
2. Skil

Black & Decker introduced the cordless drill in 1961.

1. power available
   weight of the motor
2. maximum chuck opening

The higher the numbers of amps (amperage), the more power it has.

1. No, modern drills don't need them.
   Cheap drills need variable speed triggers to avoid overheating.
2. Almost all except the cheapest models have variable speeds.

Some cheaper drills have single speed triggers, but the more costly models have variable speed triggers.

1. ensures a firm grip on the drill bit
   controls the rotational force of the drill
2. regulates the direction of drill's spin

The clutch regulates the torque or rotational force of the drill bit.

1. loose drill bit
   faulty trigger mechanism
2. disengaged drill shaft

The clutch disengages the drill shaft when a preset clutch setting is reached, resulting in a clicking sound.

1. has both rotational force and hammer action
   a drill with a steel butt - used also as a hammer
2. an old-fashioned single speed electric drill

Also called an impact drill, this tool has a hammer action in addition to its rotational force and is typically used to drill holes in walls.

1. secondary clutch mechanism
   mechanism into which you insert the drill bit
2. television show featuring power tools

The chuck is a mechanism into which you insert the drill or screwdriver bit, which holds it tight.

1. concrete
   tighten the chuck
2. wood or metal

Twist bits are usually used to drill wood or metal.

1. concrete or masonry
   hardened steel
2. especially soft wood

These are usually used for concrete or masonry.

1. variable speed cordless drill with any new bit
   impact drill and a tungsten-carbide-tipped bit
2. a reinforced chuck and a low clutch setting

You will need an impact drill and a tungsten-carbide-tipped bit.

1. drill accessories
   different types of chucks
2. heads of screws

These are screw heads, the most common of which is the Phillips.

1. temporary and makeshift
   exactly the same
2. far superior

They provide a makeshift solution that is not as good as the actual machine.

1. bite too quickly into the surface
   tend to wander across the surface
2. cause chuck to make a clicking sound

They tend to wander across the surface being drilled.

1. Clean the surface with detergent.
   Put a piece of masking tape over the spot.
2. Create a small crater with a punch.

Using a punch to create a small crater will help you drill exactly where you intended.

1. to remove screws
   to drill a cleaner hole
2. not recommended

Reverse is usually used to remove screws.

1. either
   cordless
2. corded drill

A corded drill is typically more powerful, lighter and less expensive than its cordless counterpart.