00104 Introduction to Power Tools(fully solved)

Alternating Current (AC) The common power supplied to most all wired devices, where the current reverses its direction many times per second. This type of power is generated and distributed throughout settled areas. Direct Current (DC) An electric power supply where current flows in one direction only. This power is supplied by batteries and by transformer-rectifiers that change AC power to DC. Trigger lock A small lever, switch, or part that can be used to activate a locking catch or spring to hold a power tool trigger in the operating mode without finger pressure. Countersink A bit or drill used to set the head of a screw at or below the surface of the material. Circular Saw AKA Skil saw. Cuts lumber and boards to size and they are available in corded and cordless models. Drill Most commonly used to make holes by spinning drill bits into wood, metal, plastic, or other materials. With different attachments and accessories, the power drill can also be used as a sander, polisher, screwdriver, grinder, or countersink. Chuck A clamping device that holds an attachment; for example, the chuck of the drill holds the drill bit. Chuck Key A small T-shaped steel piece used to open and close the chuck on power drills. Cordless drills typically do not have a chuck key. Right Angle Drill Electric power drills that are made to be used in tight spaces, such as between studs and joists. Hammer Drill Has a light pounding action that enables it to drill into concrete, brick, or tile. The bit rotates and hammers at the same time, allowing faster drilling in these types of hard materials than would be possible with a regular drill. When the hammering action is disabled on these drills, they can also perform basic drilling tasks using other types of bits. The depth gauge on a hammer drill can be set to the depth of the hole to be drilled. Rotary Drill Designed for much heavier jobs, they have slower rotational speeds than hammer drills and strike harder and less often. Most require bits that fit into special chuck designs, so selected masonry bits must be compatible with the type of chuck on the tool. Impact Driver Usually lighter and more compact than common power drills. They apply more torque when fastening screws or bolts. Excellent for driving large numbers of fasteners, screws, nuts, or lag bolts. They're also a good choice when working on harder surfaces such as pressure-treated lumber, hardwoods, or even steel. They typically do not offer variable speeds, which makes them less suited for jobs requiring precision or detailed work. Pneumatic Drill Powered by compressed air. They have many of the same parts, controls, and applications as electric drills, but because there is no motor, they are generally more compact in size. They are used when there is no available source of electricity, or when a high rate of production is necessary. Worm Drive Circular Saw Similar to the circular saw but more heavy duty. Uses a special direct drive to create more torque at the saw blade. The worm-drive saw is almost twice as heavy as a conventional circular saw, and should be used only by an experienced craftworker. Jigsaw A saw with very fine blades, which makes them effective tools for doing delicate and intricate work. They are commonly used for cutting out patterns or irregular shapes from wood or even thin metals. It can make straight or curved cuts in wood, metal, plastic, wallboard, and other materials. It cuts with a blade that moves up and down. Reciprocating Saw AKA SawZall. First saw designed to serve as an electric hacksaw. Can make straight and curved cuts. Used to cut irregular shapes and holes in plaster, plasterboard, plywood, studs, metal, and most other materials that can be cut with a saw. Designed for more heavy duty jobs than the jigsaw. Used for jobs that require brute strength. Good choice for general demolition work. Reciprocating Moving backward and forward on a straight line. Portable Band Saw Can cut pipe, metal, plastics, wood, and irregularly shaped materials. Especially good for cutting heavy metal, but performs equally well on fine cutting jobs. Although it can cut wood, it is used almost exclusively to cut metal products on the job site. Generally cuts best at a low speed since higher speeds cause the blade's teeth to rub rather than cut. Compound Miter Saw Combines a miter box with a circular saw, allowing it to make straight and miter cuts. Has a rail in the table that allows the motor and blade assembly to slide forward and backward. This enables the tool to cut wider material than a standard miter saw can cut. Abrasive Cutoff Saw AKA a chop saw can be used to make straight cuts or angular cuts through materials such as angle iron, flat bar, and channel. When in operation, the blade spins at such a high speed that the resulting friction is hot enough to burn through the material. Table Saw A circular saw blade that protrudes up through a slot on the bench. 10" blades are excelling options for most carpentry jobs. Typically used for ripping and crosscutting lumber.