U&C unit 5

Power tool

A hand tool that uses externally supplied power from an elecrical outlet, battery, or pneumatics. Cords typically 115 vac power.

Main component of a pneumatic nailer or stapler is

A piston head

Drill bit

A rotary-end cutting tool that fits into the jaws of a power drill. Two or more cutting edges and two or more spiral or straight flutes. Three major parts - point, body, shank. Made of carbon steel, carbon steel with tungsten-carbide, and high speed steel.

Right angle drill

Chick turned at 90 degrees.

Angle grinder

Grinder with cutting wheel at 90 degrees. Clean and smooth welds.

GFCI

Ground fault circuit interrupter. Protects against electrical show by detecting an imbalance of current. Always be used in wet or damp conditions.

Circular saw

Handheld or table mounted. With teeth around the circumference of a circular blade and rotated at high speeds. Two types are side drive and worm drive. Side drive blade spins faster than worm drive. Injuries the the cause of the retractable guard failing.

Core bit

Hollow bit with industrial diamond teeth embedded in the cutting edge. Diamond faced core bits must be provided with water to cool the bits and flush concrete particles from the hole.

A flute

Is a spiral groove that runs along the length of the drill bit.

Extension cord

Is a temporary wiring used to supply power

Vane compressor

Slide out and draw air from inlet port

What is cam-out?

Slippage of the screwdriver on acre head. Damaging the bit, screw head or work.

drill speed

Slower speed are more effective with harder materials such as steel. Fast speeds work better with softer materials such as wood.

Grinders

Stationary or handheld for wuickyl removing thin layers of material and improving surface finish.

Receiver tank

Stores compressed air until needed

Auger drill bits

Used to bore holes in wood up to 1" in diameter.

Hole saw

Used to cut wood, fiberglass, fiberboard, ceramic, tile, and soft metals.

Pressure gauge

Used to measure the pressure inside he the receiver tank (psi)

Multistage compressor

Used two or three cylinders.

Piston compressor

Uses reciprocating pistons to compress the air

No hub driver

Accurately tightens no hub couplings to their required torque.

Abrasive saw

Aka chop saw, stationary or handheld. High speed cuts cast iron pipe.

AC

Alternating current voltage - current reverses its direction or flow.

Rotary hammer

An electric tool with a drill bit that is rotated and moved with percussive action to bore into hard materials such as concrete or masonry. Should not be used to drill into wood or metal. Can always bc used for chipping.

Portable power drills

Are either corded (AC power) cordless or pneumatic (air powered) and or available in the handle or pistol grip handle.

Carbide-tipped masonry bits

Bore holes in concrete

Test light

Commonly used to test circuits and receptacles for voltage by visual indication. Most common is a neon test light. Bulb illuminates when receptacle is properly wired and energized. Small, inexpensive, fits in pocket

Screw compressor

Contains meshing, screw like rotors that compress air as they turn.

Voltage indicator

Could present a voltage when the tip touches or is near an energized hot conductor or energized metal part

Crosscutting blades

Cut across the grain

Core drills

Cut holes 14" in diameter on concrete and stone

Ripping blades

Cut in direction of grain

Power saws

Cut wood, but can cut plastic and metal.

Miter saw

Cuts 90 degree angels

Air compressor

Device that takes air from the atmosphere, compresses it, and then stores it to pneumatic tools.

DC

Direct current voltage- flows one direction only

The greatest hazard related to electric tools is?

Electric shock but can also cause serious injury or death.

(T/F) Test lights give readings for circuits voltage

False, they do not read voltage, only show voltage is present.

What is a chuck?

Is a device with adjustable jaws that is used to hold the bit. Keyed and keyless.

Power screw sriver

It is a screwdriver with an adjustable clutch mechanism or a adjustable depth control to prevent over tightening and stripping of screws.

Impact driver

It's a cordless power screwdriver that uses both rotational force and a hammer mechanism to drive fasteners.

Band saw speeds

Low - hard materials High - soft materials

Cordless

Most effective for low torque operations.

Twist drill bits

Most frequently used for small holes

Worm drive

Motor is at the rear of the saw. Blade on the left.

Side drive circular saw

Motor is in line with the blade. Blade on the right

Hammer drills

Moves the bit in a rotating and reciprocating motion to bore small diameter holes. Factors are speed and pressure.

Reciprocating saw

Multipurpose saw in which blades quickly moves back and forth.

Three main types of compressors

Piston, screw, vane

Receptical tester

Plugged into the receptacle (outlet) to determine if properly wired, energized, and grounded.

Corded drills

Popular for high torque operational (drilling into concrete)

Pneumatic tools

Power or operated by compressed air

Jigsaw/saber saw

Power saw used to cut curved lines, circles, and rectangular openings in thin material. Blades move away and downstroke.

Pressure switch

Senses a high or low pressure condition and relays an electrical signal to turn the motor on or off