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