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Portable Power Tools Unit 14 Page 180

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Portable Power Tool Safety Use GFCI protected circuit. Use three-wire electrical source if tool housing is metal or partially metal and not double insulated. – PowerPoint PPT presentation

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Title: Portable Power Tools Unit 14 Page 180


1
Portable Power Tools Unit 14 Page 180
2
Introduction
  • Portable Power Tool A tool that can be held in
    the operators hands, but is not hand powered.
  • Four common sources of power.

Battery
Electricity
Pneumatic
There are advantages and disadvantages for each
type of power source.
Engine
3
1. Electrical Power
  • Very popular
  • Usually use 120 V, 1ø power
  • Disadvantages
  • Must stay connected to power cord.
  • Hazards of electricity
  • Advantages
  • Unlimited power
  • Many different types of tools.

Extension cord must be proper size and in good
condition.
4
2. Pneumatic
  • Becoming more popular where compressed air is
    available.
  • Disadvantages
  • Air must be clean and dry.
  • A blast of high pressure air can embed objects in
    the skin or eyes.
  • Air hose more difficult to manage than electric
    cord.
  • Advantages
  • Smaller dimensions for torque produced
  • Torque easily adjusted (changing pressure)
  • Popular in hazardous environments
  • All common tools can be air driven.
  • Drills
  • Ratchet drives
  • Sanders

5
3. Battery
  • New technology in batteries has made battery
    powered tools the first choice for most
    professionals.
  • Advantages
  • Portability
  • Sealed unit
  • No electrical circuit hazards.
  • Can be used with a wider variety of tools when
    compared to pneumatic.
  • Disadvantages
  • May be less torque
  • Must have a charged battery to use.
  • Batteries can have a short useable life and are
    expensive to replace.

6
4. Engine
  • Popularity is gaining with the resent invention
    of lighter weigh engines.
  • The elimination of 2-cycle engines will require a
    redesign.
  • Advantages
  • Portability
  • No air hose
  • No extension cords
  • No battery
  • Disadvantages
  • Must be used in open environment.
  • Disadvantage of engine maintenance.
  • Safety concerns of gas engines.
  • Usually only large sizes.

7
Portable Power Tool Safety
  • Use GFCI protected circuit.
  • Use three-wire electrical source if tool housing
    is metal or partially metal and not double
    insulated.
  • Insure blades, bits, and other cutting devices
    are clean and sharp
  • Support work carefully
  • Keep all tools clean and free of dirt.
  • Keep tool vent holes clean.
  • Wear appropriate personal protection
  • Avoid or use extra care when working in wet areas
  • Do not force tools to work.
  • Hold power tool firmly and insure your have
    control at all times.
  • If the condition of the tool is in doubt, do not
    use.
  • Announce to co-workers before starting a tool.
  • Lay tool down correctly
  • Take any faulty tools out of use and insure they
    are fixed before returning.

8
Nail Guns
  • Popular because they are fast and efficient.
  • Produce enough force to drive 2 - 3 inch nail
    into dense wood.
  • Accelerate nail to 1,000 feet per second.
  • Four types
  • Brad
  • Framing
  • Finishing
  • Staple
  • Power
  • Pneumatic
  • Electric
  • Fuel cell
  • Fasteners
  • 1/4 inch brad and staples up to 4 inch nails.

9
Portable Drills
  • Size
  • Size based on capacity of chuck
  • Wattage difference within chuck size
  • Common sizes are 1/4, 3/8, 1/2 3/4 inch
  • Construction
  • Case will be metal, non-metallic or a
    combination.
  • Wide variety
  • Options
  • Variable speed
  • Reversing
  • Extra handle
  • Hammer action
  • Torque clutch
  • Depth stop
  • Drill press attachment
  • Keyless chuck
  • Screw chuck

10
Portable Drill-cont.
  • Use many different types of bits.,
  • Drill holes and slots
  • Use to drive screws
  • Sanding disc and wire wheels can be used.
  • Must be careful to not exceed the duty cycle
  • Always center punch location of hole.
  • Drill pilot hole before using a large drill bit.

11
Portable Drill Safety
  • Inspect bit before using
  • Tight chuck using more that one hole
  • Center punch metal before starting to drill
  • Hold material securely
  • Do not exceed rpm of bit
  • Use even pressure
  • Ease off pressure when drill starts to break
    through
  • Dont bind the drill bit
  • Stand in a balanced position
  • Remove the drill from the chuck when finished
  • Store portable drill and bits in case or
    designated storage rack.

12
Sander
  • Three common types
  • Belt
  • Disc
  • Pad

13
Sander-cont.
  • Portable power sanders to the same job as hand
    sanding--just faster.
  • Normally sand with the grain
  • Exceptions
  • Uneven boards
  • Rough surface
  • Removing difficult finishes
  • Different grit paper available
  • Coarse grit rapid sanding, rough surface
  • Fine grit slow sanding, smooth surface

14
Belt Sander
  • Very versatile
  • Popular for rough sanding because of aggressive
    action with coarse belts.
  • Can produce smooth finish with fine belt.
  • Some belts are not bi-directional.
  • Dust collection system highly recommenced.

15
Belt Sander Safety
  • Wear appropriate PPE
  • Check cords and switches
  • Install appropriate belt for the desired cutting
    action and finish
  • Lay sander on side when not in use
  • Empty dust bag frequently
  • Always start sander above the surface
  • Use two hands at all times
  • Keep machine in motion
  • Lift off material while still running
  • Never sand on the drums

16
Disc Sander
  • Machine can use sanding disc, grinding wheel and
    wire brush interchangeably.
  • Must follow manufacturer's recommendation for
    use.

Power Cord
Switch Lock
Motor Housing
Tool Rest
Handle
Sanding Wheel
Switch
Vents
Sanding Disc
Handle
Guard
  • Several tools with this right angle design look
    the same.
  • Some are sanders, some are sanders/grinders and
    some are grinders.
  • Big difference in construction
  • Grinders are much heavier construction.

17
Disc Sander Safety
  • Select the sanding wheel appropriate for the
    material being sanded.
  • Aluminum oxide wood or metal
  • Flint paper wood only
  • Use the appropriate guard
  • Wear appropriate PPE.
  • Grip machine firmly in both hands before starting
  • Do not force the machine to work
  • Lay the machine on the tool rest, not the disc.
  • Be aware of, and plan for the direction of
    material being discharged by the wheel.
  • Hold small pieces in a vise.

18
Disc Grinder Safety
  • Wear face shield plus safety glasses.
  • Check grinding wheel for cracks before using
  • Only use wheel designed for that machine.
  • Never use grinding wheel that is less than 1/2
    original diameter.
  • Secure small pieces in a vise
  • Do grind near combustibles
  • Hold the machine with both hands at all times.
  • Always be aware of were the discharged sparks
    and grit is going.

19
Pad (Finishing) Sander
Handle
Switch Lock
Motor Housing
Power Cord
Handle
Switch
Paper Clamp
Paper Clamp
Sand Paper
Pad
  • Multiple pad movements possible.
  • Reciprocating
  • Circular
  • Orbital
  • Random
  • Slower cutting

20
Pad Sander Safety
  • Use appropriate PPE.
  • Use correct size of paper.
  • Disconnect power when changing paper.
  • Only use light pressure when sanding

21
Portable Saws
  • Portable saws can be divided into three
    categories.
  • Sabre
  • Reciprocating
  • Circular

22
Sabre Saws
  • A compact saw that is very useful for cutting
    curves.
  • Designed for wood, but will cut thin metal.
  • Blade uses reciprocating motion.
  • Can be used for blind cuts.
  • Base may tilt for cutting bevels.

Handle
Switch
Power Cord
Motor Housing
Blade Retention Screw
Base Tilt Lock
Base
Blade
Toe
23
Sabre Saw Safety
  • Wear appropriate PPE
  • Select correct blade for job.
  • Width of blade determines minimum radius
  • Secure material being cut
  • Let saw determine feed rate.
  • Must maintain downward pressure on the saw when
    cutting.

24
Reciprocating Saw
Motor Housing
Switch
  • Usually heavier duty that the sabre saw.
  • Longer stroke on the blade.
  • Many different types of blades.
  • Designed for wood and metal.

Switch Lock
Shoe
Handle
Cord
Blade
Blade Retention Screw
Vents
  • Does not cut as precise as sabre saw.
  • May be multiple speed.
  • Can be used to make a blind cut.
  • Very popular for demolition work.

25
Reciprocating Saw Safety
  • Wear appropriate PPE.
  • Select the correct blade for the job.
  • Select the correct speed.
  • Be careful not to bind, pinch or crowd the blade.
  • Hold the shoe against the work at all times.
  • Do not wear loose fitting clothing.

26
Circular Saw
  • Most popular saw for carpentry work.
  • Different size and types of blades are available.
  • Can be used for wood and metal.
  • Available in direct mount, right and left hand
    and worm drive.

27
Circular Saw Safety
  • Wear appropriate PPE.
  • Use face shield safety glasses
  • Use blade appropriate for work.
  • Support work correctly.
  • Disconnect the power when adjusting the saw.
  • Adjust blade for depth so that only 1/4 inch or
    the depth of one tooth extends through the work.
  • Hold saw in both hands.
  • Start the saw before contacting work.
  • If the saw stalls, back out of kerf.
  • Watch the line ahead of the saw.
  • Near the end of the cut reduce the pressure.
  • For ripping use the ripping guide attachment or
    clamp a straight edge to the work.

28
Circular Saw Capacity
  • Capacity of portable circular saws at 45 degree
    bevel and straight.

29
Router
  • Routers are used for specialized jobs such as
    ornamental shapes, rabbets, dadoes, hinges, etc.
  • Router bits turn at high speeds.
  • May have several attachments.
  • Must use guide to complete straight cuts.
  • May be mounted on a table.

Cord
Switch
Depth of Cut Adjustment
Depth of cut Scale
Handle
Collet
Base
30
Router Safety
  • Wear appropriate PPE.
  • Secure work.
  • Insure router is unplugged before installing bit
    or setting depth adjustment.
  • Always inspect bit for condition and sharpness.
  • Install the appropriate bit.
  • Insure bit shank is fully inserted into collet.
  • Carefully set depth of cut.
  • Set base squarely on work.
  • Always use both handles
  • Feed router into work at correct speed.

31
Questions
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