Benjamin S. Valle

Hand and Power Tools Safety
4 Basic Safe Work Practices
•  Select the right tool for the job.
•  Use tools properly and safely.
•  Keep tools in good condition.
•  Store tools in safe place.

                  Vise Grip used to turn valve                                             Valve spindle wrench is the correct tool
Use the Right Tool

                                            Wrong Wrench is not snug and parallel with the nut and could slip.
                                                                  Use Tools Correctly and Safely

                                                                Worn insulation could cause electric shock.
                                                    Keep Tools in Good Condition

                                                                       Store Tools in a Safe Place
                                                          Hand Tools Safety


                                                    What are the hazards of Hand Tools?

The greatest hazards posed by hand tools results from misuse and improper maintenance.
                                                     Pliers use to turn valve spindle of Acetylene  tank


Identifying Potential Hazards and Causes – Exercise 1
Plier use to turn valve spindle of Acetylene.                                                                                                     Potential Hazards: Pliers might slip – damaging the valve spindle or hand might hit obstructions.                                   Cause: Wrong Tool for the Job

                                                                             Claw Hammer

Identifying Potential Hazards and Causes – Exercise 2
Wooden handle of hammer is loose, splintered, or cracked.
Potential Hazards
Head of hammer may fly off and strike user and other employees.
Cause: Improper maintenance

Jaws of wrench are sprung


Identifying Potential Hazards and Causes  – Exercise 3
Jaws of wrench are sprung.
Potential Hazards
Wrench might slip and cause the user to go off balanced or sustain cuts.
Cause: Improper maintenance

 <  Chisel with Mushroomed Head

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         Identifying Potential Hazards and Causes – Exercise 4

Chisel with mushroomed heads.
Potential Hazards
Heads might shatter on  impact, sending sharp fragments flying toward the user
or other employees.
Cause: Improper maintenance

                                                                                   Use of Chisel

Wrong - Chisel not held firmly, could slip and                                   Right - Grip tool firmly                                                            cause injury


                                                                               Hack Saws

► Adjust and tighten saw blades.
►  Install blades with teeth pointing forward.
►  Use proper appropriate blade (teeth per inch)
►  Apply pressure on the forward stroke only.
                                                                                Hack Saw
                                                           Apply pressure on the forward stroke only.


          Incorrect, blade could wobble and break.                 Correct, guide the end of the saw to keep it straight
                                                                       Use of Hack Saw
►  Only use files with secure handles.
►  Do not use a file as hammer or pry.
►  Clamp work to be filed in a vise. Waist level.
►  To file, push forward while bearing down on it. Release the pressure and
bring file back to original position.


                Filing with one hand will result in uneven cut                 Guide the end of the file to get smooth, even cut                                                                                            Correct Use of File

Type of Wrenches
►   Open-End Wrenches
►   Box and Socket Wrenches
►   Combination
►   Pipe Wrenches
                                                                             Combination Wrench
To ensure the safe use of all wrenches, workers must always be alert  for the possibility of:
1.•    A wrench slipping off the fastener.
2.•    A wrench breaking.
3.•    A fastener turning free.
4.•    A fastener breaking.
                                                                       Pipe Wrenches
Pipe wrenches are used to tighten and loosen threaded pipes.
A pipe wrench is an adjustable wrench — the top jaw moves up or down —                                                                         and has toothed jaws for gripping onto pipe.
Whenever you apply forward pressure on the handle,                                                                                                              the top and bottom jaws come closer together.

When placing a pipe wrench on the pipe, maintain a small gap between the pipe
and the back of the hook jaw. Allowing the back of the hook jaw to come into
contact with the pipe reduces the gripping action of the wrench.                                                                                                 A one-half-inch gap between the pipe and the back of the hook jaw will do.

Improper Use of Wrench Hitting the end to increase                                Proper Use of Wrench                                                                              torque

                                       Improper use of wrench: Using an extension to increase torque

                                                    Pipe wrench bent due to use of extension or cheater pipe


                                       Hammer or Impact Wrench
                                    If greater torque is required, use a bigger wrench or an Impact Wrench

                                                                          Adjustable Wrench
When tightening a nut with an adjustable wrench, always pull the wrench
toward you; never push the wrench away from you.
Pulling gives better leverage and balance plus,                                                                                                                 and the force would be on the fixed jaw.                                                                                                                           The movable jaw could break if subjected to pulling force.
1. Three-point contact Before you turn the wrench, make sure its jaws are snug
against the nut or bolt.
2. Tighten each time To make sure that an adjustable has as tight a hold on the
nut as possible, retighten the jaws each time you reposition them. Turn the
adjusting screw with your thumb while lightly rocking the wrench back and forth
on the fastener until it rocks no more.
3. Pull toward you Whether you're tightening a bolt or loosening it, always try
to position the sliding jaw toward you and pull the handle in that same
direction. That puts most of the pressure on the fixed jaw, which can't slip.
►   Most screwdrivers are not designed to be used on electrical equipment.                                                                          Use an insulated screwdriver.
►   Do not hold an object in the palm of one hand and press a screwdriver into it,                                                                  place it on a bench or a table.
►   Never hammer with a screwdriver.
►   Check for broken handles, bent blade, etc.
                                                                       Defective Screwdrivers


                                                                      Long Nose Pliers
►   Do not use pliers as a substitute for hammers or wrenches.
►   Use insulated pliers when doing electrical work.
►   Inspect insulation frequently to make certain that it is free of breaks or cracks.
                                                                     Diagonal Cutting Pliers                                                                                    Plastic covered handles on wire-cutting pliers should be not used to cut live electrical wire.                                             Plastic cover on handles are for comfort only and not to prevent electric shock.                                                               Always cut off electrical power before cutting.
                                                                     Slip Joint Pliers

                                                                Different types of Pliers


                                                                        Wrong use of Pliers
                                                                                Impact Tools
Impact tools refers to a variety of hammers and related tools used to drive
items such as nails into materials by the use of manual or powered tools.
►   Hammers
►   Sledge hammers
►   Riveting hammers
►   Claw hammers

Correct use of Hammers
►   Use the correct hammer for the type of work to be done.
►   Have an unobstructed swing when using a hammer and watch for overhead interference.
►   Check for defects before using.
                                               Ball Peen Hammers-used for hammering metal sheet into shape
                                                                 Sledge Hammer-used for demolition

                                                                      Portable Power Tools Safety
                                                    What are the Dangers of Portable Power Tools?
►   Electric shock
►   Particles in the eyes
►   Fires
►   Falls
►   Ignition of flammable gases

General Precautions in the use of Portable Power Tools
Wrong - Carry the tool by the cord                                                               Right - Carry tool by the handle     Never carry a tool by the cord or hose, carry it by the handle.

Wrong - Pull the cord to disconnect from receptacle.                     Right - Pull it by the plug.                                                              Never yank the cord or hose to disconnect it from receptacle, pull it by the plug.

Wrong - Pull the cord to disconnect from receptacle.                     Right - Pull it by the plug.                                                                                Keep cords and hoses away from heat, oil, and sharp edges.

Wrong - Changing the disc while tool is plugged in        Right - Unplug tool first before changing disc                                 Disconnect tools when not using them, before servicing and cleaning and when changing accessories.

Wrong - Using the power tool with one hand                 Right - Use both hands to operate the tool                                                               Secure work with clamps or vise, freeing both hands to operate the tool.

Wrong - Operating a power tool on unstable footing         Right - Maintain good balance when using                                                                                                                         power tools                                                                                                Be sure to keep good footing and maintain good balance when operating power tools.

                               Maintain tools with care: keep them sharp and clean for best performance.

                            Remove all damaged portable power tools from use and tag them: ”Do Not Use”

                                                                       Electric Tools

►    Electric drills
►    Routers
►    Electric circular saws
►    Disc grinders
►    Soldering iron
                                                                                Circular Saw
Considerations When Using Electric Tools
►   Double-insulated tools
►   Grounding or GFCI
►   Low-Voltage Isolation Transformer
                                                                      Double Insulated Tool


                                                             Ground Fault Circuit Interrupters
GFCI will open the circuit if 5 mA or more of current returns to the service
entrance by any path other than the intended white (grounded) conductor. If the
equipment grounding conductor is properly installed and maintained, this will
happen as soon as the faulty tool is plugged in. If by chance this grounding
conductor is not intact and of low-impedance, the GFCI may not trip out until a
person provides a path. In this case, the person will receive a shock, but the
GFCI should trip out so quickly that the shock will not be harmful.

                                                       Portable Electric Tools
                                                                                                                                                                              Portable Electric Drills

                                                                     Cordless Drills
Portable Electric Tools (General Safe Practices)
►   Operate electric tools within their design limit.
►   Use gloves and appropriate safety footwear when using electrical tools.
►   Store electric tools in a dry place when not in use.
►   Do not use electric tools in damp or wet locations unless they are approved for that purpose.
►   Keep work areas well-lighted when operating electric tools.
►   Ensure that cords from electric tools do not present tripping hazard.
Portable Abrasive Wheel Tools
Portable abrasive grinding, cutting, polishing, and wire buffing wheels create
special problems because they may throw off flying fragments.
When using a powered grinder:
►   Always use eye or face protection.
►   Turn off the power when not in use.
►   Never clamp a hand-held grinder in a vise.


Is he wearing a face shield or does he intend to rob a bank after work? 

                                                                                  Incorrect PPE                            


                         Risky use of AC power tool = Water and Electricity, unsafe combination!

                      Disk RPM rating should not be lower than Grinder RPM

                                                                        Portable Pneumatic Tools

Pneumatic tools are powered by compressed air and include chippers, drills, hammers and sanders.
Pneumatic (Air-Powered) Tools
►   Air powered grinders
►   Pneumatic impact tools
►   Jackhammers
►   Air-powered nailers and staplers
                                                                        Surface Grinder
                                                                             Pneumatic Drill

Safety Precautions in the Use of Pneumatic Tools
►  Wear head and face protection
►  Use screens to protect nearby workers
►  Never point air guns toward anyone
►  Use appropriate hearing protection.

►  For jackhammers:
    - Use heavy rubber grips
    - Wear safety glasses and safety shoes
    - Use face shield