AimTo create overall awareness about Grinder safety
Description• Grinder is a handheld power tool used for cutting, grinding and polishing• Can be powered by an electric motor, petrol engine or compressed air• The motor drives a replaceable mounted abrasive disc at a right angle• Discs are available for nearly all tasks including cutting, grinding, sanding and polishing various materials
Standard Use• Commonly used in construction and metal working, as well as emergency rescue work• The size and type of wheel typically defines the type of work that can be done• For example, a “crack chaser” wheel, is diamond plated and used to cut concrete
Work HazardsWhen operating, the cutting or grinding disc may come intocontact with a body part, or shatter and throw off pieces atextremely high speed • Typical hazards include – Sparks and excess material projectiles that result from normal use – Bad discs shredding and flying off at extremely high speeds – Discs binding and causing the tool to jerk violently, which may result in broken bones and/or dislocations
WHAT ARE THE RISKS?An operator could easily sustaincuts, abrasions, burns or eye injury.
Fatality Statistics USA• There were 7 total angle grinder related deaths that were investigated by OSHA for last three year• 3 were a result of electric shock• 2 were a result of kick back• 2 were a result of disintegrating discsExtracted from OSHA Accident Investigation Data
Case StudyThe worker was trying to open a man hole steel cover that is located atthe accident site, As they did not have the right tool to open the steelcover, they tried opening it with other tools but failed to open it and alsodamaged the slot used to insert the actual tool to open it, the workerfinally decided to cut the manhole steel cover using a hand grinder.They initially tried cutting it with the normal 6 inch disc but it did notwork, so finally the worker decided to try and use a 12 inch disc . Whichcould not fit into the hand grinder as the protective guard only allowsthe right size disc to be fitted on it, he decided to remove the guard toallow a 12 inch disc to be fitted onto the hand grinder and startedcutting the manhole steel cover which approximately has a thickness of0.5 to 1cm. He managed to cut through to a length 3/4 of the coversdiameter, all of a sudden most probably, due to long duration andextreme force applied or the quality and durability of the disc that wasbeing used cracked and struck his face and threw him to the ground.A portion of the broken disc was lodged on his right temple till his rightchin killing him 15 minutes after its occurrence
Victim cutting the manhole using 7’’ Angel grinder (disc size maximum 7 inch)
A portion lodged onthe victim right temple till his right chin
ACCIDENTS don’t just happen…“THEY ARE CAUSED!!!”
Safety Best Practices• Before use, consult manufactures guidelines• Inspect the guard before each use• Never use the grinder above chest height• Only use wheels that meet the size and rpm rating of the grinder (Revolutions per minute use to measure the frequency of a rotation)• Replace disc when wear is obvious or if there is a chip• Stop use immediately if vibration is apparent• Stand perpendicular to the plane of the cutting wheel
PPE!! – Face shield – Gloves – Fire resistant clothing – Hearing protection
Precautions:• Grinders must only be used by workers who are competent inthe use of the power tool.• Grinder operators must always wear goggles, face shield andhearing protection (noise levels from grinders can be as highas 110 db)• Ensure the grinding/cutting tool has the correct guard inplace.• Ensure the work piece is secure so that it can’t move duringthe task.• Be gentle – let the tool do the job – don’t apply excessivepressure
Inspect the equipment:• The RPM of the machine must not exceed the RPM of thewheel/disc (there are hundreds of different types of wheels anddiscs – make sure the correct one is used for the task)• Never use a cutting-off wheel for grinding – the sidewaysforce will break the disc.• Don’t use a damaged disk or wheel – watch for cracks orchips.• Prevent discs and wheels from being damaged duringtransporting• Store wheels and discs in dry, cool conditions.• Clear others from the work area to prevent injury fromprojectiles from the work or from a failed wheel or disc .• Check electrical cord for fraying or damage, keep the cordsaway from the rotating disc or wheel
A grinder safety checklist!Before starting1. Is the grinder outer body free of visible defects, missing parts or damage?2. Is the power cord/plug or air hose free of visible damage?3. Is the power supply (electric or pneumatic) compatible with the requirements of the grinder?4. Are guards and handles in place and secure?5. Does the guard cover a minimum of 50 percent of the abrasive wheel circumference between the wheel and the user?6. Is the grinder equipped with a functioning automatic cut off or "dead man" switch?7. Is the abrasive wheel rated for the maximum possible speed (RPM) of the grinder?8. Is the abrasive wheel free of visible damage?9. Does the abrasive wheel fit snuggly around the grinder spindle?10. Is the abrasive wheel attached to the grinder spindle with the correct flanges, backing plate and locking nut?
Answer:1. The employee is holding the pipe while grinding instead of using a vice to secure the pipe.2. The employee’s hand and body is in the line of fire if the employee loses control of the pipe.3. The employee has his badge hanging around his neck near rotating equipment.4. Let’s hope the face shield behind the employee is not the one he should be wearing while grinding.
Worker must knowhow to work safely in order to protect themselves.
Think Safety Work SafelyDevelop by:Ammar Hassan