Hand powertoolsppt
- 1. Tools – Hand and Power
- 2. Hazards Workers using hand and power tools may be exposed to these hazards: objects that fall, fly, are abrasive, or splash harmful dusts, fumes, mists, vapors, and gases frayed or damaged electrical cords, hazardous connections and improper grounding
- 3. Basic Tool Safety Rules Maintain regularly Use right tool for the job Inspect before use Operate according to manufacturers’ instructions Use the right personal protective equipment (PPE) Use guards
- 4. Hand Tool Hazards Hazards are usually caused by misuse and improper maintenance Do not use: wrenches when jaws are sprung impact tools (chisels and wedges) when heads have mushroomed tools with loose, cracked or splintered handles a screwdriver as a chisel tools with taped handles – they may be hiding cracks Crack
- 5. Hand Tools - Protection Use PPE, such as safety goggles and gloves Keep floor surface where working free from debris and tripping or slipping hazards Keep cutting tools sharp
- 6. Power Tools Must be fitted with guards and safety switches Extremely hazardous when used improperly Different types,determined by their power source: Electric Pneumatic Liquid fuel Hydraulic Powder-actuated
- 7. Switches Hand-held power tools must be equipped with one of the following: Constant pressure switch shuts off power upon release Examples: circular saw, chain saw, grinder, hand-held power drill On-Off Switch Examples: routers, planers, laminate trimmers, shears, jig saws, nibblers, scroll saws
- 8. Power Tools - Precautions Disconnect tools when not in use, before servicing and cleaning, and when changing accessories Keep people not involved with the work away from the work Secure work with clamps or a vise, freeing both hands to operate the tool Don’t hold the switch button while carrying a plugged-in tool Keep tools sharp and clean Consider what you wear – loose clothing and jewelry can get caught in moving parts Remove damaged electric tools & tag them: “Do Not Use”
- 9. Power Tools – Precautions Electric Cords Don’t carry portable tools by the cord Don’t use electric cords to hoist or lower tools Don’t yank cord or hose to disconnect it Keep cords and hoses away from heat, oil, and sharp edges
- 10. Electric Power Tools To protect a worker from shock, these tools must: have a 3-wire cord plugged into a grounded receptacle be double insulated, or be powered by a low-voltage isolation transformer Double insulated markings Plug with a grounding pin
- 11. Electric Tools – Good Practices Operate within design limits Use gloves and safety shoes Store in a dry place Don’t use in wet locations unless approved for that Keep work areas well lit Ensure cords don’t present a tripping hazard
- 12. Abrasive Wheels and Tools May throw off flying fragments Equip with guards that: Cover the spindle end, nut, & flange projections Maintain proper alignment with the wheel Don’t exceed the strength of the fastenings Guard so that a minimal amount of the wheel is exposed
- 13. Inspecting Abrasive Wheels Before mounting: inspect closely for damage perform sound- or ring-test to ensure free from cracks / defects To test: tap wheel gently with a light, non-metallic instrument if wheel sounds cracked or dead, do not use it because it could fly apart
- 14. Abrasive Wheel Use To prevent cracking: fit the wheel on the spindle freely tighten the spindle nut enough to hold the wheel in place without distorting the flange Let the tool come up to speed prior to grinding or cutting Don’t stand in front of the wheel as it comes up to full speed Use eye and/or face protection Ensure the spindle speed doesn’t exceed the maximum speed marked on the wheel
- 15. Abrasive Wheel Work Rests Keep work rests not more than 1/8th inch from wheel surface This prevents jamming the work between the wheel and the rest, which may cause the wheel to break Don’t adjust wheel while it’s rotating
- 16. Guarding Guard exposed moving parts of power tools Guard belts, gears, shafts, pulleys, sprockets, spindles, flywheels, chains, or other moving parts Never remove a guard when a tool is in use
- 17. Guarding - Point of Operation The point of operation is where the work is actually performed on the materials – it must be guarded This shows a radial arm saw equipped with proper point of operation guards
- 18. Guarding Protection Machine guards must protect the operator and others from: Point of operation In-running nip points Rotating parts Flying chips and sparks Nip Point
- 19. Radial Saw Guarding Guard to prevent the operator from coming in contact the the rotating blade Radial arm saw equipped with an upper and lower blade guard
- 20. Guarding Portable Circular Saws Guard these saws above and below the base plate or shoe. The lower guard must cover the saw to the depth of the teeth.
- 21. Table Saw Guarding Use a hood for guarding Hood guard
- 22. Pneumatic Tools Powered by compressed air Includes nailers, staplers, chippers, drills & sanders Main hazard - getting hit by a tool attachment or by a fastener the worker is using with the tool Take the same precautions with an air hose that you take with electric cords Nail Gun - Cut-Away View
- 23. Pneumatic Tools - Fastening Ensure tool is fastened securely to the air hose to prevent a disconnection Use a short wire or positive locking device attaching the air hose to the tool Wire used to secure hose
- 24. Pneumatic Tool Connections Unacceptable Acceptable Hose clamp
- 25. Pneumatic Tool Safety Place a safety device on the muzzle to prevent the tool from ejecting fasteners, unless the muzzle is in contact with work surface Install a safety clip or retainer to prevent attachments, such as chisels on a chipping hammer, from being ejected Wear eye protection. Wear hearing protection with jackhammers. Muzzle in contact with work surface
- 26. Compressed Air Cleaning Don’t use compressed air for cleaning Exception - where reduced to less than 30 p.s.i. with effective chip guarding and PPE
- 27. Liquid Fuel Tools Usually gas powered Main hazard – fuel vapors Use only approved flammable liquid containers Before refilling a fuel-powered tool tank, shut down the engine and allow it to cool
- 28. Powder-Actuated Tools User must be trained and licensed to operate Test tool each day before loading to ensure the safety devices are working properly Wear suitable ear, eye, and face protection Select a powder level that will do the work without excessive force
- 29. Fatal Fact Employee killed when struck in head by a nail fired from a powder actuated tool. Tool operator was attempting to anchor a plywood form in preparation for pouring a concrete wall
- 30. Easily Penetrated Material Avoid driving into materials easily penetrated unless materials are backed by a substance that will prevent the pin or fastener from passing through Also, don’t drive fasteners into very hard or brittle material that might chip or splatter, or make the fasteners ricochet
- 31. Powder-Actuated Tool Safety Tips Don’t use in explosive or flammable atmosphere Inspect tool before use to ensure: it is clean, that moving parts operate freely the barrel is free from obstructions and has the proper shield, guard, and attachments Don’t load the tool unless using immediately Don’t leave a loaded tool unattended Keep hands clear of the barrel end Never point the tool at anyone Store unloaded in a locked box
- 32. Jacks To set up a jack, ensure: The base is on a firm, level surface It’s centered The jack head is placed against a level surface You apply the lift force evenly Lubricate and inspect jacks regularly
- 33. Jacks - Capacity The manufacturer's rated capacity must be marked on all jacks and must not be exceeded All jacks must have a stop indicator that is not exceeded
- 34. Jacks - Blocking Immediately block the load after it is lifted. Put a block under the base of the jack when the foundation is not firm, and place a block between the jack cap and load if the cap might slip. Photo - handyman jack is provided a firm base by using the railroad tie. The load is cribbed to prevent it from falling.
- 35. Summary Hazards are usually the result of improper tool use or not following one or more of these protection techniques: Inspecting the tool before use Using PPE (Personal Protective Equipment) Using guards Properly storing the tool Using safe handling techniques
Editor's Notes
- #2: 1926 Subpart I - Tools – Hand and Power This presentation is designed to assist trainers conducting OSHA 10-hour Construction Industry outreach training for workers. Since workers are the target audience, this presentation emphasizes hazard identification, avoidance, and control – not standards. No attempt has been made to treat the topic exhaustively. It is essential that trainers tailor their presentations to the needs and understanding of their audience. This presentation is not a substitute for any of the provisions of the Occupational Safety and Health Act of 1970 or for any standards issued by the U.S. Department of Labor. Mention of trade names, commercial products, or organizations does not imply endorsement by the U.S. Department of Labor.
- #3: Hand and power tools are a part of our everyday lives. These tools help us to perform tasks that otherwise would be difficult or impossible. However, even simple tools can be hazardous, and have the potential for causing severe injuries when used or maintained improperly. Special attention toward hand and power tool safety is necessary in order to reduce or eliminate these hazards.
- #5: 1926.301 • If a screwdriver is used as a chisel, the tip of the chisel may break and fly off, hitting the user or other employees. • If a wooden handle on a tool, such as a hammer or an axe is loose, splintered, or cracked, the head of the tool may fly off and strike the user or other employees. • If the jaws of a wrench are sprung, the wrench might slip. • If impact tools, such as chisels, wedges, or drift pins have mushroomed heads, the heads might shatter on impact, sending sharp fragments flying toward the user or other employees.
- #6: 1926.300(c) and (a) and 1926.25 Provide the necessary PPE to employees using hand and power tools to protect them from hazards of falling, flying, abrasive, and splashing objects, or exposure to harmful dusts, fumes, mists, vapors, or gases.
- #7: 1926.300(b) and 1926.302
- #8: 1926.300(d) Switches Use "on-off" control : hand-held powered platen sanders, grinders with wheels 2-inch diameter or less, routers, planers, laminate trimmers, nibblers, shears, scroll saws, and jigsaws with blade shanks one-fourth of an inch wide or less Use momentary contact "on-off" control and may have a lock-on control provided that turnoff can be accomplished by a single motion of the same finger or fingers that turn it on: hand-held powered drills, tappers, fastener drivers, horizontal, vertical, and angle grinders with wheels greater than 2 inches in diameter, disc sanders, belt sanders, reciprocating saws, saber saws, and other similar operating powered tools. Use a constant pressure switch which shuts off power when released: All other hand-held powered tools, such as circular saws, chain saws, and percussion tools without positive accessory holding means
- #10: 1926.302(a)(2)
- #11: 1926.302 (a)(1) Three-wire cords contain two current-carrying conductors and a grounding conductor. Any time an adapter is used to accommodate a two-hole receptacle, the adapter wire must be attached to a known ground. The third prong must never be removed from the plug. Double-insulated tools are available that provide protection against electrical shock without third-wire grounding. On double-insulated tools, an internal layer of protective insulation completely isolates the external housing of the tool.
- #12: When using gloves, make sure they will not cause an amputation hazard by becoming loose clothing.
- #13: 1926.303(b)(2), 1926.303 (c)(5)
- #14: 1926.303 (c)(7) A stable and undamaged wheel when tapped will give a clear metallic tone or “ring.”
- #15: 1926.303 (c)(8), 1926.303 (c)(9)
- #16: 1926.303(e) On offhand grinding machines, use work rests to support the work. They are to be equipped with adjustable work rests to compensate for wheel wear. The work rest shall be securely clamped after each adjustment. The adjustment shall not be made with the wheel in motion. 1926.303(c)(2) Floor and bench-mounted grinders shall be provided with work rests which are rigidly supported and readily adjustable. Keep these work rests not more than one-eighth inch from the surface of the wheel.
- #17: 1926.300(b)(2)
- #18: 1926.300 (b)(4) and 1926.304(g) The guarding device shall be designed and constructed to prevent the operator from having any part of his body in the danger zone during the operating cycle.
- #19: 1926.300(b)(3) and 1926.300(b)(4)(ii) Examples of guarding methods are - barrier guards, two-hand tripping devices, electronic safety devices, etc. Belt sanding machines must be provided with guards at each nip point where the sanding belt runs onto a pulley.
- #20: 1926.304(g)(1) The upper hood shall completely enclose the upper portion of the blade down to a point that will include the end of the saw arbor. Construct the upper hood in a manner and of material that will protect the operator from flying splinters, broken saw teeth, etc., and will deflect sawdust. Guard the sides of the lower exposed portion of the blade to the full diameter of the blade by a device that will automatically adjust itself to the thickness of the stock and remain in contact with stock being cut to give maximum protection possible for the operation being performed.
- #21: 1926.304(d) The upper guard shall cover the saw to the depth of the teeth, except for the minimum arc required to permit the base to be tilted for bevel cuts. The lower guard shall cover the saw to the depth of the teeth, except for the minimum arc required to allow proper retraction and contact with the work. When the tool is withdrawn from the work, the lower guard shall automatically and instantly return to the covering position. GRAPHIC The graphic depicts a portable saw where the worker is holding the bottom guard up to demonstrate how it slides up as the blade comes in contact with the material being cut.
- #22: 1926.304(h)(1) Hand-fed crosscut table saws Each circular crosscut table saw shall be guarded by a hood
- #24: 1926.302(b)(1)
- #25: 1926.302(b )(1) and (2) Secure pneumatic power tools to the hose by some positive means to prevent the tool from becoming accidentally disconnected. Safety clips or retainers shall be securely installed and maintained on pneumatic impact tools to prevent attachments from being accidentally expelled.
- #26: 1926.302(b)(2), 1926.302(b)(3)
- #27: 1926.302(b)(4) The 30 p.s.i. requirement does not apply for concrete form, mill scale and similar cleaning purposes.
- #28: 1926.302(c) If using a fuel powered tool in an enclosed area such as a trench, be aware that carbon monoxide generated can displace or deplete oxygen. Mechanical ventilation and testing needs to be done.
- #29: 1926.302(e)
- #30: Fatal Facts A 22-year-old carpenter’s apprentice was killed when he was struck in the head by a nail fired from a powder-actuated nail gun. The nail gun operator fired the gun while attempting to anchor a plywood concrete form, causing the nail to pass through the hollow form. The nail traveled 27 feet before striking the victim. The nail gun operator had never received training on how to use the tool, and none of the employees in the area was wearing PPE. In another situation, two workers were building a wall while remodeling a house. One of the workers was killed when he was struck by a nail fired from a powder-actuated nail gun. The tool operator who fired the nail was trying to attach a piece of plywood to a wooden stud. But the nail shot though the plywood and stud, striking the victim. Below are some OSHA regulations that should have been followed. • Employees using powder- or pressure-actuated tools must be trained to use them safely. • Employees who operate powder- or pressure-actuated tools must be trained to avoid firing into easily penetrated materials (like plywood). • In areas where workers could be exposed to flying nails, appropriate PPE must be used.
- #31: 1926.302(e)(8)
- #33: 1926.305(d)(1)(iii), 1926.305(d)(1)(iv) Inspect jacks according to this schedule: (1) for jacks used continuously or intermittently at one site - at least once every 6 months, (2) for jacks sent out of the shop for special work - inspect when sent out and inspect when returned (3) for jacks subjected to abnormal loads or shock - inspect before use and immediately thereafter.
- #34: 1926.305(a)(1)
- #35: 1926.305 (c), 1926.305(d)(1) When it is necessary to provide a firm foundation, block or crib the base of the jack. Where there is a possibility of slippage of the metal cap of the jack, place a a wood block between the cap and the load.