Document K68xqxpXBge0rqXmy9ydBZk2Q

Hand and Portable Power Tools tncal equipment designed for this exposure should be used to minimize the explosion hazard Fire extinguishers approved for elec trical or Class C fires should be available, and employees should be told what to do in case of fire Soldering irons are the source of bums and of illness resulting from inhalation of fumes Insulated, noncombustible holders will prac tically eliminate the fire hazard and the dan ger of bums from accidental contact Ordi nary metal covering on wood tables is not sufficient because the metal conducts heat and may ignite the wood below Holders should be designed so that em ployees cannot accidentally touch the hot irons if they reach for them without looking The best holder completely encloses the heated surface and is inclined so that the weight of the iron prevents it from falling out (Fig 32-23) Also see N SC Data Sheet 445, Hand Soldenng and Brazing Harmful quantities of fumes from lead sol dering should not be allowed to accumulate Local regulations may require exhaust facili ties if much lead soldenng is done Even if lead fumes are not present m harmful quanti ties, it may be desirable to exhaust the nui sance fumes and smoke Air samples should be taken to venfy that the amount of lead m the air is not harmful Lead solder particles should not be allowed to accumulate on the floor and on work tables If the operation is such that the solder or flux may spatter, employees should wear face shields or do the work under a transparent shield Air power tools Air hose. An air hose presents the same tnpping or stumbling hazard as do cords on electnc tools Persons or matenal acciden tally hitting the hose may unbalance the op erator or cause the tool to fall from an over head place An air hose on the floor should be protected against trucks and pedestrians by two planks laid on either side of it or by a runway built over it It is preferable to sus pend hoses over aisles and work areas Workmen should be warned against discon necting the air hose from the tool and using it for cleaning machines or removing dust from clothing Accidents sometimes occur when the air hose becomes disconnected and whips about A short chain attached to the hose and to the tool housing will keep the hose from whip ping about if the coupling should break Air should be cut off before attempting to discon nect the air hose from the air line Air pres sure inside the line should be released before disconnecting A safety check valve installed m the air line at the manifold will shut offthe air supply automatically if a fracture occurs anywhere in the line If kinking or excessive wear of the hose is a problem, it can be protected by a wrapping of strip metal or wire One objection to ar mored hose is that it may become dented and thus restrict the flow of air Air power grinders require the same type of guarding as electnc gnnders Maintenance of the speed regulator or governor on these machines is of particular importance m order to avoid over-speeding the wheel Regular inspection by qualified personnel at each wheel change is recommended Pneumatic impact tools, such as riveting guns and jackhammers, are essentially the same m that the tool proper is fitted into the gun and receives its impact from a rapidly moving reciprocating piston dnven by com pressed air at about 90 psi pressure FlG 32-24 --Chipping hammer safety retainer pre vents the discharge of the tool Courtesy Chicago Pneumatic Tool Co 970