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Safety equipment


large output. They are, however, relatively heavy and the engine power can be affected by the fire gases when creating openings. In the event of an intense development of fire gases, the engine could even stop. Engine powered tools should be used with the correct safety equipment. It is important to know how the tools should be used – among other factors – due to the relatively large output and their weight. ◊ The cutting machine with twin head rotating cutting discs cuts with two metal blades that are fitted beside each other, and rotate in different directions. It can cut through stainless steel, cast iron and aluminium, wood, and certain plastics; however, it cannot be used for glass, stone, concrete or ceramics. Its maximum cutting depth is 60 to 65mm. The electric cutting machine has a relatively minor practical application for creating roof openings, primarily because of its limited power. It can be fitted with different blades, and is mainly used for cutting metal parts in different roof structures, for example, metal rods and sheet metal hatches.


◊ Tiger saws work with a reciprocating action, and can be used to saw in wood, plasterboard and metal. For the purpose of cutting sheet metal, the cutting speed is slower than that of rotary tools, but the noise level is lower and it produces fewer


sparks. The saw blade is approximately 15cm long, and the thicker the sheet metal, the lower the sawing speed.


◊ Circular saws are used to saw wood and plasterboard. Effective and relatively easy to carry during an operation, they can be used for both boarding and supporting parts in wooden roof structures. The sawing depth varies from 50 to 70 mm, depending on the manufacturer.


◊ An electric chainsaw is handy for creating openings in wooden structures. Its function can be impaired by nails and metal jointing in the roof structure – when creating openings in wooden roofs covered with tarred roofing felt, the blade can stick because of the tar.


◊ Sometimes, a special machine is used as a screwdriver, or a battery operated drilling machine is fitted with screwdriver bits or a nut sleeve. A screwdriver is useful to remove sheet metal roofing that has been screwed on.


◊ The power cutter is a heavy duty tool that can be fitted with different blades, depending on what is to be cut. Users of power cutters, and of other power tools, must be knowledgeable of the correct usage to ensure safety and efficiency. It should be run at full speed and allowed to eat its way through the material without being forced.


FOCUS


www.frmjournal.com MAY 2019


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