Power Tools
Used widely in the construction industry, power tools are powered by electric motors, petrol or diesel or via a compressed air motor. There are two classifications of power tools, either stationary or hand-held ‘portables’. Stationary tools are known for their speed of operation and power. Portable tools can also be battery operated. Their main advantages are their ease of use in confined spaces and their relatively lower cost. One of the downsides to using power tools is the vibration and noise produced during their operation.
Diamond Blades
Often used in circular saws, diamond blades are made from a steel core, powdered metal compounds and diamond crystals. These crystals are bonded to the blade by the process of heating and pressing into a moulding creating the diamond ‘segments’. These segments make up the blades cutting teeth. This blade is then welded to the steel core.
Other methods of manufacture include electroplating diamond crystals directly to the core metal plate. Sometimes other metals are used instead of steel and other methods may be used depending on the intended application. Some cores have gullets, effectively spaces, between the segments to allow for cooling and the removal of slurry. Others have a single continuous rim to allow smooth cuts to be made without chipping the material being cut.
Diamond blades are used for circular saws used primarily when cutting abrasive or hard surfaces such as those found in the construction industry during building works. When used in band or chain saws the blades are ideal for creating controlled shapes.
Instead of cutting, diamond blades grind down the surface using their rectangular segments or teeth. These teeth contain diamond crystals on their tips enabling them to grind through even the hardest of materials. The choice of bonding compound effects the rate of wear and the life of the blade. Softer bonds will wear down more quickly, exposing new diamond segments to ensure the edge stays sharp. This makes the choice of bond of paramount importance, it must be tailored to the specific material you need to work to be economical.
Water can be used to prevent overheating and improve efficiency, however this cannot be used on electrical saws. The diamond blades are unable to cut ceramic or abrasive materials if the temperature is not controlled sufficiently. Using water creates the optimal cutting environment and extends blade life significantly.
Water can also be used to remove the slurry from the cutting area and reduces the dust generated. This dust would pose a serious health risk to the operator and anyone working nearby. If using dry cutting blades they must be periodically cooled by allowing the blade to operate without cutting the material ‘in air’. The air flow will then pass over the blade’s segments reducing the surface temperatures.
Concrete Cutting Projects
Projects where concrete cutters are used include; building works, demolition, conduits for services or pipes, civil engineering works, road sawing, expansion joint cutting, installing concrete fixings, creating openings for lifts, stairwells, doorways, windows and many others.
Under Reaming
Under reaming is used where securely anchoring equipment or fixings is of paramount importance. The process is used to create grooved slots into holes that can be used for securing anchor bolts, masts, and starter bars. Applications include rail anchor bolts, heavy industrial machinery fixing and telephone mast bolting.
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