CONCRETE OR ASPHALT CUTTING METHODS During cutting, do not exert excessive side pressure on the handles as a method of steering. Do not force the blade into material by lowering the blade too quickly or by increasing the speed of the saw. The larger diameter blades, 450mm and above, are systematically used in a step cutting method at cutting depths of 5cm to 8cm in short travel distances of 15 to 20min. This allows the blade to remain in a free cutting condition and can allow for up to 30% reduction of the total cutting time. For the deepest cuts (> 20cm), it is recommended to make the first cutting-steps with a small diameter diamond blade (≤ 450mm), and then to use a larger diameter diamond blade only for last deepest steps. This procedure preserves the lifespan of the most expensive blade. GREEN CONCRETE CUTTING METHODS Green concrete is cut to control cracking in large concrete floors. The initial cutting of the concrete is done within a 24 hour period at a depth of 1/3 to 1/4 of the total concrete thickness. Generally 300 and 350mm diameter blades are used with 3 or 4mm widths. After the initial cut has been made, the joint may require additional widening for the backing rod and/or sealant. This requires a blade diameter of 300 or 350mm in widths up to 10mm. This operation requires sometimes ‘Bevel’ blades with triangular segments to generate a chamfer on the joint edges. CORE DRILLING TECHNIQUES Drilling can be made with handheld or fixed equipment. Handheld drilling has the advantage to require less preparation and is a faster operation, but is recommended for drilling diameters up to 150mm only. Handheld motors safety clutch are designed to protect the end-user against hand-arm injuries and are thus fitted to much less torques than for a fixed drilling operation. Fixed drilling requires more preparation work to fasten properly the equipment, but then allows much larger drilling diameters with non-limited torques. You can consult our product selection charts to choose the best tool for each of your requirements. THE PERFORMANCE OF ANY DIAMOND CORE BIT DEPENDS HEAVILY ON THE USE OF PROPER DRILLING TECHNIQUES. ALTHOUGH DRILLING CONDITIONS AND MATERIALS MAY VARY, FOLLOWING SPECIFIC GUIDELINES & SAFETY PRECAUTIONS ENSURES SAFE, FASTER DRILLING SPEED AND LONGER BIT LIFE. DRILLING ADVICE IMPORTANT: Always wear proper safety equipment; wear safety glasses, safety footware, hearing and head protection, and respiratory equipment where required. 312
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