TROUBLESHOOTING DIAMOND PRODUCTS BLADE WORN OUT-OF-ROUND Worn out shaft bearings on saw. Install new blade shaft bearings. Machine spindle worn out. A groove may have been scored on the spindle as a result of previous blade spinning on the spindle. Replace worn out spindle. Blade slipping on spindle. Tighten spindle nut on the machine. Make certain the drive pin is fitted and functioning where required. Bond too hard for material causing blade to “pound”. Use proper blade specification, a softer bond blade maybe required. Blade being pushed to hard and not allowed to cut – causes bouncing and will lead to blade going out of round. Slow down traverse rate or reduce depth of cut. Blade spindle speed too high – causing polishing and causing blade to act hard and bounce. Reduce spindle speed to recommended RPM. BLADE IS WOBBLING Blade mounted on a damaged or worn machine. Check for damaged or worn out bearings, bent or worn out blade spindle. Also check flanges to make sure they are clean, flat, and of the manufacturer’s recommended diameter. Blade being run at improper operating speed (RPM). Make sure that the spindle is turning at the proper RPM to match the recommended speed for the diameter of blade. Use a tachometer to make certain the machine spindle is set at the proper operating speed. Blade bent. Do not use, contact manufacturer. UNEVEN SEGMENT WEAR Insufficient water flow, generally on one side of the blade, which reduces side clearance. Check pipes are clean and correctly positioned. Make certain that adequate clean water is being equally distributed to both sides of the blade. Equipment defect, which causes the blade to wear out of round. Replace bad bearings, worn out machine spindle or realign spindle. On concrete saws, ensure the engine runs smoothly, to prevent harmonic vibrations, which in turn cause the blade to pound on a regular cycle basis. Saw head misaligned. Check saw head alignment both vertically and horizontally. PREMATURE WEAR OF STEEL CENTRE Steel centre wears away faster than the diamond segment. If material cut is very abrasive, a blade with undercutting protecting segments should be used. Highly abrasive particles are being generated during cutting. Use sufficient water to flush swarf out of cut. 1. Hammer segment. 2. Double height segment. 3. Slant segment. Caution: Wear-retardant cores are not always the final answer to eliminate undercutting. Blades should be inspected periodically during use. STEEL CENTRE LOSS OF TENSION Blade core has been overheated. Provide proper amount of water to both sides of the blade. Make sure water pump is producing sufficient water, that no blockage occurs in water lines, and pipes are correctly positioned. Blade core has been overheated as a result of blade spinning on spindle. Check spindle and arbor hole for damage. Tighten spindle nut and make certain that the drive pin is present and functioning on floor saws. Blade core has been overheated because of blade core rubbing side of material being cut. Properly align machine to allow straight cutting. Avoid twisting the blade in cut. Maintain a strong grip on saw. Make certain that spindle RPM is correct so that blade operates at its recommended speed. Unequal pressure on flanges. Flanges should be of identical and the correct diameter and cleaned regularly. Machine spindle RPM does not match recommended blade RPM. If spindle speed is too high the blade will act hard and overheat, use correct spindle speed for blade diameter. 308
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