Diamond Blade Problems Diagnosis
Blade Will Not Cut
The bond is too hard for materials being cut; check the specification is correct. Glazed blades can be opened up by cutting a soft, abrasive material. Machine has insufficient horsepower for the specification being used or the machine drive belts need re-tensioning. Ensure correct direction or rotation.
A common cause of blade failure, overheating can cause many other problems such as loss of tension, blank cracks, and segment loss. Overheating can be shown by black or blueish discoloration on the steel blank. For wet blades, inadequate water supply can be caused by blocked or damaged feed inlets. Trickle feed for dust suppression van cause excessive abrasion. Do not push blade too hard, allow the blade to cut freely.
Uneven Segment Wear
Wet cutting with insufficient water, generally on one side of the blade. Flush water system and ensure water is equally distributed to both sides of the blade. Blade is worn out of round due to bad bearings or worn shaft. Replace and repair bearings or shaft as required. Segments worn in one side reducing side clearance (check alignment). Check wheels and wheel alignment on floor saw and carriage alignment on masonry bench saws.
Loss of Tension
Blade blank has been overheating. Ensure sufficient water supply for wet cut blades. The bond is too hard for the application causing the blade to deviate in the cut. Check machine is running at the correct RPM that there is no wear on machine bearing shaft and that the flanges are of the correct and same size. Ensure blade is secure and not spinning on the spindle. Check that the drive pin is in place on all floor saws. Ensure that the blade cuts in straight lines only.
Out of Round
Blade shaft bearing may be worn. Fit new bearing and ensure regular lubrication. The blade is too hard for the material being cut, resulting in the blade hammering and glazing. Choose a blade with a softer bond. The machine spindle may have a groove scored in it as a result of a previous blade slipping on the spindle.
Damaged Or Distorted Arbor Hole
Blade incorrectly aligned when mounting, causing the blade to hammer. Ensure blade is mounted on the proper diameter of the spindle before tightening. Ensure that pin hole slides over drive pin. Flanges are not properly tighten or cleaned allowing the blade to spin or vibrate on spindle. Saw shaft is badly worn or grooved, allowing the blade to pound.
Blade specification is too soft for the materials being cut causing the diamond to become over exposed. Use a blade with a harder bond system. Loose drive belts causing intermittent revolutions. Inadequate water supply caused by blocked or damaged water inlets.
The effect of premature wear of a steel blank is a particular problem in highly abrasive materials such as asphalt and green concrete. The steel blank wears to a knife-edge just below the segment and may result in segment loss. Ensure the blade has undercut protection on steel center to assist in the removal of slurry from the cut and protect the steel center. Ensure the blade is not cutting below the asphalt into the sub-base below, as this constant rubbing of the loose material results in premature wear and can be dangerous. Check water supply, as increased water flow will help wash slurry from the cutting area and reduce undercutting.
The material was not held firmly. Causing the blade to twist or jam in the cut. Twisting or turning the machine while the blade is in the cut. Blade too hard for the material being cut, resulting in the blade hammering in the cut. Blade flanges are worn or deformed and fail to provide support, causing the blade to deflect in the cut. Foreign material between the flange and the blade blank causing the bade to flutter, resulting in segment loss due to impact or fatigue.
Blade specification is too hard for material being cut, causing hammering in the cut. Use a blade with a softer bond system. Peripheral speed of blade too high, check rotational speed of the blade.
Blade is too hard for the material being cut. Excessive cutting pressure, resulting in the blade blank bending and flexing. Insecure mounting causes fluttering of the blade. Ensure blade is correctly mounted, drive pin used clamp nut is tightened.