Diamond Blade Troubleshooting Guide
BLADE BORE OUT-OF-ROUND
CAUSES
REMEDIES
Blade collar is not properly tightened, permitting blade to either rotate or vibrate on shaft. Blade collars are worn or dirty not allowing proper blade clamping.
Tighten the spindle nut with a spanner to make certain that the blade is adequately secured to prevent rotation on shaft. Clean blade collars, making sure they are not worn. Tighten arbor nut properly. Make certain the blade is mounted on the proper shaft diameter before tightening arbour nut. On concrete saws, make certain the pin hole slides over arbour drive pin. Never depend on the drive pin to actually drive the blade. A drive pin is simply a safety measure to prevent the blade from spinning on its spindle should the nut become loose. Use as much water as possible to flush out fines generated during cutting or use blades with undercut protection. NOTE: Blades with undercut protection are not always the final answer to eliminating undercutting. Are must still be taken to provide sufficient water to the steel centre are immediately adjacent to the segment. This is especially important when making deep cuts. Install new blade shaft bearings or blade shaft, as required. Tune engine according to saw manufacturer’s manual. For large diameter blades it may be possible to rebraze segments to a new centre.
Blade is not properly mounted.
Abrading or wearing away of the steel centre faster than the diamond segment is due to highly abrasive fines generated during cutting.
UNDERCUTTING STEEL CENTRE
Shaft bearings on masonry or concrete saws are worn, causing the blade to run eccentrically and wear out-of-round. Engine is not properly tuned on concrete saws, causing surges in blade rotation. Blade spindle hole is damaged from previous mismounting. Blade mounting spindle is worn. A groove may have been scoured on the mounting spindle as a result of previous blades spinning on the arbor. When a new blade is placed on such a worn spin- dle, it seats improperly and runs eccentrically. Blade slips on arbor shaft. Bond is too hard for material causing machine to ‘pound’ at regular intervals, wearing one half of the blade more that the other half.
BLADE WORN OUT-OF-ROUND
Replace worn shaft or spindle bushing.
On a masonry saw, tighten the blade collar. On a concrete saw, make certain that the drive pin is functioning.
Use proper blade specification.
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