Diamond Blade Troubleshooting

Diamond Blade Troubleshooting

 

Blade Worn Out of Round

CauseShaft bearings are worn (masonry and concrete).
RemedyInstall new blade shaft bearings or blade shaft, as required.
CauseEngine is not properly tuned on concrete saws, causing surges in blade rotation.
RemedyTune engine according to manufacturers’ manual.
CauseBlade arbor hole is damaged from previous mismounting.
RemedyReplace worn shaft or mounting arbor bushing. Bond is too hard for material, causing a “rounding” and wearing one half of the blade more than the other. Make certain that drive pin is functioning. Use proper blade specification


Blade Will Not Cut

CauseBlade is too hard for material being cut.
RemedyUse a softer bonded blade. Select proper blade specification for material being cut.
CauseBlade has become dull as a result of being used on too hard a material
RemedyImproper blade specification; blade is too hard for the material being cut. Use a softer bonded blade to reduce operating stresses.
Cause“Dull” Blade
Remedy“Open” blade by dressing segment on abrasive block.


Uneven Segment Wear

Drawing of Uneven Segment Wear
CauseInsufficient water (usually on one side of blade).
RemedyFlush out water system and check flow and distribution to both sides of blade.
CauseEquipment defects cause the segments to wear unevenly.
RemedyReplace bad bearings, worn arbor shaft or misalignment to spindle. Concrete saws, engine must run smoothly to prevent harmonic vibration.
CauseSaw is misaligned.
RemedyCheck saw head alignment for squareness both vertically and horizontally


Arbor Hole Out-of-Round

CauseBlade collar is not properly tightened, permitting blade rotation or vibration on the shaft.
RemedyTighten the shaft nut with a wrench to make certain that the blade is adequately secured.
CauseBlade collars are worn or dirty, not allowing proper blade clamping.
RemedyClean blade collars, making sure they are not worn.
CauseBlade is not properly mounted.
RemedyMake certain the blade is mounted on the proper shaft diameter before tightening shaft nut. Ensure the pin hole slides over drive pin. Make sure that drive pin is in pin hole.
CauseLoose Belt on saw.
RemedyTighten belts. Check to see if arbor on saw is running true.


Undercutting the Steel Center

Drawing of Undercutting the Steel Center
CauseAbrasion of steel center due to highly abrasive fines generated during cutting.
RemedyUse as much water as possible to flush out fines generated during cutting, or use wear-retardant cores.
CauseCutting through material into sub-base.
RemedyWear-retardant cores are not always the ultimate solution to eliminating undercutting. Your best defense is to always provide an adequate water flow to the steel center area immediately adjacent to the segment. This is especially important when making deep cuts.


Segment Cracks

Drawing of Segment Cracks in Blade
CauseBlade is too hard for material being cut.
RemedyUse a blade with a softer bond.
CauseBlade being “forced” through the cut causing chattering
RemedyRun Saw at normal speed. “Open” blade by resharpening in abrasive material.


Blade Wobbles

Drawing of Blade Wobbles
CauseBlade runs at improper speed.
RemedyCheck for bad bearings, bent shaft, or worn mounting arbor. Speed of the saw is either too fast or too slow for the size of the blade: RPM of the saw should be verified to the specific speeds established by the NASI Standards for minimum and Maximum blade speeds; make certain that blade shaft is running at recommended RPM to match tensioned speed of blade. Should the blade continue to wobble after verification of the saw RPM, then the blade should be returned to the manufacturer to be retensioned and flattened.
CauseBlade collar diameters are not identical.
RemedyCheck blade collar discs to make sure they are clean, flat and of correct diameter
CauseBlade is bent as a result of dropping or being twisted in the cut during operation.
RemedyBlade should be returned to the manufacturer to be retensioned and flattened.
CauseLoss of blade tension.
Remedy(see loss of tension)


Segment Loss

Drawing of Segment Loss on Blade
CauseOverheating due to lack of water.
RemedyCheck water feed lines and make sure flow is adequate on both sides of blade.
CauseSteel center is worn from undercutting.
RemedyUse sufficient water to flush out the cut.
CauseDefective blade collars are causing blade misalignment.
RemedyClean blade collars or replace if collars are under recommended diameter.
CauseBlade is too hard for material being cut.
RemedyUse proper blade specification for material being cut.
CauseBlade is cutting out of round, causing a pounding motion.
RemedyReplace worn bearings; realign blade shaft or replace worn blade mounting arbor.
CauseImproper blade tension.
RemedyEnsure blade is running at correct RPM. Blade is tensioned for correct RPM. Tune engine according to manufacturers’ manual.


Cracks in Steel Center

Drawing of Cracks in Steel Center
CauseBlade flutters in cut as a result of blade losing tension.
RemedyTighten the blade shaft nut. Make sure blade is running at proper tensioned speed and that drive pin is functioning properly.
CauseBlade specification is too hard for the material being cut.
RemedyUse a softer blade bond to eliminate stresses that create cracks.
CauseBad blade shaft bearing.
RemedyReplace blade shaft bearing.
CauseOverheating due to lack of water.
RemedyCheck water feed lines and make sure flow is adequate on both sides of blade.


Loss of Tension

Drawing of Loss of Tension in Blade Core
CauseSteel center has been overheating as a result of blade spinning on arbor.
RemedyCheck water flow, distribution and lines. Tighten the blade shaft nut. Make certain the drive pin is functioning (on concrete saws).
CauseSteel center has been overheating from rubbing the side of material being cut.
RemedyMake certain blade RPM is correct so the blade operates at its tensioned speed. Tune engine according to manufacturers’ manual.
CauseUnequal pressure at blade clamping collars.
RemedyBlade clamping collars must be identical in diameter and the recommended size.


Short Blade Life

CauseBlade bond or matrix too soft.
RemedyUse a harder matrix blade.
CauseOverheating due to lack of water.
RemedyCheck water feed lines and make sure flow is adequate on both sides of blade.