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| Dry Cutting |
| 1. Do clean the flanges
before mounting the blade and check both plates are the same diameter. 2. Do ensure that the blade is correct for the material being cut. 3. Do ensure that the arrow on the blade corresponds with the direction of rotation of the machine spindle. 4. Do ensure that the blade is in balance and running true. A blade which is out of balance means increased wear and even possible destruction of the saw. Ensure that the blade is concentric to within 0.15mm. 5. Do ensure that the machine bearings and spindle are not worn or blade life will be reduced. 6. Do use the blade with a gentle reciprocating motion. - especially when cutting hard materials, and cut in the direction of the arrow. 7. Do avoid tilting the blade when cutting. 8. Do only use the machine which have an approved safety guard. 9. Do remove the diamond blade from the machine during transit to prevent accidental damage. 10. Do inspect blades frequently to detect cracks or undercutting of the steel core and segments which could lead to segment loss. 11. Do ensure that the machine is not dropped on the blade. 12. Don't use your blade on metals or other unsuitable materials. If you have any doubt, please contact supplier. 13. Don't let excessive heat be generated at the cutting edge of the blade. |
| Wet Cutting |
| 1. Do ensure adequate
water supply to both sides of the blade. 2. Do ensure that the blade cuts parallel to the wheel axis. 3. Do follow the manufacturers recommended pulley sizes and operating speeds for specific blade diameters. 4. Do tighten drive belts to ensure full available power. 5. Do use drive pin if fitted to the machine. 6. Don't force blade on blade shaft of mount blade on undersized spindle. 7. Don't force the machine so that the blade rides up out of the cut. 8. Don't operate machine with damaged or open blade guard. |
| Segments: Segment Loss (Do not use blades with missing segments) |
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| CAUSE | REMEDY |
| The material and/or saw was not held firmly, which caused the blade to twist or jam in the cut and loosen the segment. | Hold material or saw firmly. |
| Not sawing in a straight line with overcorrecting causing the blade to twist or jam in the cut and loosen the segment. | Properly align saw to permit square cutting, avoid twisting the blade in the cut. |
| Overheating due to inadequate supply of coolant (water or air). This is usually accompanied by discolorations which appear on the core in the area of segment loss. Overheating of blades may cause core cracks or segment loss. | Wet Cutting - Provide adequate
water flow on both sides of the blade. Look for the line blockage. On
concrete saws, temporary loss of water can result from equipment running
over water feed hoses. Dry Cutting - Periodically allow blades to run out of the cut. The blade will cool in a few seconds so that sawing may continue. |
| Core worn thin as a result fo undercutting by abrasive fines generated during cutting. (Core wears to a knife edge, which weakens the core and causes a segment to be separated.) | If generated fines are highly abrasive, wear-resistant cores should be used to retard undercutting. Blades must be inspected periodically during use. (Wet Cutting - Use sufficient water to flush fines out of cut.) |
| Defective flanges which cause the blade the flutter in the cut or fail to adequately support the blade in perfect alignment. | Clean foreign material from flange surfaces or replace flanges if they are under manufacturer's recommended diameter or are bent or deformed. |
| Blade is too hard for material being cut causing excessive dullness and the segment separates due to impact or fatigue. (This can also be the cause of functional heat, which can melt the brazing solder.) | Use the proper blade specification for the material being cut. |
| Blade is cutting out of round resulting in a pounding impact. | Replace worn parts (bearings, machine spindle, etc.) |
| Improper blade operating speed which produces high pressure on the segments and subsequent failure of the brazed joint, core or segment. | Make sure spindle RPM of the equipment is specified when ordering blades. The spindle speed should be checked with a tachometer to ensure that each diameter blades does not exceed the blade manufacturer's recommended RPM. |
| Segments: Uneven Segment Wear |  |
| CAUSE | REMEDY |
| Wet Cutting - Insufficient water, generally on one side of the blade, which reduces side clearance. | Flush water system. Make certain that water is being adequately and equally distributed to both sides of the blade. |
| Equipment defect, which causes the blade to wear out of round. | Replace bad bearings, worn machine spindle or realign misaligned spindle. On concrete saws, make certain 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 to squareness both vertically and horizontally. |
| Segments: Crack in Segment |  |
| CAUSE | REMEDY |
| Blade is too hard for material being cut. | Use blade with softer bond. |
| Short Life |
| CAUSE | REMEDY |
| Using the wrong blade on a specific material. A blade specifically designed and manufactured for cutting tile will wear out extremely fast if used on highly abrasive material such as block. Also, avoid the use of general purpose specifications for cutting a single specific material. General-purpose diamond blades are designed to cut a range of materials. Since it is unlikely that the operator will be cutting the proper amount of both hard and soft materials proportionately at all times, this is not the most economical method of cutting. | Use the proper blade specifications, as recommended by the manufacturer. |
| Wet Cutting - Inadequate water to the blade. | Make sure water hoses are clean and free from any blockages. Approximately two gallons of water per minute are required to properly cool a masonry saw blade. On concrete saws, 2-5 gallons per minute are required. |
| Bad spindle bearings, worn blade arbor or misaligned machine spindle. | Replace defective parts. |
| Loss of power, resulting from loose drive belts or improper voltage. | See instruction manual for proper belt tightening, replace worn belts, make sure proper line voltage is being supplies to the motor. |
| Dry Cutting - Using blades on saws with engine size larger that the blade manufacturer's recommendation. | Dry Cutting - Use blades only on the saws for which they are recommended. |
| Blade Will Not Cut |  |
| CAUSE | REMEDY |
| Blade is too hard for material being cut. (Improper blade specification.) | Consult blade recommendation chart for the proper blade specification for the material being cut. |
| Blade has befome dull, probably as a result of being used on too hard a material. | Dress of sharpen by cutting softer abrasive material to expose diamonds. If continual dressing is required, this would indicate that the blade specification is too hard for the material being cut. |
| Failure to initially break in new blade on specific material being cut. | Allow blade to sharpen itself on the material to be cut when first placing it on the saw. This is the proper way to break in a blade. Do not force the blade into the cut as this will generally aggravate the problem. |
| Insufficient power to permit blade to cut properly. | Tighten belts in accordance with machine maintenance instructions. Use correct voltage at motor and/or use adequate horsepower for cutting application. |
| Dry Cutting - Blades will become dull as a result of overheating and the diamond rim "mushrooming" or melting. | Dry Cutting - discontinue use, contact the manufacturer. |
| Blade Core Warpage |  |
| CAUSE | REMEDY |
| Blade core has been overheated. | Wet Cutting - provide proper
amount of water to both sides of blade. Check to make sure water pump is
producing sufficient water and that no blockages occur in water lines. Dry Cutting - periodically allow the blade to run out of the cut. The blade will cool in a few seconds so that sawing may continue. If blade has been warped (dark blue color) it may be damaged beyond repair. Discontinue use. |
| 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 functioning on concrete saws. |
| Blade core has been overheated because of blade core rubbing side of material being cut. | Properly align machine to permit square cutting. Avoid twisting the blade in cut. Maintain a firm grip on material and/or saw. Make certain that spindle RPM is correct so that blade operates at its recommended speed. |
| Unequal pressure on flanges. | Flanges should be identical in diameter and of the recommended size. |
| Machine spindle RPM does not match blade RPM. | Use blade with proper RPM to match machine spindle RPM. |
| Blade Wobbles |  |
| CAUSE | REMEDY |
| Blade mounted on a damaged or worn machine. | Check for damaged or worn bearings, bent or worn 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 certain that the spindle is turning at the proper RPM to match the recommended speed of the blade. Use a tachometer to make certain machine spindle is set at proper operating speed. |
| Blade bent. | Do not use, contact manufacturer. |
Cores (also known as steel center, blade blanks): Core Cracks |
 |
| CAUSE | REMEDY |
| Blades with core cracks. | Discontinue use, contact manufacturer. |
| Cores: Blade Core Undercutting |  |
| CAUSE | REMEDY |
| Abrading or wearing away of the steel center faster than the diamond segment. (Highly abrasive fines are being generated during cutting.) | If generated fines are highly abrasive, wear-retardant cores should be used. Wet Cutting - use sufficient water to flush fines out of cut. NOTES OF CAUTION: Wear-retardant cores are not always the final answer to eliminating undercutting. Blades should be inspected periodically during use. |
| Blade Worn Out-of-Round |  |
| CAUSE | REMEDY |
| Worn spindle bearings on masonry or concrete saws. | Install new spindle bearings or spindle as required. |
| Engine not properly tuned on concrete saws, causing "hunting." | Tune engine. |
| Blade arbor hole damaged from previous mismounting. | Contact blade manufacturer, discontinue use. |
| Machine spindle worn. A groove may have been scored on the spindle as a result of previous blade spinning on the spindle. | Replace worn spindle. |
| Blade slipping on spindle. | Tighten spindle nut on machine. Make certain drive pin is functioning where supplied. |
| Bond too hard for material causing machine to "pound." | Use proper blade specification. |
| Arbor Hole Out-of-Round |  |
| CAUSE | REMEDY |
| Flanges are not properly tightened, permitting blade to either rotate or vibrate on spindle. | Wrench-tighten spindle nut to make certain blade is adequately secured to prevent rotation on spindle. |
| Worn, bent or dirty flanges which do not allow proper blade clamping. | Clean or replace flanges, make sure they are not worn, and tighten spindle nut properly. |
| Balde not properly mounted. | Make certain blade is mounted on the proper diameter of spindle before tightening spindle nut. On concrete saws, make certain that pin hole slides over drive pin. Never depend on drive pin to actually drive the blade. A drive pin is simply a safety measure to prevent the blade from spinning on the spindle, should the nut become |
| In a
Nutshell... make sure ...to read operator's manual and comply with ANSI codes B7.1 and B7.5. ...the proper blades specification is being used for the material being cut. ...the blade is being operated at the proper spindle RPM for which it was recommended. ...the machine is in good operating condition. Check for- accurate spindle alignment condition of bearings proper size flanges (blade collars) proper size arbor hole undercut or worn spindle clean flanges properly tightened drive belts proper voltage at motor proper horsepower for cutting application ...the blade is not overfed by forcing it through the material. If you
overfeed or force the blade you may cause
- blade lead-off - diamond rim chipping, cracking and glazing - blade wobble - overheating - mushrooming - core cracking ...diamond rim must remain COOL. For wet cutting blades both sides of
blade must receive water equally. |
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