Trouble Shooting

Diamond Blades Troubleshooting
1.  Loss of Tension:


  • Cause: Steel center has been overheating from rubbing the side of material being cut.

  • Remedy: Make certain blade RPM is correct so the blade operates at its tensioned speed. Tune engine according to manufacturer’s manual.

  • Cause: Unequal pressure at blade clamping collars.

  • Remedy: Blade clamping collars must be identical in diameter and the recommended size.

  • Cause: Steel center has been overheating as a result of blade spinning on arbor.

  • Remedy: Check water flow, distribution and lines. Tighten the blade shaft nut. Make certain the drive pins is functioning on concrete saws.


2.  Segment Loss:

  • Cause: Improper blade tension.

  • Remedy: Ensure blade is running at correct RPM. Blade is tensioned for correct RPM. Tune engine according to manufacturer's manual.

  • Cause: Blade is cutting out round, causing a pounding motion.

  • Remedy: Replace worn bearings, realign blade shaft or replace worn blade mounting arbor.

  • Cause: Defective blade collars are causing blade misalignment.

  • Remedy: Clean blade collars or replace if collars are under recommended diameter.

  • Cause: Steel center is worn from undercutting.

  • Remedy: Use sufficient water to flush out the cut.

  • Cause: Blade is too hard for material being cut.

  • Use proper blade specification for material being cut.

  • Cause: Overheating due to lack of water.

  • Remedy: Check water feed lines and make sure flow is adequate on both sides of blade.


3.  Segment Cracks:


  • Cause: Blade being forced through the cut causing chattering.

  • Remedy: Run saw at normal operating speed. Open blade by re-sharpening in a abrasive material.

  • Cause: Blade is too hard for material being cut.

  • Remedy: Use a blade with a softer bond.

4.  Blade Will Not Cut:

  • Cause: Blade is too hard for material being cut.

  • Remedy: Use a softer bond blade. Select proper blade specification for material being cut.

  • Cause: Dull Blade.

  • Remedy: Re-sharpening blade by dressing segment on abrasive block.

5.  Arbor Hole Out of Round:

  • Cause: Blade collar is not properly tightened, permitting blade rotation or vibration on the shaft.

  • Remedy: Tighten the shaft nut with a wrench to make sure the blade is adequately secured.

  • Cause: Blade collars are worn or dirty, not allowing proper blade clamping.

  • Remedy: Clean blade collars, making sure they are not worn.

  • Cause: Blade is not properly mounted.

  • Remedy: make sure 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.

6.  Uneven Segment Wear:

  • Cause: Equipment defects cause the segment to wear unevenly.

  • Remedy: Replace bad bearings, worn arbor shaft or misalignment to spindle. When using concrete saws, make sure the engine must run smoothly to prevent harmonic vibration.

  • Cause: Saw is misaligned.

  • Remedy: Check saw head alignment for squareness both vertically and horizontally.

  • Cause: Insufficient water on both side of blade.

  • Remedy: Flush out water system and check flow and distribution to both sides of blade.

7.  Undercutting Steel Center:

  • Cause: Cutting through material into sub-base.

  • Remedy: Wear 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.

  • Cause: Abrasion of steel center due to highly abrasive fines generated during cutting.

  • Remedy: Use as much water as possible to flush out fines generated during cutting or use wear retardant cores.

8.  Cracks in Steel Core Slot:

  • Cause: Blade specification is too hard for the material being cut.

  • Remedy: Use a softer bond blade to eliminated stresses that cause cracks.

  • Cause: Overheating due to lack of water.

  • Remedy: Check water feed lined and make sure flow is adequate on both sides of blade.

  • Cause: Blade flutters in cut as a result of blade losing tension.

  • Remedy: Tighten the blade shaft nut. Make sure blade is running at proper tensioned speed and that drive pin is functioning properly.

9.  Blade Wobbles:

  • Cause: Blade is bent as a result of dropping or being twisted in the cut during operation.

  • Remedy: Blade should be returned to manufacturer to be re-tensioned and flattened.

  • Cause: Blade runs at improper speed.

  • Remedy: Check for bad bearings, belt 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.



Diamond Core Bits Troubleshooting
1.  The core bit will not cut:

  • Cause: The material is too hard for the diamond specification.

  • Remedy: Match the diamond specification to the material.

  • Cause: The bit is glazed (smooth diamonds).

  • Remedy: Re-sharpen the tool by drilling into abrasive material (sandstone, block etc.)

  • Cause: Excessive speed of rotation.

  • Remedy: Adjust speed of rotation.

  • Cause: The cooling is excessive and causes the tool to aquaplane.

  • Remedy: Reduce the water flow.

  • Cause: Excessive play within the carriage guides.

  • Remedy: Adjust the carriage on the slide to reduce play.

  • Cause: The weight on the tool is insufficient.

  • Remedy: Increase the weight on the tool.

  • Cause: The machine is badly fixed.

  • Remedy: Check that the machine’s fixing is correct.

  • Cause: The motor is too weak.

  • Remedy: Match the motor power to the diameter.

2.  Excessive wear of diamond segments:

  • Cause: Insufficient irrigation.

  • Remedy: Adjust the water flow.

  • Cause: Insufficient speed of rotation.

  • Remedy: Adjust speed of rotation.

  • Cause: Excessive speed of advance.

  • Remedy: Reduce speed of advance.

  • Cause: The material is more abrasive than expected.

  • Remedy: Use a blade with a harder diamond specification (see drill-bit selection table).

  • Cause: Too much motor power applied to the tool.

  • Remedy: Match the motor power to the drill diameter.

  • Cause: Too much play on the machine causing vibrations.

  • Remedy: Check the state of the machine.

3.  Excessive wear of core bit's steel tube:

  • Cause: The machine is badly anchored.

  • Remedy: Anchor the machine firmly.

  • Cause: The machine is incorrectly adjusted (excessive play in the carriage guides, motor spindle or adapter out of true, etc.).

  • Remedy: Correctly adjust the machine, replace worn parts, correct the play (rollers, bearings, adapters, etc.).

  • Cause: The tool is warped.

  • Remedy: Withdraw any warped tool. If it is relatively new, it may be straightened by the supplier.

  • Cause: The bit is not correctly fixed to the motor spindle.

  • Remedy: Check that the bit is correctly aligned on the motor spindle (straight line).

  • Cause: There are fragments of metal in the bottom of the hole that have not been evacuated by the coolant.

  • Remedy: Remove all the metal fragments from the drilled hole. Temporarily increase the flow of water to clean out the hole and remove any debris that may still be there.

4.  Segments broken and lost in the hole:

  • Cause: For a bit with brazed segments, stopping the coolant even for an instant has caused the segments to heat up and destroy the brazing.

  • Remedy: Always ensure the tool is correctly irrigated.

  • Cause: The bit has suffered some knocks in the hole (due to steel or loose debris, etc.) and these have broken the segments.

  • Remedy: Remove the bit from the machine and recover all the bits of steel, segments and debris before introducing a new bit. If any segment debris remains in the hole, there is a risk of very rapid damage to the new bit.

  • Cause: Excessive speed of rotation causes heating up of the segments.

  • Remedy: Take the tool out of service, replace or repair it if possible (consult supplier). Adjust the speed of rotation.

  • Cause: Start up too brutal.

  • Remedy: Always start drilling gently.

  • Cause: Impacts due to the equipment being dropped.

  • Remedy: Avoid dropping the bit on the ground as this can crack the segments.

5.  Core Bit jammed in the hole:

  • Cause: Debris is blocked between the core and the bit tube (steel, pieces of material); a steel bar has been drilled “banana shaped”; it has moved during drilling and jammed the bit (wedge effect).

  • Remedy: Disconnect the bit from the machine: use a spanner to turn the bit in both directions until it is released.

  • Description: http://www.gilatools.com/media/upload/image/drill_troubleshoot.jpg

  • Cause: Loss of side-clearance of segments.

  • Remedy: Check the side-clearance of the segments. If the play is too little replace the tool.