Core Bit

Core Drill Bits – Repair, Sharpening & Tip Replacement

Core drills are available in various designs to meet the different requirements and needs of your project. They are primarily used in mining applications or to drill holes in concrete for pipes and manholes. The cylindrical core obtained is useful for sample evaluation, assessing reserves or ground investigation. Bomba Diamond Tools has been manufacturing quality core bits for customers in Toronto for over 40 years. We make sure your investment in a core drill lasts as long as possible.


Make Sure the Drill Bits Are Sharpened

Core bits are diamond-tipped to drill hard abrasive non-ferrous materials. As the bits drill through hard material such as concrete or tile, they tend to wear off. If they become less effective with use, you can get them glazed or polished. You can even replace the drill bits if they are completely worn out. You can get your drill sharpened by:

  • A Grinder – It provides a high-speed means of sharpening masonry bits. The bit is held at a 60-degree angle so that the cutting edge is parallel to the grinding wheel.
  • Drill Sharpening Machine – These have a built-in jig designed to sharpen common bit types and sizes.

How to Troubleshoot Certain Core Drill Faults

Proper maintenance is important for a long-lasting core drill bit. Extended use, poor handling or improper usage of drills can lower their lifespan. It is important to know whether the drill bit you are using is suitable for the surface to be drilled or not. Here are certain problems you might face with the core bits and the corrective measures you can try:

  • Bit Stops Drilling or Is Very Slow – This can happen if the feed pressure is high. An ammeter can help you control the speed and pressure. Aggregate that is too hard can also be the cause; use a softer bond to prevent the issue.
  • The Core Drill Fails to Cut – This may happen due to several reasons such as:
  1. Unstable or improperly fixed machine.
  2. Insufficient motor power.
  3. The diamond specification of the core drill bit is not suitable for the material to be cut.
  4. The diamond segment can become glazed. You can drill briefly on abrasive material to open-up the diamond surface.
  5. The drill slides due to excessive water flow.
  • Bent Segments – Segments can bend when the aggregate is too hard. You can use a softer bond as a solution. High feed pressure and less water flow can also bend the segments.
  • Lost Segments – The possible causes might be that you need a higher-quality bit, less water flow to the bit or an improperly anchored drill rig.
  • Excessive Tube Repair – The tube gets damaged if the core drill is not properly fitted or is operating at the wrong angle. This can also happen if debris obstructs the tool or the drill machine is damaged.
  • Excessive Tube Repair – The tube gets damaged if the core drill is not properly fitted or is operating at the wrong angle. This can also happen if debris obstructs the tool or the drill machine is damaged.
  • Core Hangs Up – If the core is stuck, there might not be enough water to remove the slurry or the core barrel may be dented. Hammering on the barrel to remove the hung up cores can result in dents.
  • Problems with Your Machine and Motor – The machine’s motor can be underpowered or the cooling system might not work properly. You can even experience issues if the carriage guides and spindle are not fitted properly.

Read our blog – ‘How to Use Diamond Core Bits on Concrete’- to learn more about long-lasting core drill bits.


If you are facing a mechanical issue with your drill, instead of buying a new one, contact our qualified professionals for core bit repairs. We can check your drilling machine and take appropriate steps to fix it. We also offer diamond blades and saw blades repair services.

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