All You Need To Know About Core Drilling

about core drilling

In the world of construction, there are many instruments being used for various functions nowadays. Think about the different tools used for cutting, drilling, boring, plastering, holding-in-place and likes. Amongst these equipment mentioned above is the core driller.

A core driller is a machine or equipment which is equipped with special types and grades of drill bits essential for drilling holes of large or small diameters in already constructed structures. A major use of the core drilling is in the construction of manholes for sewer outlets and fitting pipes in buildings.

It is reasonable to have questions about what core drilling really is to get more familiar with the concept. If you need answers to these questions, ensure you reach the end of this post as it provides answers to every question you have in mind about core drilling.

Question number one: What is core drilling really all about?

Core drilling, in general, is the process of creating a hole or penetrating through concrete, CMU (concrete masonry unit), brick or stone using a diamond or carbide-tipped drill bit. This is usually used in the construction industry so things can be fitted inside the holes drilled. Core drilling also is used for exploration in mining and all related engineering fields.

You should also know that the drill samples (a piece of concrete inside the drill) is first sent to geological experts for their analysis of the samples. They make the decision whether or not the area should be used for further construction work or should be abandoned.

Question number two: Are there any types of core drilling?

Of course, there are. Below are the principal types of core drilling:

Diamond core drilling: Diamond core drilling comes from the diamonds used to make the drill bits. The drill bit is made of small industrial-grade diamonds arranged into a soft matrix. You should take note that the more you use your drill, the more the diamonds on the tip get exposed to contact.

Reverse circulation drilling: Reverse circulation drilling has a lot of advantages over the other types of drilling methods. It uses dual wall drill rods that consist of an outer rod with an inner tube. The inner tubes allow the drill cuttings to be transported back to the surface steadily.

Question number three: What are the precautions to take when core drilling?

During core drilling, there are some safety procedures you should get accustomed to as operating a core driller is a dangerous job to do. Here are some precautions you should take when core drilling.

  • Never take alcohol or enhancement drugs before using the core driller.
  • Ensure you have your PPE (Personal Protective Equipment) when using the core driller.
  • DO NOT make any adjustments while the machine is operating.
  • Avoid cleaning chips with your hands. It is advisable to use a brush.
  • Remove all chuck keys and wrenches before operating the drills.
  • Ensure the cutting tools are running straight before starting the operation.
  • DO NOT place tools or equipment on the drilling table.

Following all these procedures while operating them should keep accidents and injury at bay.

Question number four: What are the Advantages and disadvantages of core drilling?


  • Core drilling is way faster and efficient.
  • It requires fewer labour hours to get the job done.
  • You spend less while operating core drills.
  • Core drilling cuts more precise holes when compared to other drilling methods.
  • You get to make holes once thought impossible.
  • You don’t have to worry too much about the cooling system as the machine design has got this covered for you.
  • They save a lot of energy during cutting. This can be traced to the fact that they require less thrust to drill when compared to the other drilling categories.
  • They are also easy to sharpen.
  • Core drill bits have a range of diameter sizes.


  • Taking cores always leave weak points within the element. This can affect the integrity of structure and durability performance.
  • Coring can damage the structural performance of the element, especially if the coring damages the rebar. This is the last you want during coring.
  • Getting core locations can be very subjective. There are just too many things to put into consideration.

Question number five: Who is certified to use a core drill?

An engineer with the appropriate licenses.

Question number six: What is the importance of core drilling?

  • One of the most important aims of core drilling is for the collection of samples of what was removed from the site. Other importances are:
  • It helps geologists evaluate properties of the land they are to build on. This is important for evaluating the best design for a particular place.
  • It helps engineers and construction workers make accurate holes for proper installation of building components.
  • It is used in the preliminary construction of manholes, ducts, anchor installations and so on and so forth.
  • Owing to the fact that they don’t do too much damage to the overall structure, they are used well in renovation projects.

You as a core driller should get used to the props of the core driller. Do not forget to practice proper maintenance of your core drills. Here are some maintenance tips for keeping your core drills.

  • Make sure your bit is well sharpened.
  • Do not realign the drill once the hole has been started.

Know your equipment.

Apart from these, if required, you should take help of a professional company of core drilling services to avoid the injuries, mistakes, and other factors.

Published by Hard Cut Concrete Sawing & Drilling

Hard Cut Concrete Sawing & Drilling we specialise in professional concrete cutting, drilling and grinding for all residential, commercial, industrial needs. We are committed to serve our clients with fast and efficient concrete cutting and core drilling. With over 17 years’ of experience in the industry, Hard Cut Concrete Sawing & Drilling has the knowledge and skills to provide you with superior workmanship and service.

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