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How to Cut Concrete with an Angle Grinder?
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How to Cut Concrete with an Angle Grinder?

Views: 68     Author: Site Editor     Publish Time: 2022-06-22      Origin: Site

Almost every major construction project involves cutting concrete in some way. Concrete is used for foundations and supports and cannot be modified after it has hardened without the use of proper power tools.

One of the many tools you can use to cut concrete is an angle grinder. You can use an angle grinder with a diamond blade to cut concrete and masonry. For heavy-duty deep cuts in concrete, you should use a masonry cut off saw.

Getting Started

Before jumping into concrete cutting with an angle grinder, you will want to make sure you are set up for success. First and foremost, this includes proper safety measures. Utilizes gloves for hand protection and safety glasses for eye protection. Also, make sure your angle grinder has a functioning safety guard around the blade. If you are dry-cutting concrete, you will also need a face mask to limit your exposure to silica concrete dust.

What size angle grinder should you use for cutting concrete?

Angle grinders are meant for smaller, more detailed cuts in materials. That is why the standard size of an angle grinder is 4.5 inches in diameter. Keep in mind that while the diameter of the cutting disc is 4.5 inches, you will only get a cut about half of the distance, or 2.25 inches, minus the half of the clamping flange nut. The flange nut usually has an external diameter of 1- ½ inches. That means the cutting disc can only go around 1 inch deep into the concrete you are cutting.

How Deep Can an Angle Grinder Cut?

  • 4 ½ angle grinder you can go approximately 1 to 1 ½ inch deep

  • 9-inch angle grinder can cut to a depth of 3 to 3 ½ inches

It is certainly possible to cut through concrete up to 1-inch with a 4.5-inch angle grinder, but you might find the job gets completed quicker and with more precision with something larger like a 9-inch angle grinder.

The physical size of the angle grinder is not the only aspect to consider. The amps in the motor of the angle grinder determine how fast the grinder will cut. A 4.5-inch grinder will typically come with a 7 amp motor, while a 7 inch or 9-inch grinder will use around 13 amps. The nearly proportional amps mean each tool functions at about the same speed even though one is larger.

Which Cutting Discs are Best?

Cutting concrete with an angle grinder is always best done with a diamond saw blade. These blades are made from an engineered steel core with sharp, synthetic diamonds around the edge. Choosing a diamond blade for cutting concrete with an angle grinder is a no-brainer, but your options do not stop there.

You have a couple of options when it comes to the shape of the rim for a diamond cutting disc including:

Segmented Blade: The separation in the toothed rim allows dust to rise out of the cut and airflow to enter which cools down the blade. This blade will give a rougher cut.

Continuous Blade: For a better quality cut, a continuous rim blade is the best option. These discs are best used with wet cutting so the water will cool down the blade and remove excess dust.


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