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Technical Article

How to Select Diamond Grinding Cup Wheels for Concrete

Grinding concrete floor with the diamond grinding cup wheels have many advantages. They are fast, low-noise and low-cost. They are very popular in the construction and home improvement industry. Diamond grinding cup wheels are the diamond grinding tool which is often used to grind concrete, stone and masonry materials.

When deciding what kinds of diamond grinding cup wheel should be adopted in your application, you should check the hardness and structure of the concrete (or nature stone floor) you are going to grind. If the concrete is hard, the bond of the diamond grinding cup wheel should be softer. Because diamonds are easy to wear out during grinding hard concrete. The soft bond can be worn down easy which make the new diamonds exposed, and makes new diamonds beneath be more easily exposed to participate in cutting the hard concrete. If the concrete is relatively softer, the metal bond should be harder. for diamonds can last longer when grinding softer concrete. The harder bond wears slower, so that it can hold the diamonds longer. This can make better use of the diamonds and prolong the diamond grinding cup wheel’s service life.

There are normally two phases in concrete and stone grinding. The first is coarse grinding and the second is fine grinding. The two phases need also different diamond grinding cup wheels which adopt different sizes diamonds.

For coarse grinding, the bond should be softer and the diamond toughness should be higher, because in this case the diamonds are more easily to become blunt. The diamond grit should be bigger, normally from 35 grit to 50 grit. For this is coarse grinding and big grit can improve working efficiency. The diamond concentration can be lower.

For fine grinding or polishing, the bond should be harder and the diamond toughness can be lower, for in this case the diamonds can last longer and hard bond can also help the precision of the processing. The diamond grit is normally between 80 grit to 120 grit, depending on practical requirements. The diamond concentration should be higher.


The production method of cup wheels can be whole sintering or welding. The whole sintering cup wheels are sharp, but the longevity is relatively short. The welded cup wheels have long lifespan, however the price is a bit high. Usually we think the quality of welded cup wheel is better than whole sintering cup wheel.


Mastercut customized diamond grinding cup wheels of all kinds of shape and grit. There are soft bond and hard bond for the diamond segments, our engineer will adopt the most suitable formula according to the grinding object.


Please inform Mastercut the following information before buying diamond grinding cup wheels:

1. grinding object;

2. the grit of diamond(or coarse, medium and fine grinding);

3. the shape, size and quantity of the grinding wheel;

4. the quality grade or the production method;

5. drawing or sketch required for special shapes.

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