Diamond cutting discs for cutting stone

Each stone makes different demands on a cutting disc due to its nature: It is important how hard the stone is, but also how high the proportion of abrasive components is. At bildhau you will find electroplated diamond cutting discs as well as sintered diamond cutting discs.

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Marble and limestone are mainly cut with electroplated diamond cutting discs. Sintered diamond cutting discs are suitable for sandstone and granite.

Electroplated diamond cutting discs

With electroplated diamond cutting discs, the diamond particles are on the surface of the cutting disc, which can be seen very clearly. Once the diamond particles have become blunt, they cannot be resharpened and the cut-off wheel has lost its cutting power. The advantage of electroplated diamond cutting discs, however, is that the diamond particles are much more concentrated than, for example, with sintered cutting discs, so that the removal in softer rock is much greater and faster.

Electroplated diamond cutting discs are very suitable for softer stones up to harder marble (approx. 5 on the Mohs scale) and also for some types of granite. It is important that the stones contain only small abrasive parts such as quartz, otherwise the cutting disc will quickly become blunt. Sandstone as well as very hard stone should not be cut with an electroplated diamond cutting disc if you want to protect the cutting disc and use it as long as possible.

Sintered diamond cutting discs

With sintered diamond cutting discs, the diamond particles are embedded in metal. Due to the abrasion of the metal during cutting, new diamond particles keep coming to the surface so that the cutting disc is always sharp or keeps resharpening itself, which leads to an optimal cutting result. This happens especially with medium to highly abrasive types of stone. Compared to galvanic cut-off wheels, sintered cut-off wheels contain more diamond particles, but they are distributed differently.

For cutting highly abrasive types of stone (such as sandstone), a sintered diamond cutting disc should have a much harder bond than for medium abrasive stone for a long service life. With less abrasive stone (e.g. hard marble, some types of granite, diabase), it can happen that a sintered cut-off wheel becomes blunt because the abrasion is too low and thus no new, sharp diamond particles come to the surface. It then helps to 'roughen' the surface of the cut-off wheel on a highly abrasive stone such as sandstone to restore sharpness for optimum cutting results.

Watch the cutting speed

When using cut-off wheels on an angle grinder, be sure to use the correct number of revolutions: When using cut-off wheels, speeds that are too low will leave marks; speeds that are too high can damage the tool. Therefore, pay attention to the manufacturer's specifications.

The cutting speed is given in metres per second (m/s). As the diameter increases and the number of revolutions remains the same, the cutting speed increases. This can be calculated quite easily, e.g.:

A cutting disc of 125 mm diameter has a cutting speed of (125 x 6,000)  : 20,000 = 37.5 m/s.

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