Diamond Blade Select

We Launched a Construction Directory

Hanjiang Wang — Mon, 10 Oct 2011 08:26:26 +0000

Recently, we launched a construction directory to include good websites and web pages relating to the construction, building, and home improvement industries. The criterion that we choose the sites and pages into this directory is that they should have useful and informative contents. If you have or find good sites or pages relating to these industries, welcome to inform us by leaving a comment to this post, and we will see if we can include them in this directory.

How to Cut Concrete

Hanjiang Wang — Sat, 30 Jul 2011 08:58:24 +0000

Concrete is usually cut with diamond blades. There are different solutions to perform concrete cutting under different circumstances.

If the job is of shallow cutting and small scale

In this case, you can use a 4″ or 5″ angle grinder, and a 4″ or 5″ sintered diamond blade, for example, segmented diamond blade, turbo diamond blade, or turbo wave diamond blade, mounted on the grinder. Segmented diamond blades may cause more chips during the cutting due to their segmented rim, but they are cheaper. Turbo wave diamond blades can be used to perform higher load tasks for their strengthened steel core, but their price is the highest in these 3 kinds of sintered diamond blades.

You can first cut the concrete to 1/4″ deep, and see how the angle grinder and the diamond blade respond. If no problem, you can do further passes of cuttings to reach the depth of the cut you need. Each cutting pass should not be deeper than 1/2″.

To reduce the dust, you can ask someone to spray some water onto the diamond blade and the cut during the cutting process. This can also help to cool the diamond blade and extend its life. If it is not safe to use water for the electric power source of your angle grinder, you should cut the concrete dry. As dry cutting uses the air as the coolant, after a period of cutting you should release the pressure on the diamond blade and allow it to rotate freely to let the air cool it. The period can be a few minutes to a few seconds depending on the hardness of the concrete being cut (the harder the concrete, the shorter the cutting period should be).

Throughout the cutting process, you should wear a professional respirator, for the dust can seriously hurt your health.

In addition to angle grinder, you can use a circular saw to do the job. Circular saws have a baseplate which can help to keep the cut straight and uniform. With a circular saw, you can also use a bigger diamond blade, e.g., 7″, to improve the cutting efficiency, for circular saws are stabler.

If the job is of deep cutting or big scale

If your cutting is deeper than 4″ (about 100mm) or the job scale is fairly big, you should use a wet concrete saw and laser welded diamond concrete saw blades to do the job. The concrete saw can be a handheld cut-off saw, a walk behind saw, or another type. The diameter of the laser welded diamond blade is usually no smaller than 12″ (300mm). The concrete saw and the diamond blades can be either bought or rented. To obtain good cutting result and improve cutting efficiency, you can follow below steps to prepare the concrete cutting:

1. Identify what concrete you will cut

There are many types of concrete, and they should be cut with different types of diamond blades.

Some concrete has steel bars (reinforced concrete). If your cutting depth is about 4″ or deeper, you may meet the steel bars halfway. There are diamond blades specially for cutting reinforced concrete.

The curing time of concrete varies. Fresh (green) concrete is more abrasive, and old (cured) concrete is harder. Diamond blades for cutting green concrete and cured concrete are also designed to be different.

If possible, you can further investigate the aggregate and the sand of the concrete, for these information can help you to choose the more suitable diamond blades. Hard aggregate like basalt and quartz dulls the diamonds on the blade faster, so the blade’s bond should be softer to let new diamonds be exposed more easily. The size of the aggregate also affects how hard the blade’s bond should be. Small aggregate (smaller than 3/8″) wears the blade faster than big aggregate (bigger than 3/4″). The type of the sand affects the concrete’s abrasiveness. Sharp sand such as crushed sand and river bank sand is more abrasive than round sand like river sand.

2. Choose the proper diamond blades

Though silver brazed diamond blades were used widely in wet concrete cutting before, now laser welded diamond blades are more common for their firm laser weld and high performance.

You should check what diameters of diamond blades your concrete saw can accommodate, and the saw’s arbor size which the arbor hole on the diamond blade should match. Also, you should examine the horsepower of the concrete saw. The saw’s horsepower affects the diamond blade selecting. Diamond blades used on big horsepower saws should have harder bond or higher diamond concentration, otherwise the blade may be consumed very quickly.

Then, you can tell the diamond blade’s diameter and arbor hole size, the horsepower of your concrete saw, along with all the detailed information of the concrete you get in the first step to your diamond blade supplier. The supplier should know which kind of diamond blade may fit your job.

3. Determine wet cutting or dry cutting

Concrete is usually cut with water (wet cutting), for cutting concrete with adequate water can significantly reduce the dust, keep the diamond blade cool and extend its life, and improve the cutting efficiency (for wet cutting can be deep and continuous).

However, when there is no water source near the work area, you have to perform dry cutting. As said in the previous section, dry cutting should be intermittent and shallow. If deep cutting is needed, you should do several passes of shallow cuttings.

4. Wear enough personal protective equipment

You should at least wear a professional respirator, not only in dry cutting, but also in wet cutting, because the small dust particles generated in the concrete cutting process can penetrate deep into the lungs and can cause serious health effects such as lung cancer or silicosis. If the job is big, other equipment like goggle, earplugs, and protective clothing should also be adopted.

5. Pre-cut a shallow straight line on the concrete

To make the cut straight, you can use a chalk line to mark a straight line on the concrete, and then place a straight wood board along the line. Then you can cut a shallow line on the concrete along the wood board. The cut can be about 1/4″ deep.

Having this shallow straight cut, you can perform further cuttings along it to gain the cut you need.

More tips for concrete cutting

Concrete can also be cut with abrasive blades, but diamond blades are recommended, for diamond blades can provide at least two times faster cutting, less downtime, and constant depth of cuts.
If you use the diamond blades occasionally and your jobs are small, you can choose the economical grade diamond blades to save your expense (but the cutting speed of the economical diamond blades should be fast enough). If you use the diamond blades frequently or the job is big, you should choose high grade professional diamond blades, for this can decrease your cost per cut.
If you are not sure that you can do the concrete cutting job well, you can just hire a professional concrete cutting company to do the job for you.

8 Easy Tips for Buying the Right Diamond Blades You Need

Hanjiang Wang — Thu, 30 Jun 2011 03:51:14 +0000

Do you know high quality diamond blades may not work well for your job? This is true. Your diamond blades should fit your application. Here we give 8 easy tips you can use when you are buying diamond saw blades.

1. What material you want to cut

Diamond blades can be manufactured to be very different for cutting different types of materials. So tell your supplier the material you want to cut, e.g., reinforced concrete, concrete road, asphalt, granite, marble, bricks, or ceramic tiles. The more detailed is the information about the material, the better. For examples, you can tell your supplier the diameter of the steel bars in the reinforced concrete, the aggregate of the concrete, whether it is a green concrete or cured concrete, how hard your marble is, and so on.

2. Wet cutting or dry cutting

If you use a wet diamond blade in dry cutting, it may take just a few seconds for the blade to be damaged, and even worse, this may cause serious security issues. Wet diamond blades and dry diamond blades are designed to be different. So always tell your supplier this information. Concrete saw blades are usually designed for wet cutting.

3. Professional use or DIY use

Professional diamond blades are usually for frequent uses, so cost per unit of cutting length is more important than the blades’ unit price. High quality long-life diamond blades are more cost-effective for professional use though their unit prices are higher.

DIY diamond blades, however, are often for small jobs and occasional use. Their lifespan need not be very long, so cheaper diamond blades with shorter lifespan are an economical choice for DIY jobs. But the cutting speed of DIY diamond blades should be acceptable.

Therefore, letting your supplier know whether the blades are for professional use or DIY use can save your expenses.

4. The horsepower of the saw machine on which the diamond blades will be used

Diamond blades used on big horsepower saw and small horsepower saw are also designed to be different. During the cutting process, big horsepower saw exerts bigger torque on the diamond blade and the blade’s segments receive bigger impact. In this case, the segments’ diamond concentration should be higher to decrease the impact on single diamonds or their bond should be harder to hold the diamonds more firmly. If you use a diamond blade that fits small horsepower saws on a big horsepower saw, the diamond blade may be consumed very quickly. On the contrary, if you use a big horsepower saw blade on a small horsepower saw, the blade may cut slowly or even does not cut because of its high diamond concentration or hard bond. So tell your supplier the horsepower of your saw, and he should know what diamond blades may fit your needs.

5. Make sure the diameter of the diamond blades and their arbor hole size

The diameter of the diamond blades and their arbor hole size should match your saw machine.

6. The segment height

Diamond blades with higher segments will have a longer lifespan. However, the segments cannot be too high. Because during the cutting, higher segments will make the joints (e.g., welds) that connect the segments to the blade’s steel core bear bigger torque. If the joints or welds fail to withstand the torque, one or more segments may break off the blade and may fly out, and may hurt the people nearby. The common segment height of 14″ diamond blades is 10mm or 12mm.

7. The segment thickness

Normally, you do not need to tell your supplier the thickness of the segments. There are default segment thicknesses for different diameters of diamond blades. But if you want to further improve the cutting speed of the diamond blades, you can ask your supplier to make the segments thinner. This often needs the steel core to be made thinner also.

8. Find a good supplier

Finding an honest and reliable supplier is very important. A good supplier can suggest which type of diamond blade can fit your application, and provide you with good products.

Why the Segment of Diamond Blades Can Break Off

Hanjiang Wang — Mon, 13 Jun 2011 02:52:15 +0000

A common problem diamond blade users may encounter is that one (or more) segment break off the diamond blade. This problem is often known as segment loss, which not only means the damage of the diamond blade, but may cause serious security issues because of the segment flying out.

A laser welded diamond blade with a segment lost

The reasons of segment loss (break) of diamond blades are diverse. If diamond saw blades has no problem in quality and the segments are connected to the blade’s steel core firmly, the following causes may lead to segment loss:

1. Wet diamond blades are used with inadequate water or even dry

During the cutting process, if there is no adequate water flowing on both sides of the diamond blade and in the cut, excessive heat may be generated and there may be some abrasive slurry remaining in the cut.

If the wet diamond blade is laser welded, the abrasive slurry can wear away the blade’s steel core just beneath the segment. This problem is often called undercutting. Serious undercutting can cause the segment to break from the steel core.

If the wet diamond blade is silver brazed, the excessive heat can cause the silver solder which connects the segments to the steel core to be melted, and then the segments may break off.

So adequate water is critical to the wet cutting job, for it can avoid overheating of the diamond blade and can wash out the abrasive slurry. Overheating can also make the diamonds on the segments become blunt. If a wet diamond blade is used without any water (dry), it may take just a few seconds for the blade to be damaged.

2. Dry diamond blades are not used properly

Laser welded diamond blades can be designed to cut some materials without water. However, if dry laser welded diamond blades are used dry arbitrarily, the segment may still break off the diamond blade.

As dry cutting utilizes the air as its coolant, dry diamond blades should be used in the intermittent and shallow sawing mode to allow the air to flow around the blades to dissipate the heat. You can read our how to use diamond blades in dry cutting article for more information. If a dry diamond blade is used in continuous or deep cutting, the blade may be overheated and may lose its segments.

Not all materials can be cut dry. Some very hard materials, e.g., concrete with strong reinforcement, should still be cut with water. Wet cutting can improve cutting efficiency, control dust, and extend the diamond blade’s life.

3. Problems related with the saw machine

If the saw machine’s blade shaft or shaft bearings are worn, the diamond blade may jump up and down in the cutting process. This can lead to segment loss. Replacing the shaft or shaft bearings can resolve the problem.

Some other reasons can also make the diamond blade flutter and then cause segment loss. These reasons include: the diamond blade is mounted on the shaft incorrectly; the nuts or bolts which hold the flange and blade shaft together are not wrenched tight; there is dirt, sand or other materials between the blade steel core and the flange.

4. The material being cut slips and jams the diamond blade

This situation is typically seen in masonry or tile sawing applications and may cause segment loss. To avoid this, the operator should make sure that the material is seated securely on the saw machine, and that he holds the material firmly through his entire cutting process.

How to Use Diamond Blades in Dry Cutting

Hanjiang Wang — Mon, 30 May 2011 03:24:32 +0000

Normally, using diamond saw blades with adequate water (wet cutting) can extend the blades’ life and control dust. However, in some situations, dry cutting should or has to be performed. These situations include:

For some electrical power tools, it is not safe to use water because of the electrical power source.
The work area needs to be kept dry.
Water source is not available near the work area.

1. Choose proper dry-use diamond blades

If you need to perform dry cutting, you should first choose the proper diamond blade which can be used dry. Diamond blades for dry use are normally different from the ones only for wet use. For sintered diamond blades, continuous rim diamond blades are usually only for wet cutting. Most of other sintered diamond blades can be used dry. For welded diamond blades, silver brazed diamond blades cannot be used in dry cutting, while dry-use laser welded diamond blades can. You can read our diamond saw blades introduction article for more information. Dry-use laser welded diamond blades are designed different from the laser welded diamond blades that are only for wet use.

Dry diamond blades usually can be used wet. But if a wet diamond blade is used with inadequate water or even dry, the diamond blade may be overheated and damaged, and even worse, the segment on the blade may break and fly out, and may hurt the operator or the people nearby.

So tell your diamond blade supplier that you need dry cutting, and let him/her choose proper dry diamond blades for you.

2. Operate dry diamond blades properly

After obtaining a right diamond blade for dry use, if the operator fails to operate properly, the excessive heat generated in the dry cutting process may still damage the diamond blade, and the operation can be very dangerous.

Unlike wet cutting using water as the coolant, dry cutting uses air to cool the diamond blade. During dry cutting, the operator should perform intermittent and shallow cuttings to allow the air to flow around the diamond blade.

Intermittent Cutting: The operator should not do long time continuous dry cuttings. Instead, after some time of dry cutting, he should take the pressure off the diamond blade, and let the blade run freely and to its full speed to allow the air to keep it cool. The duration of each dry cutting operation can be a few minutes to a few seconds depending on the hardness of the material being cut. The harder the material, the more often the diamond blade should be allowed to cool.
Shallow Cutting: The operator should also perform shallow cuttings to avoid the diamond blade’s overheating. When deep cut is needed, he can do several passes of shallow cuttings (step cut) to achieve it.
Do not force diamond blade into the material: The operator should allow the diamond blade to cut at its own speed. Forcing the blade may cause overheating and blade damage.

More information, if you experience problems with wobbling when performing dry cutting with a high-power handheld saw machine, try wet cutting. This can cool down the diamond blade and solve the problem. Not all materials can be cut dry. Very hard materials, for example, concrete with strong reinforcement, should still be cut with adequate cooling water. For concrete saws, wet cutting is preferable as it allows continuous and deeper cuttings, reduces the dust, and can prolong the diamond blade’s life.

Basic Properties of Diamond

Hanjiang Wang — Tue, 12 Apr 2011 05:59:20 +0000

Diamond can be either natural or synthetic, and has the following basic properties:

		Description
Mechanical Properties	Hardness	Diamond is almost the hardest material on the earth. On the Mohs scale of mineral hardness, its hardness is 10 — the hardest. Its microhardness is about 100000 MPa. Its Rockwell hardness is about 1.56 times of CBN’s, 3.7 times of tungsten carbide’s, 4.4 times of corundum’s and 8.5 times of quartz’. Diamond’s hardness is different on its different orientations (crystal planes). Because of its very high hardness, diamond can be used to make various diamond tools such as diamond saw blades, diamond core drill bits, diamond cup wheels and diamond polishing pads, to cut, grind or polish hard or abrasive materials, e.g., stone, concrete, asphalt, ceramics, bricks and carbide alloy.
	Brittleness	Though diamond is very hard, it is relatively brittle. It splits along its crystal cleavage planes when receiving a certain impact. The brittleness of diamond is also related to its crystal completeness. Crystal defects can generate internal stress and even lead to natural split. While complete crystal has a fairly high toughness and its split pressure can reach 30 – 100 MPa. So “impact toughness” is one of the main indexes to measure the quality of industrial diamonds.
	Density	The density of diamond is normally 3.47 – 3.56 g/cm³. Pure and complete-crystal diamond’s density is 3.52 g/cm³.
	Cleavage	The cleavage of diamond happens most likely along the <111> plane (a triangle that consists of the three diagonals of the three adjacent planes of a cubic diamond lattice).
	Fracture	The fracture surface of diamond can have a complex structure, and is often conchoidal or irregular-shaped.
Optical Properties	Color	Pure diamond has no color, but it is fairly rare. The color of diamond is often yellow, green, brown, rose, blue, grey and black. This is related with the impurities it contains and its crystal defects.
	Luster	Diamond often has the so-called “diamond gloss”, which means quite strong reflected light, shining but not metallic. A few diamonds have oil sheen, glass gloss or even no luster, which is usually caused by long-term chemical corrosion, radiation effects, invasive alien substances or other materials coated on their surface.
	Transparency	Pure diamond is transparent, and impure diamond can be translucent or even opaque.
	Refractive index	Pure diamond’s refractive index is 2.40 – 2.48, which is the highest in transparent minerals. The higher refractive index, the higher reflectivity. Diamonds that are specially designed and processed can reflect almost all the light that comes to their sides and interior.
	Dispersion	Diamond’s dispersion coefficient is 0.063, which is also the biggest in transparent minerals. The bigger dispersion coefficient, the better spectroscopy result. When a white light comes into a well-cut diamond, the light can be split into different colors of light because of the diamond’s dispersion effect, and the diamond looks dazzling.
	Luminescence	Diamond can shine distinct green, sky-blue or blue fluorescence under cathode ray, medium-brightness or weak sky-blue fluorescence under X-ray, distinct or medium-brightness sky-blue, purple or yellow-green fluorescence under ultraviolet, and light green-blue phosphorescence in darkroom after exposure under sunlight.
Thermal Properties	Thermal conductivity	Diamond is a good heat conductor. Different types of diamonds have different thermal conductivity. Some diamonds have super thermal conductivity.
	Thermal expansion	Diamond’s thermal expansion coefficient is very small at low temperature, but increases rapidly with the rising of temperature.
	Heat resistance	Diamond’s ignition point is 720 – 800 °C in oxygen and 850 – 1000 °C in air. The flame is blue when diamond is burning.
Electromagnetic Properties	Magnetism	Pure diamond is not magnetic. But as containing impurities of catalyst alloy, e.g., Ni, Co, Fe, Mn, Cr, synthetic diamond is magnetic. The more catalyst impurities, the more magnetic the synthetic diamond is. Low magnetism indicates the diamond’s good crystal and its good quality.
	Electrical conductivity	Normally, diamond is a poor electrical conductor. Its electrical conductivity increases when temperature rises. Some diamonds are good semiconductor.
	Photoconductivity	When diamond is irradiated by ultraviolet of 2.1 x 10^-4 – 3.0 x 10^-4 mm wavelength, there are photocurrents generated in the diamond.
	Triboelectricity	When diamond rubs on the surface of glass, hard rubber or plexiglass, positive charge can be produced on the diamond.
Surface Properties	Lipophilicity & Hydrophobicity	Diamond cannot be wet by water, but can be easily wet and stuck by oil. This property can be utilized to extract diamonds using oil when making synthetic diamonds.
Chemical Properties	Chemical stability	Diamond has very good chemical stability. It does not react with acid and alkali under room temperature. Its surface can only be oxidized a little by just a few oxidants under high temperature (below 1000 °C). So acid and alkali can be used to refine synthetic diamonds.

Types of Saw Blades

Hanjiang Wang — Tue, 19 Oct 2010 08:39:46 +0000

Perhaps the often sighted saw blade is a long steel plate with many saw teeth on one side to saw wood. Actually, besides this traditional woodworking saw blades, there are wide categories of saw blades for various uses. Just say the saw blades’ shape, the base of a saw blade can be a long steel plate, a circular blade, a closed steel band, a thin wire, or of other shapes. The blade’s teeth are often designed to have many styles to fit the needs of cutting different types of objects. Saw blades can also have no teeth but have just a continuous cutting edge.

From the perspective of the material used to make the saw blade, there are common steel saw blades, High Speed Steel (HSS) saw blades, carbide tipped saw blades, solid carbide saw blades, diamond saw blades, etc. Here we say some of them in more detail.

1. High Speed Steel (HSS) Saw Blades

The whole saw blade is made of High Speed Steel (HSS). HSS saw blades are mainly used to cut steel, copper, aluminum and other metal materials. They can also cut non-metallic materials. The grade of HSS greatly influences the performance of the saw blade. HSS saw blades of higher grade HSS have a higher hardness in high temperatures, and often have a longer lifespan. If stainless steel or other high-strength steels is to be cut, HSS saw blades made of cobalt HSS (e.g. M35, M42) should be used, for cobalt can increase the HSS material’s capability to keep its high hardness under the high temperature generated in cutting these high-strength steels.

2. Carbide Tipped Saw Blades

Each of this saw blade’s steel teeth is tipped (via welding) with a small piece of sharp tungsten carbide block. This type of blade is also called TCT (Tungsten Carbide Tipped) saw blade. Carbide tipped saw blades are widely used to cut wood, plywood, laminated board, plastic, grass, aluminum and some other metals. The performance of the blade is greatly influenced by the quality of the small carbide blocks tipped and the number of its teeth, and is also influenced by the quality of the blade’s steel body.

3. Solid Carbide Saw Blades

The whole saw blade is made of tungsten carbide. Comparing with HSS saw blades, solid carbide saw blades have higher hardness under high temperatures, and are more durable, so they have replaced HSS saw blades in many fields. However, the toughness of tungsten carbide is lower than HSS’, so solid carbide blades’ cutting edge can be chipped when the cutting parameters are not proper or the machine is not very precise.

4. Diamond Saw Blades

This type of saw blade has small-sized industrial diamonds (synthetic or natural) fixed on its base to utilize the diamonds to cut (actually grind) hard and brittle, or abrasive materials. As diamond is almost the hardest material on the earth, diamond saw blades can easily cut stone, concrete, asphalt, bricks, glass, ceramics, semiconductor materials, gem stone, etc. The methods by which diamonds are fixed onto the base of the blade include metal bonding, electroplating, vacuum brazing, etc. There are many types of diamond saw blades that are used in various fields.

3 Main Criteria for Evaluating a Diamond Saw Blade’s Performance

Hanjiang Wang — Tue, 27 Jul 2010 09:07:25 +0000

There are 3 main criteria when evaluating the performance of a diamond saw blade: cutting efficiency, service life and processing quality.

Cutting Efficiency is normally expressed as how much area the diamond saw blade can cut in unit time. It indicates the sharpness of the blade. This is the criterion that users should first consider. The blade’s sharpness should meet the user’s cutting efficiency requirement. Generally, using coarser diamond grit or/and lower diamond concentration can improve the sharpness of the blade.

Service Life is normally measured with the total area the diamond blade can cut. When a certain specification of material is cut, this criterion can be also expressed how long the blade can cut. It indicates the durability of the blade. When the user is satisfied with the blade’s cutting efficiency, its service life should then be paid attention to. Generally, adopting higher diamond concentration or/and finer diamond grit can prolong the blade’s service life.

Processing Quality here means the quality of the cuts which the diamond blade makes on the material. This criterion mainly includes the flatness and roughness of the cut surface, the parallelism of the two sides of the cut, and the integrity of the edges.

Diamond Grit’s Influence on the Performance of Diamond Saw Blades

Hanjiang Wang — Mon, 19 Jul 2010 10:15:32 +0000

Diamond grit indicates the size of the diamond. The diamond’s protrusion height on the cutting surface of the diamond saw blade influences how deep the diamond can cut, while deeper cutting means higher cutting efficiency. If the diamond is big, its exposed portion can be higher, so its cutting efficiency can also be higher. Therefore coarser diamond grit leads to higher cutting efficiency of the diamond saw blade.

Diamond grit determines the number of diamonds per carat. The finer is the grit, the more diamonds are there per carat. When the diamond concentration is certain, finer grit means more diamonds on the cutting surface of the diamond blade. So finer grit can improve the blade’s service life, but will also increase the power consumption of the saw machine.

Coarse diamond grit is suitable for cutting soft materials, and fine diamond grit is suitable for hard materials, because smaller diamonds are more easily to cut into hard materials.

Diamond Concentration’s Influence on the Performance of Diamond Saw Blades

Hanjiang Wang — Sat, 17 Jul 2010 10:12:07 +0000

The meaning of a diamond tool’s diamond concentration is the weight of the diamonds in a unit volume of the diamond tool’s working layer, and it is defined that when each cubic centimeter contains 0.88g diamonds, the concentration is 100%. This definition also applies to CBN abrasives.

Diamond concentration greatly influences the performance of a diamond saw blade. If the concentration is too low or too high, the ideal cutting result will not be got. The commonly adopted concentration is between 25% and 75%. Generally, when the concentration increases, the diamond blade’s sharpness and cutting efficiency drop, while its service life increases. So when high cutting efficiency is required and the cutting roughness requirement is not high, diamond blades with low diamond concentration and coarse diamond grit are popular.

Diamond concentration also influences the power consumption of the saw machine. When the concentration increases, the power consumption also increases.