When choosing the right diamond blade what is the most important factor? The cost per cut or the price of the blade? A low priced blade of Trade quality may be preferred if the job is small or the use is occasional. A higher priced blade will be less expensive for larger jobs or more regular use because it will be delivering a lower cost per cut. Recommended are Professional quality or Contract quality.
For much bigger jobs the lowest cutting cost per inch/foot is much more important than the initial cost. We recommend choosing Specialist quality.
Edge Diamond has a grading system to help identify the the varying performances of the blades.
Type and horsepower of the saw
What kind of saw, grinder, what horsepower is being used? What is the RPM? Floor grinder, right angle grinder, small power hand saw, high speed saw, concrete saw and masonry saw? For the best results from blade and saw, blades should be matched with the saw and horsepower. Manufacturers of Diamond blades design products to be run at specific speeds. Blades used on high speed cut-off saws have to be rated at higher RPMs.
All Edge Diamond high speed handheld saw blades are rated at the appropriate, higher RPMs.
Material to be cut
A very important factor in choosing blades is correctly identifying the material to be cut. This directly affects the life of the blade and the cutting speed.
Nearly all materials fall into the following catagories: soft, medium soft, medium hard, and hard. An example of this would be in masonry, hard would be granite or quarry tile. In concrete it would be cured concrete with a hard aggregate. Soft would cover light weight block or asphalt.
Choose a softer bond when cutting hard materials. The softer bond will release the diamond chips at the point of maximum utilisation, without danger of holding the diamond long enough to be overexposed to heat at the cutting point. If the overexposed diamond is not sloughed off, it will in time stop cutting and glaze over. The glazed-over surface will stop the entire sloughing off process and the blade will stop cutting, due to there being no new diamond chips being exposed at the cutting edge. This would render the diamond blade useless.
Select a harder bond that will hold the diamond chips longer so as to be more productive when cutting soft materials. If you use a soft concrete with a soft bond, the bonding matrix will prematurely release the diamond chips before they have reached maximum utilisation therefore the good diamond chips will be lost very early on. The blade will still cut adequately but productivity will be poor.
Consideration must be given to the amount and size of steel reinforcing as blades have low efficiency in cutting steel bar.
The majority of diamond blades cut a range of materials for maximum performance in both cutting and life. The material should be matched to the blade as closely as possible. A general rule would be to determine the material which will be cut most often, or the material for which blade performance is most important.
Wet or dry cutting
Choosing wet or dry cutting may be a matter of user preference or job requirement.
If you use a power hand saw, due to the electricity it is not safe to use with water. For concrete saws, wet cutting is usually preferred as the water acts as a coolant and you can cut deeper. Both wet or dry cutting can be used for tile and masonry saws. Dry blades are more popular for high speed hand held saws, but they are often used on wet to control the dust.
Water must be used with wet blades. Dry blades can be used in either condition.
Importance of segment height
Segment heights may be misleading due to non-diamond bearing segment bases that are necessary for the laser welding or brazing processes. The higher segment lasts longer. When wanting to save the total cost for larger jobs you would choose a longer segment height. You can choose proper segment height according to the job size.
Variables affect performance
There are factors that affect the blades performance and value. Consider the diamond size, concentration and quality, the hardness of the bond, the cutting power of the saw, and how well the blade specification is matched to the material being cut.