Full Line Catalog Page 409 Power Tools, Equipment, Accessories

Choosing The Right DiamonD Blade How to Choose the Right Diamond Blade BEFORE YOU GET STARTED Decide which is most important: the initial price of the blade or the cost per cut. For smaller jobs or occasional use, a low priced blade may be preferable. For larger jobs or regular use, a higher priced blade will actually be less expensive to use because it will deliver the lowest cost per cut. For really big jobs, the lowest possible sawing cost (cost per foot) is usually much more important than the initial price. KNOW THE TYPE AND HORSEPOWER OF THE SAW BEING USED Blades that are to be used on power cutters have to be rated at higher rpms. Most High-Speed Blades can be used on low horsepower walk-behind saws CORRECTLY IDENTIFY WHAT YOU ARE CUTTING Correctly identifying the material to be cut is the most important factor in choosing a blade. It directly affects the cutting speed and the life of the blade. For maximum performance (cutting speed and life), the material should be matched to the blade as closely as possible. As a general rule, determine the material which will be cut most often, or the material for which top blade performance is most important. CHOOSE WET OR DRY CUTTING Choosing wet or dry may be a matter of user preference or job requirement. When using a power hand tool such as a power hand saw, it is not safe to use water because of the electrical power source. However for concrete saws, wet cutting is usually preferred because you can cut deeper when using water as a coolant. For tile and masonry saws, either wet or dry cutting blades can be used. For power cutters, dry blades are more popular, but they are often used wet to control dust. Wet blades MUST be used with water. Dry blades may be used EITHER dry OR wet, as the job or equipment allows. THE SIGNIFICANCE OF SEGMENT HEIGHT Total segment heights may be misleading because of non- diamond bearing segment bases necessary for the laser welding or brazing process. That is why HD Supply White Cap shows you exactly how much of each segment has diamonds and can actually be used to cut. Diamond blade segment height by itself is not a true measure of a blade's value. Many other factors affect a blade's performance and consequent value. Consider the diamond size, concentration and quality, the hardness of the bond, the cutting power (torque) of the saw, and how well the blade specification is matched to the material being cut. FACTORS INVOLVING CONCRETE When cutting concrete, several factors influence which diamond blades to choose. These include: Compressive strength Steel reinforcing (rebar) Hardness of the aggregate Green or cured concrete Size of the aggregate Abrasivity of the aggregate Type of sand The guidelines in this section are for general reference only. The best source for information on the characteristics of the concrete to cut is from the original contractor. Contact your local Department of Transportation or City Hall for help in finding this information. COMPRESSIVE STRENGTH Concrete slabs may vary greatly in compressive strength, measured in pounds per square inch (PSI). Most concrete roads are 4,000- 6,000 PSI, while typical patios or sidewalks are about 3,000 PSI. SIZE OF THE AGGREGATE The size of aggregate affects diamond blade performance. Large aggregates tend to make a blade cut slower. Smaller aggregates tend to make a blade cut faster. HARDNESS OF THE AGGREGATE There are many different types of rock used as aggregate. Hardness often varies even within the same classification of rock. For example, granite varies in hardness and friability. Also see page 363 for a general aggregate hardness map. STEEL REBAR REINFORCING Heavy steel reinforcing tends to make a blade cut slower. Less reinforcing tends to make a blade cut faster. Light to heavy rebar is a very subjective term. GREEN OR CURED CONCRETE The drying or cured time of concrete greatly affects how the material will interact with a diamond blade. Green concrete is freshly poured concrete that has set up but is not yet fully cured. It is softer and more abrasive than cured concrete. You need a harder bonded blade with undercut protection to cut green concrete. You need a softer bonded blade to cut the same concrete in a cured state. The definition of green concrete can vary widely. Weather, temperature, moisture in the aggregate, time of year and the amount of water in the mix all influence curing time. Concrete now has additives which can either shorten or extend curing time. Consult your mix design to find the relative curing time for your job. As soon as wet concrete sets up and does not spall or ravel, green cutting can begin. WhiteCap.com 409 VISIT US ONLINE g

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