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Category Construction Glossary
Construction Dictionary
Construction Articles
Knowing what factors that can affect your concrete cutting
performance is the first step.

Understanding your Aggregate and choosing the right diamond
blade  for what you’re cutting.    

Hard aggregates such as river rock require diamond blade with a
softer bond. Meaning the metals holding the diamonds are softer
allowing the diamonds to grind down and break away when they’re
done cutting. You should cut at slower speeds when the aggregate
is hard.

Soft aggregates require diamond blades made with a harder bond,
where the metals hold the diamonds tighter and the soft aggregate
assist in the grinding of the diamonds. Cutting at faster speeds is
advisable when cutting soft aggregates.  

Of course reinforcing steel can decrease your cutting rate and
shorten your blade life. When cutting through steel try reducing
blade speed, decrease your water flow, and apply more pressure.
Never bounce the blade up and down – diamonds don’t like
impact.  Operating your diamond blade at the right speed can also
affect performance. Speed will have to be adjusted based on the
type of aggregate or the amount of steel you encounter. You
should never operate a blade above the recommended RPM
stamped on the blade. Serious injury could occur! Blade cores are
tensioned at a prescribed RPM.

Depth of cut can drastically affect the life of your blades. Plunging
all the way to full depth increasing blade contact will wear your
blades out prematurely. Step cutting is advisable to prolong blade
life. Make one pass at a speed of 8 to 10 feet per minute allowing
just enough contact and maintaining RPMs. Make repeated
passes until you’re all the way through. Careful not to cut down to
deep into the sub base introducing more abrasive material to wear
down your blade. Watch the color of your slurry! When it turns a
different shade you’re probably through the cut.

Cooling when cutting is one of the most important aspects of
cutting performance. Water or some other type of coolant must be
used when cutting with diamond blades 1/2 to 3 gallons per minute
is a good range to go by. Low water flow can present several
problems including undercutting or overheating. Too much water
can work against you and the diamonds don’t get enough contact
on the material, this is know as “glazing”. Tip: Add a small amount
of liquid detergent to your water tank. (1 bottle to a 500 gallon
tank) Liquid detergent helps lubricate the cut and makes clean up
easier.

Saw power should always match diamond blade  power
requirements. Over powering your blade will make it cut faster but
the blade will wear out much too soon. Not enough power will
cause diamonds to round and be ineffective.

Applying some of these common sense techniques should help
increase your blade life thus reducing your cost per cut.