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Diamond Blade Concrete Cutting
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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.