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6.4
Rule of thumb for peripheral speed/cutting speed
– Reduce the peripheral speed when hard aggregates are encountered (silex, flint etc.).
– The peripheral speed can be increased when the concrete cuts easily.
– Use the normal, recommended peripheral speed when the steel reinforcement content is high.
6.5
The sawing procedure
– Always mount the saw blade in the correct direction of rotation. The
direction of rotation of the motor is engraved on the saw head. The
cutting edge of the diamond grit must face the direction of rotation.
– Use a small saw blade (800 mm dia.) to cut an approx. 5 cm deep
guide kerf (in London flint, maximum 2 cm) at approx. 60% power
output (operating pressure approx. 100 bar).
– Depending on conditions, subsequent cuts can be made to a depth of
approx. 10–15 cm at full power, i.e. at an operating pressure of
approx. 180 bar (use pressure gauge, item no. 310653/1).
– When reinforcing bars are cut lengthways, or when a large area of
steel must be cut, position the saw blade so that concrete above and
below the steel is also cut. This prevents polishing of the segments.
– Do not attempt to work with a blade if its segments have become pol-
ished. A blade with polished segments can be resharpened by mak-
ing a shallow cut (2–3 cm) in unreinforced concrete or in an abrasive
material using little water. Alternatively, the segments can be
resharpened by making a dry cut in the Hilti sharpening plate, item
no. 51343/2.
– During the main cuts, the lowest possible number of segments should be in contact with the concrete. The
saw can then make more efficient use of the power available.
6.6
Saw blades - the Hilti DS-BR saw blade programme
– The quality of the saw blade and selection of the correct type of blade is decisive. The Hilti DS-BR blade types
BC and LC have been designed for use with the DS-TS 30 and other equipment of a similar power rating. They
achieve optimum cutting performance while reducing the load on the saw system to a minimum.
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