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Maintenance
Incorrect!
Correct!
Sawing through reinforcing bars longitudinally
When a reinforcing bar has to be sawn through longitu-
dinally, it is absolutely essential that the reinforcing bar
is cut all the way through. This prevents the segments
becoming polished as the blade cuts through concrete
before and after (above and below) the steel bar.
6.4
Resharpening a saw blade
In the unlikely event of the segments becoming polished,
it is absolutely essential that the blade is resharpened.
Do not attempt to saw with a polished blade.
The consequences of sawing with a polished blade:
– Very low cutting power
– Blade wanders off the line
– Diamond segments and steel disk of the blade over-
heat causing loss of blade tension
– Excessive mechanical stress on the diamond segments
causes segment deformation
– Reduced blade life
Generally speaking, a polished diamond saw blade can
be resharpened in three different ways:
1. Using a Hilti sharpening plate
Use wedges to clamp the sharpening plate directly against
the rail support between the base material and the guide
rail. The rotating saw blade should then be allowed to
make a cut across the sharpening plate 2 or 3 times with-
out using any water. (The sharpening plate must be
moved approx. 1 cm after each cut.)
Tip: In order to make optimum use of the sharpening
plate, it should not be cut all the way through.
2. Using an abrasive base material
(Sand-lime block or brick)
If no Hilti sharpening plate is available for use, a sand-
lime block or abrasive brick can be used for sharpening
as described in paragraph 1 above. When this method
is employed, however, a little water should be used.
3. In the cut, during sawing
The saw blade can also be resharpened during the saw-
ing operation, as follows:
– Cut to a depth of only approx. 2 cm in the concrete.
The blade must not contact reinforcing bars.
– Reduce the speed (rpm) slightly
– Select rapid advance
– Use very little water
– Repeat the procedure 2–3 times.
6.5