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OPERATION
8 Operation When grinding a surface for the first time and there
are any doubts regarding the hardness, it is always
8.1 Protective clothing recommended that a hard bond diamond is used at
the beginning. This will ensure minimum wear on the
l NOTICE diamond segments.
During grinding operations, the operator
is exposed to the following risks: 8.3 Tool selection
– intoxication and poisoning due to the 8.3.1 Diamond segments
accumulation of dust and vapours con-
taining harmful chemicals Number of diamond segments below the appli-
ance
– permanent damage to ears due to ex- Increasing the number of segments below the appli-
tended exposure to noise ance:
– reduces the pressure on each individual diamond
– risk of trapping due to moving parts
segment
To reduce the effects of damage caused by accidents, – reduces the wear on the diamond segments
it is recommended that type-approved protective – reduces the load on the appliance resulting in
clothing is worn. Always wear:
– safety helmet less energy consumption
– headphones or ear-buds – a more even scratch pattern is created, especially
– glasses or protective visor
– breathing mask on soft floors.
– gloves However, if the number of segments below the appli-
– close fitting, resistant, comfortable clothing to allow ance is reduced, the opposite will occur.
free movement Wet and dry grinding
– boots with steel toe-cap and anti-slip sole When wet diamond segments are used:
– production speed increases compared to dry grind-
8.2 Identifying the hardness of the
concrete ing
– diamond segments are subject to wear more rap-
l NOTICE
In order to select the most suitable tool idly due to the frequency of the liquid mortar and
for grinding operations, the hardness of therefore harder bonding agents can be used (com-
the concrete must be identified and the pared to dry grinding)
condition of the surfaces must also be as- – scratches from diamond grains will be deeper.
sessed. However, if the number of segments below the appli-
ance is reduced, the opposite will occur.
The first factor to be considered when selecting the
tool is the hardness of the concrete, which is calculat- Take note of the following indications when using dry
ed using its resistance to compression. The higher the diamond segments:
resistance, the harder the concrete resulting in grind- – the production speed is lower on harder materials
ing operations being more difficult to complete.
compared to dry grinding
Other factors which affect the choice of the tool are: – softer bonding agents are required to help combat
– condition of the surface. If it is smooth, grinding will
segment wear given that there is no liquid mortar
be more difficult, if it is rough or damaged, grinding which can help the wear of diamond segments
will be easier – scratches from diamond grains will not be as deep
– the presence of any finishes or residues (for exam- as with wet grinding
ple, epoxy finish, adhesives and glue for tiles, etc.). – diamond segments generate more heat.
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