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