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FEATURE ABRASIVE DISC SAFETY
Sell only approved bonded abrasives
In the field of industrial applications thousands of accidents involving abrasives occur each year. Stock the right discs and keep end users safe.
cutting and grinding tools safer.
T
worldwide and is an internationally protected
or its improper operation, poses a greater risk to
Founded in Bonn, Germany, in 2000,
trademark. Look for its trademark on bonded
the user than say, the use of a hammer without
abrasive products such as Ruwags.
reading the manual. The variety of sizes, shapes
oSa certification is only issued to companies
labelled and delivered without a proper manual.
clear labelling adherence. These are specified in the
whose products and manufacturing techniques
When it comes to cutting and grinding tools, the
European Safety Standards for Abrasive Tools.
he Organization for the Safety of Abrasives (oSa) makes working with
oSa has grown to be known as the symbol almost 60 leading manufacturers of premium tools trust.
comply to CEN safety standards. oSa is the symbol for the highest safety
There are many tools that are easy to use, hardly
stakes are higher, and so should be the safety requirements. An incorrectly selected grinding wheel
and specifications of these particular tools, requires
OPERATING SPEEDS
115mm angle grinder:
230mm angle grinder:
Bonded abrasives are manufactured to
Operating speed = 13300RPM
Operating speed = 6600RPM
operate at specific speeds. These are
Disc diameter
= 115mm
Disc diameter
indicated by the colour of a line running
Circumference
= 2πr
Circumference
= 2πr
along the diameter of the disc.
= 2(22/7 x 57.5mm)
= 2(22/7 x 115mm)
= 361.4mm
= 722.86mm
Blue
50m.s-1
= 230mm
Peripheral speed = 361.4mm x 13 300RPM
Peripheral speed = 559.43mm x 6 600RPM
Yellow 63m.s-1
= 4 806 620mm/min
= 4 770 876mm/min
Red
= 80.11m/s
= 79.51m/s
= 286.24km/h
80m.s-1
Green 100m.s
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AUGUST 2019 DIY & INDUSTRIAL TRADE NEWS
= 288.39km/h