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been switched off. Allow the moving parts to stop completely without
interference. Do not try to stop the machine by holding an object
against the disc. NEVER place the grinder down until the disc has
completely stopped moving
• A grinding disc will gradually wear down during use, reducing its
size. If a disc becomes too small to work with easily, stop using it
and replace it with a new disc
Additional Safety Recommendations for
the use of Superabrasives on Handheld
Machines
• Superabrasives are generally inflexible and could shatter, so must
be handled with the utmost care. Damaged or improperly mounted
superabrasives are dangerous and can cause SEVERE injury to the
user and other people in the vicinity
• Types of superabrasive wheels include diamond cutting discs,
welded metal discs, CBN discs etc. Choose your superabrasive
tool carefully, taking into consideration the workpiece material, the
machine dimensions and capabilities. Make sure the machine does
not exceed the maximum operating speed of the superabrasive disc
• NEVER use superabrasive cutting discs for side grinding, as this
might lead to the disc shattering
• Superabrasive wheels have to be carefully inspected and tested
before mounting. Metal wheels should be subjected to a sound test:
hold the wheel on a mandrel or with a finger inserted through the
bore, then tap it with a non-metallic object at several points and
listen each time to the sound produced. An intact wheel will produce
a clear ‘bell like’ metallic sound. Damaged wheels will give a dull,
chattering sound. If in doubt, DO NOT USE, MARK AS DAMAGED
AND DISCARD
• Make sure the machine’s mounting flange is compatible with the
superabrasive wheel. Refer to the manufacturer’s
mounting instructions
• ALWAYS conduct a test run after mounting, with no load for at least
30 seconds, to determine if the wheel runs balanced and does not
produce excessive vibration. If it does, switch off IMMEDIATELY,
remove the disc, inspect, re-mount and re-test if no damage
is detected
• If planning on using the superabrasive wheel with a coolant, liquid
dust suppressant or lubricant, first check if the wheel, machine and
workpiece are compatible with wet cutting and with the compound
to be used. Always apply liquid to an already running wheel,
never to a non-moving tool, as the unbalance could lead to the
rupture of the wheel. When switching off, remove the liquid supply
first and let the machine run at no-load, until centrifugal forces have
drained all liquid from the wheel. Dry off the wheel after use,
and prevent liquid from being absorbed into the wheel
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