0.6
The only practical course of action is to measure the actual noise emission levels for the type
of work that is typically done. With reference to national standards, decide upon the necessary
hearing protection required.
In the absence of such measurements, it is advisable for anyone exposed to long periods of
moderate to loud noise to wear hearing protection. It is important to understand that hearing
loss is gradual and easily goes un-noticed until it is serious and irreversible.
Workplace
A clear working area without any obstructions is essential for safe operation of the machine. The
oor must be level and clean, without any build-up of chips, off-cuts, coolant, or hydraulic oil.
The workplace must be well lit, and protected from the elements, such as rain, snow, abrasive
dust, and extremes of temperature
Nothing may ever be placed on, or leaned against the machine, with the obvious exception of
the work piece on the table and conveyor of the machine.
Master Disconnect
Lock-out the machine before undertaking any maintenance or repair work on it. ‘Lock-out’ refers switching
off the master electrical disconnect switch, and locking it out so that it cannot be switched on again
without authorization.
On Hyd-Mech machines the Master Disconnect Switch will be of one of four types:
• Rotary switch mounted in electrical control cabinet door and inter-locked with door.
• Rotary switch mounted on the side of the operator interface console.
• Lever switch mounted in separate box on the machine.
• Supply disconnect switch supplied by user at installation and usually wall-mounted within
sight of the machine, depending upon local regulations.
In almost all jurisdictions, it is required that owners of industrial equipment establish and post
lock-out procedures. Know and use the lock-out procedures of your company or organization.
Residual Risks
The machine is still not completely de-energized if an electrical cabinet door type switch
is locked-out.
The line side of the disconnect switch itself remains energized.
Variable speed blade drives store dangerous voltage in their capacitors, and this re-
quires time to dissipate. After locking out power, wait 3 minutes before beginning to work
on machine electrical circuits.
If compressed air is supplied to the machine to power a mist lubrication system or other
devices, it should be disconnected, and any stored air pressure released before working
on the machine.
The weight of individual machine components represents stored potential energy that
can be released if they fall when disconnected. Secure these components with ad-
equate hoisting gear before disassembly.
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