Mechatron ATC Series, Operating Manual

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Operating Manual | mechatron ATC
3.2 Risks of spinning parts and bursting tools
Use a machine housing!
The high spinning speed of tools with 12.000 rpm and more causes
a high risk of injuries by flying chips and bursting tools. Parts of a
bursting tool act like a shrapnel which can cause injuries dange-
rous to life. Therefore it is compulsory to use a machine housing
which can protect the user by withstanding flying tool parts and
chips and in addition to that, has a safety switch which is cutting
the power supply of the motor spindle as long as the machine
housing is not closed properly.
Ensure that the spindle is not running!
Before opening the machine or the machine housing, always ensure
that the spindle has stopped to zero speed! The motor shaft can still
rotate after cutting off the power (sometimes more than a minute).
Before a tool change it must be ensured that the power supply is
completely shut down to avoid an accidental start of the spindle.
This should be done by unplugging the spindle or the VFD from the
power supply.
Only use balanced and undamaged tools!
Because of the high rotation speed of the spindle motor, tools and tool holders must be well
balanced. An insufficient balanced tool can cause vibrations which will lead to bearing damages
or even resonances which might make the tool bursting. Therefore balance the tools in advance
with proper devices like a balancing machine. Check the machine for vibrations after every tool
change. If the vibrations are improper, immediately stop the spindle and change the tool. Only
use sharp tools.
Only use tools designed for the rotation speed!
The maximum rotation speed of the motor spindle must not exceed the maximum nominal rota-
tion speeds allowed by the tool manufacturer. Exceeding the allowed rotation speed can cause
bursting of the tool or damages of the spindle motor.
Overall balancing of tool and toolholder must be G2,5 or better at nominal speed.