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SMA 30 BER-14/24.G1 / 01.01.2021 / V01.03-EN
Technical manual
Noise emission values in accordance with the DIN
EN 60745-1 standard:
Vibrations:
Note:
The measured values listed above depend on the
materials and operating procedures used and may
therefore be exceeded under other operating conditions.
Using the machine to create bevels with a width greater
than that permitted will result in a disproportionally large
reduction in the machine’s on-time and the service life of
the indexable carbide inserts. The vibration and noise
emission values will increase accordingly.
To prevent overloading the machine and to avoid
operator fatigue it is very important to observe the
maximum power-on periods especially when machining
wide bevels or high-strength materials.
Value Un-
certainty
Noise emission [dB (A)]
Emission sound pressure
level LpA 90 3
Peak emission sound pres-
sure level at workplace
(during milling operation)
LpGpeak 105 3
Sound power level LWA 101 3
Total vibration value
(tri-axial vector sum)
Appropriate to
DIN EN 60745:
Measured vibration emission
value
ah = 4,0 m/s²
Work process:
- 45° milling head
- 5 mm bevel width (C) in
12 mm steel sheet S 355 Uncertainty
K = 1,5 m/s²
Power-on time (POT):
To avoid damaging the machine, it is essential to be
monitor how long the machine has been operating
continuously (‘power-on time’).
All electric brushed motors generate large amounts of heat
in the rotor and stator. Although the machine is fitted with a
fan cooler that dissipates the heat produced, if the
machine is subjected to extreme loads (e.g. milling large
bevels, very hard or tough materials) and/or is run
continuously for a long period of time, the cooling system
may not be able to cope with the amount of heat
generated. If the operator continues to use the machine,
the rotor (armature) may overheat to such an extent that
the winding insulation melts causing a short circuit.
(C=bevel width, POT=power-on time)
The power-on time is always expressed as a
percentage of one hour.
Example:
If the power-on time is specified as 50 %, then you can use
the machine to mill bevels for a maximum of 30 min. in an
hour and must then leave the machine to cool for 30 min..
If the machine is subjected to heavy loads, the power-on
time might be 20 %, which means it can be used for 12
min. in any hour and must be left to cool for 48 min..
Before completely switching off the machine, we
recommend running the machine for one or two minutes in
idle mode (unloaded) so that fan can continue to draw cool
air through the machine.
Do not overload the machine!
The machine can become overloaded if, for example, it
continues to be used even though the bevel being cut is
too large for the material being milled, or if the cutting
inserts have become blunt and therefore unable to
penetrate the material.
Such conditions can lead to large machine vibrations or
even machine breakdown if the armature in the motor is
bent to such an extent that the rotor and stator rub against
each other, overloading the windings and blowing the
motor.
To prevent this sort of damage when milling large bevels
and/or hard materials, never try to machine the bevel in a
single pass, always use multiple passes, and do not forget
to change the carbide inserts before they become blunt or
worn.
Material strength C max. POT max.
Aluminium, copper, brass 8 mm 80%
Steel up to 400 N/mm² 6 mm 50%
Steel up to 600 N/mm² 6 mm 40%
Steel up to 900 N/mm² 6 mm 30%
Stainless steel (A2) 6 mm 20%
Stainless steel (A4) 4 mm 20%
