93
92
EN
EN
If the impact wrench does not have sufficient
power due to a lower compressor flow rate, this
can to a certain degree be compensated for in
the following ways:
y
larger volume of the compressor‘s pressure
vessel (air chamber).
y
an air hose with a larger inner diameter,
i.e. instead of using a hose with an inner diameter
of
∅
9 mm, use a hose with and inner diameter of
∅
13 mm (eg. Extol® Premium 8865143), which can
supply a greater volume of air to the tool.
y
n air hose with the shortest possible length,
i.e. replace the 10 m hose with a 5 m hose, the longer
the hose, the lower the air pressure at the outlet to the
tool, see further in the text.
ADDITIONAL INFORMATION
TO THE AFOREMENTIONED
a) The compressor must have a sufficient flow rate to
cover the air consumption of the impact wrench at the
max. operating pressure of 6.3 bar. In the event that
the flow rate is insufficient, the impact wrench will
exhibit lower torque (power). In the case of sufficiently
long breaks, the insufficient flow rate of a compressor
can be compensated for during shorter work periods
with pneumatic tools by a larger pressure vessel on the
compressor, which serves as an air storage reservoir.
The flow rate of the compressor is significantly
dependent on pressure. The higher the operating
pressure of the compressor, the greater is the loss
also of the flow rate. Normally, due to commercial
reasons only the flow rate is specified for a certain
compressor, omitting the operating pressure, because
in an attempt to achieve better sales, commercially it
is more important to provide the higher values of the
compressor‘s flow rate despite the fact that this flow
rate may correspond to an operating pressure of only
2-3 bar. A compressor has the highest flow rate value
at low operating pressure values and conversely the
lowest with the highest operating pressure.
•
ATTENTION
The value that is most predicative, i.e. most accurately
describes the performance of the compressor, is the
flow rate value at an operating pressure of the compre-
ssor of 6 to 8 bar because pneumatic tools, e.g. an air
impact wrench, to achieve high performance (torque),
consumes a large amount of air at the maximum
permitted operating air pressure of 6.3 bar, otherwise
bolts will not be sufficiently tightened or loosened.
There exists a simple method for quickly and easily
verifying the performance of a compressor and
for determining the flow rate levels at various
pressures, and to thereby compare compressors
of the same pressure vessel volumes from various
manufacturers and, thereby, determine which is
better at a corresponding price level.
COMPARISON OF COMPRESSOR
PERFORMANCE FROM VARIOUS
MANUFACTURERS
•
ATTENTION
y
It is always necessary to compare compressors with
the same pressure vessel volume and, likewise,
to assume that a two-piston compressor with the
same pressure vessel volume will be more powerful
than a single-piston compressor.
The most predicative value for the perfor-
mance of a given compressor is gained by
measuring the time it takes to pressurise the
compressor‘s pressure vessel to a pressure of
8 bar with the air outflow shut off.
Measure the time that it takes to pressurise
the compressor‘s pressure vessel to a pressure
of 8 bar with the air outflow shut off.
For this measurement, use a stopwatch, e.g.
on your mobile phone as it is necessary to
also measure seconds.
y
The higher performance compressor is the
one able to pressurise the pressure vessel to
a pressure of 8 bar in the shortest time.
y
The pressurisation speed is not linearly correlated,
and depends on the pressure in the compressor‘s
pressure vessel, meaning that pressurising a pre-
ssure vessel from 2 to 3 bar takes less time than to
pressurise from 7 to 8 bar, because when the motor
is pushing out the piston it needs to act against
a greater air pressure in the pressure vessel and the
time required to pressurise the pressure vessel is
thus indicative of the compressor‘s performance.
II. Technical specifications
Order number
4795010
4795012
4795013
Maximum torque
610 Nm
880 Nm
1300 Nm
Max. operating air pressure
6.3 bar (0.63 MPa) 6.3 bar (0.63 MPa) 6.3 bar (0.63 MPa)
Average air consumption
170 L/min
198 L/min
227 L/min
Size of tool tang
1/2"
1/2"
1/2"
Max. speed without load
10,000 min
-1
7,000 min
-1
7,500 min
-1
Size of male quick coupler
1/4"
1/4"
1/4"
Impact mechanism of the impact wrench
Twin hammer
Twin hammer
Twin hammer
Weight
1.4 kg
2.0 kg
2.0 kg
Sound pressure level according to EN ISO 15744
L
pa
93.9 dB(A); K=±3 dB(A)
Sound power level according to EN ISO 15744
L
wa
104.9 dB(A); K=±3 dB(A)
Vibration level (sum of the 3 axes) according to EN ISO 28927-2
a
h
= 3.99 m/s
2
; K=±1.5 m/s
2
AIR SUPPLY HOSE
- pneumatic air hose specified for an operating pressure of min. 8 bar (usually up to 15 bar)
Inner diameter of air hose
9 mm
9 mm
9 mm
REQUIRED AIR QUALITY
a) moisture (condensate) is removed by means of a filter (condensate separator)
b) with the addition of oil for pneumatic tools, which is added to the air by the lubricator (oiler).
Table 1
HIGH PERFORMANCE REQUIREMENTS
(TORQUE) ON THE IMPACT WRENCH
y
To achieve a high torque on the impact wrench,
it is necessary to consider the complete air
system: air source / compressor - air distribution
lines / dist.hose-tool (impact wrench), because
each of these system components must meet
certain criteria in order for the required opera-
ting parameters to be achieved, namely when
the upper performance limit is to be achieved.
Since the driving component of pneumatic tools
is air, the air system is very dynamic and any
change in the parameters in one part of the sys-
tem affects the performance of the powered tool.
IMPORTANT CRITERIA OF THE AIR SYSTEM
FOR ENSURING HIGH PERFORMANCE OF
THE IMPACT WRENCH
1) Sufficiently powerful compressor.
The compressor must have a sufficient flow rate at the
maximum permitted operating air pressure of the impact
wrench. A lower compressor flow rate can, to a certain
degree, be compensated for by a larger pressure vessel.
2) The hose must have a sufficiently large inner
diameter.
A hose with an insufficient inner diameter will not
provide a sufficient supply (flow rate) of air to the
pneumatic tool.
If the compressor has a lower flow rate, try using an
air hose with a larger inner diameter.
3) Well lubricated and maintained machine.
A pneumatic tool requires regular lubrication using
pneumatic oil by means of a lubricator, which ensures
a continuous supply of lubricant to the tool, otherwise
friction will increase on the internal parts, thus their
wear and a reduction in performance. In the case of
pneumatic tools, it is not sufficient to occasionally
add pneumatic oil between use, rather it is important
to ensure a continuous supply of lubricant in small
amount to the pneumatic tools.
