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- How to
select an air
motor
- Do I need an
FRL and what is
it
- Do I need to
use oil
- How do I find
specs
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FOUR
VANE OR EIGHT
VANE.
1.)
Four vane units
meet most
requirements,
but for more
precise inching
control and
minimum blow by
in applications
where the motor is
operating in a
stalled
condition,
specify eight
vane models.
2.)
Additional vanes
will not
increase maximum
starting horse
power but will
increase
average starting
torque by
approximately 25
percent.
3.)
Additional vanes
will actually
decrease the
horsepower
of an air motor
under running
conditions,
while the flow
remains the
same. The motor
is less
efficient and
will require
more air per
horsepower
developed.
4.)
Additional
vanes, however,
will decrease
the blow-by up
to 30 percent at
stalled
conditions.
5.)
Additional vanes
in a motor being
operated under
stalled
conditions, most
of the time
(such as when
used as a power
spring) will cut
down on blow-by
of air and
reduce air
consumption.
6.)
Additional vanes
in an air motor,
used in an
inching
application
(such as a
hoist) will,
because of
decreased
blow-by, permit
better inching
control.
7.)
Additional vanes
in an air motor
will permit
operation at
lower speeds
than recommended
for 4 vane air
motors.
> More
GAST MOTOR
SIZE.
( OIL SERIES )Air motors
differ in many
ways from other
power sources.
These unique
operating
characteristics
must be
considered when
selecting an air
motor for a
particular job.
It is easy to
change
horsepower and
speed of an air
motor
by throttling
the air inlet.
Therefore, the
best rule of
thumb for
selecting an air
motor is to
choose one that
will provide the
horsepower and
torque needed
using only
two-thirds (2/3)
of the line
pressure
available. The
full air line
pressure will
then be
available for
overloads and
starting.
NON-LUBRICATED
AIR MOTORS.
(
NL
SERIES )For air motor
applications
where
contaminated
exhaust cannot
be tolerated in
the workplace,
non-lubricated
air motors, the
NL series,
provide the
solution.
Advantages: No
oil expenses,
Rugged and
reliable,
Performance
flexibility,
Corrosion
resistant, No
periodic
inspection.
OUTPUT
POWER, TORQUE &
AIR CONSUMPTION
VS SPEED.The output
power of an air
motor is
relative to
speed and to air
line pressure.
DO I
NEED AN FRL.
( Filter
Regulator
Lubricator )
FRL stands
for Filter
Regulator
Lubricator.
NL Series
Oilless Motors
do not require
the (L)
Lubricator
section that
puts oil in the
air line. For NL
Oilless Air
Motors you only
need a FR,
Filter Regulator.
The FRL
letters stand
for: (F)
Filter
that cleans the
air, (R)
Regulator
that regulates
air pressure and
controls the
speed (R.P.M.s
of the air
motor), (L)
Lubricator
that installs
small amounts of
oil into the air
line to
lubricate the
air motor. Note:
be sure to use
only
Gast AD220 Air
Motor Oil
as it meets and
exceeds all
requirements in
assisting in
long air motor
life and
durability.
Clean air
and quality
oil are key
in long air
motor life.
Using ambient
air (non
filtered air)
will
dramatically
reduce air motor
life, many times
by half. Off the
shelf oil may
reduce air motor
life as well if
it cannot with
stand higher
temperatures and
load. When the
oil starts to
break down it
will start to
clog the air
motor and
quickly create
wear on the
vanes in the
motor.
IF MY
AIR MOTOR NEEDS
OIL, WHICH OIL
SHOULD I USE.
Gast AD220 Air
Motor Oil
is highly
recommended.
Typically 1 drop
of oil may be
needed per
minute of motor
operation. Air
motor size,
R.P.M.s and load
may decide the
amount of oil
needed.
TORQUE
VS SPEED.
1.) An air motor
slows down when
load increases .
. .
at the same
time its torque
increases to a
point where it
matches the
load. It will
continue to
provide
increased torque
all
the way to
the stalled
condition, and
it can maintain
the stalled
condition
without any harm
to the motor.
2.) As the load
is reduced, an
air motor will
increase speed
and the
torque will
decrease to
match the
reduced load.
3.) When the
load of an air
motor is either
increased or
decreased,
speed can
be controlled by
increasing or
decreasing air
pressure. 4.) Starting
torque of an air
motor is lower
than running
torque. While
this
provides smooth,
low-shock
starting, it is
necessary to
have
additional
air line
pressure for
starting under
heavy loads.
AIR
CONSUMPTION VS
SPEED.Air
consumption
increases as
speed and air
pressure is
increased.
DETAILED
CHART
INFORMATION
Detailed
graphs showing
Output Power vs.
Speed ,
Torque
vs. Speed
and Air
Consumption
vs. Speed
are located
on
each
page, at the
bottom. Gast
PDF Service
Guide
Example:
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