IPT GNV-19 User manual

2010
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GNV-19 Needle Scaler is a remarkable tool! In spite of its very
small size it is very powerful and runs with hardly any vibrations
due to the advanced, patented anti-vibration system. The low weight
makes it possible to operate with one hand and the low vibration level
minimizes long term health risks and lowers fatigue. This makes it
possible to use the tool for long time periods. The noise level is also
quite low compared to other tools.
Following these simple instructions will ensure a long life of excellent
operation. Note that this tool needs generous lubrication.
•Low air consumption
•Low noise level
•Rubber sleeve and grip
for comfort
•Easy needle exchange
•Extremely low vibration
General Information
The Needle Scaler is designed to operate at an air pressure of 6.5 to 7
bar, but will tolerate some additional variation without much change in
performance. Do not exceed 8 bar pressure (although normally the
excess pressure will discharge into the atmosphere). Connect to a 10
mm or larger hose.
The compressed air should be dry and clean. A filter unit should always
be used. Inline lubrication is recommended. Where this is not available,
apply a generous amount of oil at the inlet every 4 hours of operation!
See page 6 for information regarding accessories.

GNV-19, page 2
Important safety notes
All local safety rules with regard to installation, operation and
maintenance shall be adhered to at all times. Always use adequate
personal protective gear, e.g. safety goggles, noise protection, gloves
etc. as appropriate.
Always disconnect the tool from the air hose before changing needles or
making other adjustments.
Make sure there is no accumulation of water or dirt in the compressed air
hose by carefully blowing the hose clean before connecting the tool. The
compressed air should be dry and clean. A filter unit should always be
used.
Warnings
•Do not exceed 8 bar pressure. Use a regulator set to 6.5 to 7 bars.
•Power tools are generally not insulated. Do not use near or in contact
with electric power sources.
•Power tools shall not be used in explosive atmospheres.
•Do not use needles or chisels that are broken, cracked or deformed.
Use only accessories designed for this tool.
•Stored compressed air may cause a hazard.
•Long hair or loose clothing may be drawn in or trapped by the tool.
•Make sure that any sparks that may be emitted are directed so as not
to cause a hazard.
•Be aware of the risk of a whipping compressed air hose.
•Use a facemask or respirator if dust is created by the work.

GNV-19, page 3
Operation
The Needle Scaler is designed for rust and paint removal, weld dressing
and scaling, deslagging, cleaning concrete, etc. It is powerful and has a
very high scaling efficiency. The remarkably low vibration level makes it
possible to work with higher precision than with other tools and the noise
level is low compared to other needle scalers. With these ergonomic
features you can work for longer periods without fatigue.
As the GNV-19 doesn’t work exactly in the same way as conventional
scalers, you need to get acquainted with the tool to be able to fully take
advantage of the advanced features.
The scaling efficiency depends somewhat on the force you apply on the
tool. For efficient material removal you will find that an intermediate force
works the best. Don’t be fooled by the fact that you don’t feel a lot of
vibrations. The tool is very strong and works fast. Look at the result on
the surface you are working on!
The discharge of the compressed air is through the front of the tool.
Some air circulates in and out of the tool through an opening between
the rear (21) and the housing cover (23). This circulation is directed
towards one side and downwards but the opening in the housing cover
can be rotated to direct the circulation flow as desired.
This tool is a low vibration tool. If you can feel that the vibration level has
increased, stop using the tool! Increased vibrations indicate that
something is wrong and continued operation might damage or destroy
internal parts. The reason for more vibrations can be a damaged
housing, a broken spring or other part. It can also depend on that the tool
has been pulled apart and not been assembled properly.
For applications that produce a lot of dust it may be advantageous to
connect the tool to an industrial vacuum cleaner. This can be done via a
vacuum attachment that fits around the front part of the housing. See
page 6 for the part number.
The tool can also be fitted with a chisel adapter for occasional chisel
work. See page 6 for the part number.

GNV-19, page 4
Changing Needles (See separate Instructions for Non-Spark Needles.)
Note: Always disconnect the tool from the compressed air line when
removing or loading needles. Work on a workbench to prevent parts from
falling on the floor. Do not point the tool downwards when removing
the needles. Parts can then fall out and cause damage.
Push in the Front (2) and twist to release the bayonet grip. The Front can
now easily be pulled out as well as the Needles with the Needle Holder
(4) and the Forward Spring (3).
Replace the Needles in the Needle Holder making sure that the
orientation is per the picture below. The heads of the Needles should be
on the “top side” (the side curved upwards) of the Needle Holder.
Place the Forward Spring around the Needles and insert the package
inside the Housing. Follow with the Front, push and twist it into position in
the bayonet. Make sure it snaps into position. The hold will become more
powerful when the air is turned on.
Be careful not to scratch the Forward Spring. A scratched or damaged
spring can fail at any time.
Use only quality needles. Inferior needles will wear quickly and break
more easily. The GNV-19 is strong and doesn’t need any chisel shaped
needles for normal applications. It comes with flat end needles as
standard. Chisel shaped ends can easily leave deep marks on the
surface you work on and the ends need to be re-sharpened frequently.
GNV-19 comes with 127 or 140 mm long needles (3.2 mm diameter).
They give optimal performance both regarding scaling efficiency and
vibration level Longer needles can be used. Always use needles of the
same length. Replace any needles that break or the tool will not work as
intended. Use the full number of needles at all times. Grind down any
replacement needle to match the length of the needles already in place.
Needle head on top!

GNV-19, page 5
Maintenance
Lubricate regularly (disconnect the scaler from the air hose and apply a
generous amount of oil at the air connection). Use only quality air tool oil.
Use about 1 cm3for every 4 hours of continuous operation. If the
compressed air already contains oil from a continuous lubrication unit,
there will generally be no need for extra lubrication.
Lack of lubrication will result in
excessive wear of critical parts
inside the tool, and also of the
needles and the needle holder
Note: Do not open the tool (except for changing needles) as it will void
the warranty!
The Housing (5) is threaded into the Rear (21) using Loctite on the
threads. Do not clamp the Housing into a vice! Deformation of the
Housing will result in poor performance and increased levels of vibration.
Use only original IPT spare parts for any replacement! Other parts may
result in decreased performance and/or increased wear and/or damages
to the tool.
Warranty
The GNV-19 Needle Scaler is warranted for 12 months from the date of
purchase against faulty workmanship or materials provided the tool has
not been opened by unauthorised persons, has always been lubricated
and connected to a filtered air supply of the recommended pressure.
Please return any defective tool to your authorised supplier.
This warranty does not include repair or replacement required because
of misuse, abuse or normal wear and tear.
Use only original IPT spare parts for any replacement. Other parts may
result in decreased performance and/or increased maintenance and
wear.

GNV-19, page 6
Accessories
Needles, 3.2 mm diameter x 127 mm long, Set of 19 G-19-01
Needles, 3.2 mm diameter x 140 mm long, Set of 19 G-19-01L
Chisel Adapter for Cleco style chisels G-19-50
(See HRV-601A for available chisels)
Vacuum Attachment G-19-90
Spare Parts Ordering
See the exploded view on the last page for names and numbers of spare
parts. For ordering, simply use the pre-fix G-19- followed by the number
from the table. E.g. Needle Holder G-19-04.
Technical Data
Length 272 mm
Weight 2.4 kg
Vibration Level1≤2.0 m/s²
Noise Level298 dB (A)
Frequency of Strokes 110 Hz
Maximum Air Flow 120 l/min
Air Pressure 6.5-7 bar
Maximum Air Pressure 8 bar
Maximum Air Temperature 35 °C
Hose Coupling 1/4 inch
Size Hose Recommended 10 mm
1Per ISO 8662-14 working on a steel ball energy absorber. As shown in ISO 5349 there is a strong correlation between
vibration level and vascular diseases such as e.g. “white fingers”. This is a very low value and doesn’t vary much for different
working conditions. Most conventional tools have much higher vibration levels, when measured with the same methods.
2Idling. (When working on metal the noise level is generally higher). The tests were made with microphones placed 1.6 m
above the floor level and 1 m from the surface of the tool with equipment according to class 1 (IEC 651).

GNV-19, page 7
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