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Three Ways To Meet Your Toughest Bolting
Requirements
What
is a Torque Multiplier?
 A torque multiplier is a device that increases the torque that can be applied by an
operator. Because the power output can not exceed the power input, the number of output
revolutions will be lower than the number of input revolutions (Torque x rpm = Power)
How
Handtorque Torque Multipliers Work
Handtorque multipliers incorporate an 'epicyclic' or 'planetary' gear train having one
or more stages. Each stage of gearing increases the torque applied by a factor of 5,
allowing Norbar to offer multipliers in ratios of 5:1, 25:1 and 125:1.
In the planetary gear system, torque is applied to the input gear or 'sun' gear. Three
or four planet gears whose teeth are engaged with the sun gear therefore rotate. The
outside casing of the multiplier, or 'annulus' is also engaged with the planet gear teeth,
and would normally rotate in the opposite direction to the sun gear. A reaction arm
prevents the annulus from rotating, and this causes the planet gears to orbit around the
sun. The planet gears are held in a 'planetary' carrier which also holds the output square
drive. Therefore as the planet gears orbit around the sun. the carrier and so the square
drive turns.
Without the reaction arm to keep the annulus stationary, the output square will not
apply torque.
Why
use a Handtorque Torque Multiplier?
Safety - use of long levers can be dangerous. Torque multipliers mean a
reduction in the lever length or operator effort by a factor of 5, 25 or 125.
Space limitation - the use of a long lever may be impossible due to the
available space.
Accuracy - torque will be applied most accurately when it is applied smoothly
and slowly. Torque multipliers enable this by removing much of the physical effort from
the tightening task.
Pneutorque
Applications
The smooth and continuous torque output of
the Pneutorque makes these tools suitable for a wide range of bolting and non-bolting
applications.
Bolting
 Pneutorques are ideally suited for
tightening and untightening bolts of up to 6" diameter. The following is just a small
selection of applications:
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Wheel nuts on trucks, buses and large machinery.
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Structural steelwork.
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High pressure joints eg. Pipelines, boiler feed pumps and pressure vessels.
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Engine head bolts.
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Injector heads on plastic injection moulding machines.
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Heat exchangers.
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Heavy vehicle production eg. Chassis and suspension bolts.
Non-bolting
Whenever a high continuous torque is needed, Pneutorques can be used as the power
source. Typical applications include:
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Ball valve operation.
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Powering wagons and gantries
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Turning the crankshaft) during build.
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Weld testing by applying test torques.
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Roller adjustment in steel mills and paper mills.
Electrotorque
Multipliers
What is an Electrotorque?
 The Electrotorque uses the same range of gearboxes as
the Pneutorque, but exchanges the air motor for a robust, purpose built 48 Volt DC
electric motor.
An Electrotorque consists of the tool head (motor and gearbox) and a separate
transformer and controller built into one box. Transformer/Controllers come in 110 Volt
and 240 Volt versions which must be specified at the time of ordering.
The Controller will deliver the correct current to the tool for it to stall at the
required torque. All that the operator has to do is enter the required torque onto the
digital display on the controller. No graphs are needed to set the tool because the
current versus torque parameters are contained within the controller.
In use, the Controller will act as a torque monitor. However. it should be noted that
the Controller is actually measuring current and converting this to torque using a factor
pre-set at the time of calibration on Norbar's test joint. As with all power tools, the
output will vary on different joints depending on how 'hard' or 'soft' they are. Precise
results on any joint can be achieved by combining the tool with a torque transducer and
display instrument.
Why use Electrotorque?
Electrotorque has some important advantages over pneumatic tools:
1. The tool will run at full speed wherever it is set within it's operating range. By
contrast, air tools slow down as air pressure is reduced for lower torques.
2. The Electrotorque avoids the air exhaust associated with some pneumatic tools and is
even quieter in operation than the Pneutorque.
3. Operating costs of an electric tool will be lower than pneumatics due to the cost of
generating compressed air.
The Electrotorque is designed to work with all of the accessories and options
designed for the Pneutorque range.
Summary of the Electrotorque Advantages
- Powerful 2.5 kW motor for excellent performance.
- Accurate torque control, repeatable to +/-3%.
- Motor is just 48 V for operator safety.
- Bi-directional operation with torque control in one direction (full power reverse) or
in both directions.
- Clean and quiet operation. No air exhaust and low operator fatigue.
- Operating costs lower than pneumatic tools.
Hydraulic
Nutrunner
 With the introduction of the Hyspan hydraulic torque multiplier to Norbar's product
range we now are able to offer a tool that is compatible with every industrial power
source.
Although primarily developed for subsea and mining applications, the Hyspan is ideally
suited for environments where the use of compressed air or electricity is not permitted or
not possible.
The robust reversible hydraulic motor has been designed to operate at under 2000 psi.
Tool can be powered directly from vehicle and mining prop hydraulic systems.
Torque control is achieved by the adjustment of the oil flow compared to specific
settings taken from a flow versus torque graph supplied with each tool.
Models available for almost every bolting application up to 100,000 N.m (73,500
ft.lbs.)
- Forward and reverse operation.
- Low operator fatigue - non impacting or pulsing.
- 4.76 gal. per minute flow rate.
- Maximum working pressure - 2000 psi.
- Will operate with up to 95% water, 5% oil hydraulic mixture.
- A variety of reaction styles are available for maximum versatility.
- Automatic two speed models available.
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