Setting Torque For Bolt Tightening (Non-Calibrated); Setting Torque For Bolt Tightening (Calibrated) - norbar HANDTORQUE HT 1 Bedienungsanleitung

Setting Torque for Bolt Tightening (Non-Calibrated)

1. Establish the correct torque figure for the bolt from manufacturer's instructions or by calculation. A
torque tension calculator is available on the Norbar website (www.norbar.com), which can be used as a
guide to help calculate the tension generated in a bolt for a given thread size, torque and friction value.
NOTE: Many factors have an effect on the torque/induced load relationship and care should be
taken to consider factors such as surface finish and amount/type of lubrication. In critical
applications, the relationship between torque and induced load should be determined by
experimentation with the actual components and lubrication used.
2. Divide the required torque by the 'Multiplication factor' of the multiplier (See Specifications section, page
13). This gives the input torque.
Example: A HandTorque
is an output torque of 5 N∙m, with a +/- 4% tolerance.
To reach the HandTorque
calculation is made:
3. Select a suitable torque wrench for the input torque. The wrench should be of high quality and regularly
calibrated.

Setting Torque for Bolt Tightening (Calibrated)

This section only applies to HandTorque's that are supplied with a Certificate of Calibration (see Figure 7).
The following part numbers come with a Certificate of Calibration; 180216, 180215, 18196, 18197, 18198,
18199, 180200, 180201, 180202, 180203, 180204, 180205, 180206, 180207, 180208, 180209,180210,
180211, 180212, 180213 and 180214.
1. Establish the correct torque figure for the bolt from manufacturer's instructions or by calculation. A
torque tension calculator is available on the Norbar website (www.norbar.com), which can be used as a
guide to help calculate the tension generated in a bolt for a given thread size, torque and friction value.
NOTE: Many factors have an effect on the torque/induced load relationship and care should be
taken to consider factors such as surface finish and amount/type of lubrication. In critical
applications, the relationship between torque and induced load should be determined by
experimentation with the actual components and lubrication used.
2. Divide the required torque by the 'Multiplication factor' of the
multiplier as stated on the Calibration Certificate included with
the HandTorque . This gives the input torque.
®
NOTE: Calibrated HandTorque's come with a unique
Calibration Certificate which highlights the
HandTorque's unique 'Multiplication Ratio. These
HandTorque's will have a slight variation in the
gearbox ratio, so for more accurate results the ratio
on the Calibration Certificate will need to be used.
Norbar multipliers are engineered such that each gear stage has a
specific velocity ratio. For example; a 25:1 gearbox has 2 stages
each with a velocity ratio of 5.45:1, giving an overall velocity ratio of
29.75:1. Taking the gearbox efficiency into account the
multiplication factor will give a ratio of around 25:1.
Torque output calculations are therefore a matter of
simple arithmetic with little risk of incorrect bolt loading due to
conversion errors. Other manufacturer's multipliers often require
graphs or formulae to calculate the input torque to achieve a
particular output.
8
HT 1 has a 'Multiplication ratio of 5:1, so for an input torque of 1 N∙m there
®
HT 1 maximum output torque of 1,700 N∙m the below
®
1,700 (Required Torque)
5 (Multiplication Factor)
= 340 N∙m (Input Torque)
24.21:1
FIGURE 7 – Certificate of Calibration
Supplied with Compact Series (see above
for applicable models).