Setting Torque For Bolt Loosening - norbar HANDTORQUE HT 1 Bedienungsanleitung

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.
Example: The HandTorque
Figure 7 displays a multiplication ratio of 24.21:1,
meaning that for every 1 N∙m of input, 24.21 N∙m are
output, with a +/- 4% tolerance.
To reach the HandTorque
is made:
3. Select a suitable torque wrench for the input torque. The wrench should be of high quality and regularly
calibrated.
The HT 52, 72 and 92 Compact Series models can also come as part of a kit which includes a Norbar
®
NorTorque Torque Wrench and Carry Case. The table below details the range of HandTorque
available:
Kit Part
Number
18186
18192
18195
®
The HandTorque Kit has a combined accuracy of +/- 6.5%. This is taken from a combination of the +/- 3%
®
NorTorque Torque Wrench tolerance and the working variation of the HandTorque
NOTE: The accuracy of +/- 6.5% is only valid provided the multiplication ratio on the Calibration
Certificate is used and reaction is taken within the parameters demonstrated in Figure 6.

Setting Torque for Bolt Loosening

1. To ensure that the multiplier is not overloaded, it is desirable to use a torque wrench even for bolt
loosening.
2. Divide the multiplier maximum output by the 'Multiplication factor'. This gives the maximum input torque.
3. Select a suitable torque wrench for the input torque.
® HT-92 Certificate of Calibration in
® HT-92 maximum output torque of 4,000 N∙m, the below calculation
4,000 (Required Torque)
24.21 (Multiplication Factor)
HandTorque ®
HT-52 (18196)
HT-72 (18198)
HT-92 (18199)
24.21:1
= 165 N∙m (Input Torque)
Kit Contents
Multiplier NorTorque
MDL 60 Dual Scale (130101)
MDL 100 Dual Scale (130103)
MDL 200 Dual Scale (130104)
FIGURE 7 – Certificate of Calibration
Supplied with Compact Series (see above
for applicable models).
® Torque Wrench
®
gearbox.
®
Kits
9