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The EvoTorque and Voltage Drop

My name is Mark Hadfield and I am one of the Technical Sales Engineers based at Norbar in Banbury. One of our roles is to liaise with our distributors and customers to provide solutions to any issues they may have with any Norbar products.I was involved with the original testing of the EvoTorque prior to its launch and have been closely involved with the use of the tool ever since.    The EvoTorque, in common with other mains powered tools, is often used with an extension lead. This, in turn, has lead to questions from Customers and Distributors as to the effect of voltage drop on the EvoTorque. For an AC tool voltage drop describes how the supplied voltage is reduced as electric current moves through the passive elements (in this case the cable) of an electric circuit. This is caused by the internal resistance of the cable and the resistance to change of current (Reactance). Together they are called Impedance.   We knew the EvoTorque exceeded the minimum requirements for minimum and maximu ...

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ISO 6789: 2016 takes a step closer in New York

As the UK lead delegate for the ISO TC29 SC10 technical committee, I have the honour to represent the UK in drafting standards for tightening tools. The meetings are hosted by different national delegates each time and last week the meeting was in New York, with delegates from seven countries. One of our key standards is ISO 6789. This torque wrench standard is now 12 years old and the new standard being developed will continue to specify requirements for design, manufacture and  calibration. Overall the main purpose of our work is to improve the performance of torque wrenches and to ensure consistent calibration results from different laboratories.   There are two significant changes this time. One is to separate the calibration requirements into Part 2, leaving the design and manufacturing requirements in Part 1. The second is to provide a method for calibrating the measurement device used to calibrate the torque wrench. In the UK we have a perfectly good stand ...

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Training and Flexibility of Staff

When faced with a variable workload with regards to volume and differing parts over a number of shifts, the question always arises as to how be the most effective way of managing resource. On two of our shifts the work centres outnumber the staff; therefore flexibility of staff is essential to enable the planning function to run the work centres they need to meet demand.   To control and maintain the flexibility on any shift, the manager uses a training matrix to register all aspects of staff training, safety manning levels are set for each critical work centres. If staff levels drop below the safety number, the shift manager will take appropriate action to bring the level back to the agreed number. This allows the shifts to cover all work centres through periods of holidays and absence. One area of flexibility that can easily be overlooked, is ensuring that once a member of staff has been trained to the relevant level, that skill level is maintained.. This is dealt with by transferring staff around th ...

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More, more, more!

Interacting and engaging with prospects at exhibitions is probably top, or very close to the top, of every exhibitor’s wish list. How this is best achieved will depend on a multitude of factors such as; the type of exhibition, the product or service being exhibited, and the audience. However attracting visitor’s attention, and creating stand-out is absolutely essential. During the regional trade shows of 2014, Norbar was able to assess what customers and prospects wanted from Norbar at events, and then how it could deliver on this. As the leading Torque Tool manufacturer Norbar wanted to be able to: ·         Interact and engage with visitors ·         Tailor each show presence to the audience ·         Use video to highlight products features and benefits ·         Give product demonstrations &m ...

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Truck and Bus Wheel Safety

If you have ever wondered about the impact of a detached truck wheel hitting a car at 50mph, Michelin North America and the Tire Industry Association have produced a great video that answers the question.  Go to YouTube and look up “Wheel End Safety 3 of 3”.   Whenever I talk to people about the importance of truck and bus wheel bolting to avoid “wheel off” accidents my comments are met with a sceptical “when does that ever happen?” response.  However, it certainly does happen and I believe that it is more common than most people realise.  While you are on YouTube looking at the Michelin video, you will also find numerous examples caught on camera.   In fact, according the Brake – the road safety charity – it is estimated that there are several hundred instances of wheel detachment per year in the UK alone.  16% of these result in accident, 4% in fatality so this is a relatively common and serious issue.   Of course, torq ...

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Torque Screwdriver Application - An Audio Loudspeaker



It’s not just large industries like Automotive and Oil & Gas which require torque precision, even high quality audio loudspeakers will have a specified torque for the drive unit bolts. 


On Naim NBL speaker pictured above, a Norbar TTs Torque Screwdriver is being used to accurately achieve the 3.6 N.m for the mid-range drive unit. Norbar recommends that Hi-Fi dealers and audio enthusiasts check the speaker drive unit bolts to achieve best audio performance.


Norbar's range of Torque Screwdrivers embodies the values of the TT Series brand: accuracy, ease of use and comfort in use.


With an accuracy that exceeds the requirement of ISO6789 (+/-6% for tools up to 10 N·m). Furthermore, they are engineered to retain this accuracy over many thousands of tightened cycles.

An end to over-bolting? [Part 2]

The aerospace sector has been very forward thinking in its use of materials to reduce aircraft weight. When it comes to bolting design and practise however, the industry has not experienced the same level of advancement. Torque is an indicator to bolt tension (sometimes called pre-load) and it is the bolt tension that we really need to control. The final stage of the bolting evolutionary ladder is therefore direct control of the tension induced in the bolt.    There are various ways of doing this, including strain gauging the bolt or adding a load cell, load indicating bolt or washer into the assembly.  However, such methods can be costly or impractical to implement.  A more efficient method which requires minimal modification to the bolt is to ultrasonically measure the extension of the bolt due to the tightening process.  For every bolt type there will be a relationship between the extension and the induced load so, measuring the extension allows accurate calculation of ...

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An end to over-bolting? [Part 1]

The aerospace sector, like most manufacturers, have traditionally used more, or larger bolts, than is strictly necessary in their assembly, in order to offset the effect of poor control of the bolted joint.  With ever increasing pressure to design lighter structures to increase fuel efficiency, this practice is fast becoming obsolete.    Over-bolting is not confined to the aerospace sector. Even the humble car wheel uses four or five bolts to secure the wheel, when in reality the job could be done with fewer and smaller bolts if greater control was applied. This reduced un-sprung weight of the car would also, as a result, improve the acceleration, braking and ride quality of the car. Similarly, in the aircraft industry, the cost of over-design, particularly its effect on fuel efficiency is even more noticeable. The rule of thumb is that a 1% weight reduction results in 0.75% reduction in fuel consumption; therefore a considerable saving potential. Over 80% of the fully laden take-of ...

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Two Become One!

Back in the late seventies or early eighties, walk into any engineering company in the UK and you would find rows of drawing boards each with an engineer beavering away with his or her set squares, Rotring pens and eraser shields. Most of these engineers would have been mechanical, with only a sprinkling of electrical engineers probably hidden away in a side office. These electronic engineers were a little different to those of today - electronic control was still fairly primitive. Remember this was the era of the mainframe computer sitting in a sterile office environment which generally only served the accounting side of the companies. The PC as we all know it did not really appear until the mid-80’s. There was of course electronic control but predominantly via relays, cam timers and drum sequencers that were bolted or affixed in some way onto the creations of the mechanical engineers. This was however all about to change forever; in 1968 General Motors in the USA decided that it wanted to replac ...

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Three Birds With One Stone

As part of our commitment to reduce Norbar’s carbon footprint we are planning to install solar panels on the roof of our Wildmere Road property. An initiative which could generate up to 500 kW of renewable electricity. We will be doing the work in association with a not for profit organisation called the Low Carbon Hub (LCH). The LCH is a social enterprise based in Oxford, with a core aim of reducing carbon emissions across Oxfordshire. It works alongside businesses, schools and local communities to install manage and maintain renewable energy technologies.   The LCH scheme is very neat. From a company perspective it provides an opportunity to reduce your carbon emissions, contribute to the local community and save money all in one go! It works by sharing the financial benefits from the government feed in tariff between the LCH investors who have provided the funding to install the solar panels (or other renewable scheme), the business whose roof (in the case of solar panels) is used to mount th ...

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Product Selector

Finding the correct torque tool for your specific application is essential to ensure torque is applied accurately and with maximum ease.

Use our Product Selector to find exactly the right Norbar tool for the job.

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Find a Distributor

There are Norbar companies in the UK, North America, Australia, New Zealand, Singapore, China and India, together with a network of specialist distributors in most countries.

Select any region on our world map for contact details.

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Download Catalogue

Details of Norbar’s extensive range of torque wrenches, multipliers and equipment for measurement and calibration can be downloaded in our comprehensive online product catalogue.

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Norbar Videos

Norbar’s collection of training videos.

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Norbar News & Updates

Read about Norbar’s news and developments in the UK and across our international network for the latest updates on the fascinating and fast-moving world of precision torque engineering.

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Download Our Apps

Norbar apps are available free for download on Android and iPhone and are invaluable tools for engineers.

Our Torque Unit Converter provides instant conversion across Metric, SI and Imperial units.

The Torque Extension app calculates the exact torque wrench setting value for required level of torque to be applied.

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FAQ

Precision torque engineering is a wide and complex field which is critical to many sectors of industry and poses many questions to those seeking information about its features and practical applications.

Here are some of the key queries we regularly encounter.

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Use Our Calculators

Norbar has devised easy-to-use online calculators that support the correct application of torque in three key areas:

  1. Unit conversion to assist international measurement definitions.
  2. Torque extension for setting correct values
  3. Torque tension to identify precise levels of torque to be applied for individual applications.

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