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Norbar Blog


An end to over-bolting? [Part 1]

09 Mar, 2015 |
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 d...
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Three Birds With One Stone

05 Jan, 2015 |
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 comm...
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No matter what your profession, or the industry you work within, we encounter problems that are designed to test our ability to think outside the box. Yet, sometimes there are solutions that are both simple and elegant. I recently came across such an instance that I would like to share with you.  The issue is taking data from Norbar’s measuring instruments via RS-232 and getting the data in to the customer’s own software. Norbar already offers software to manage data, coming fro...
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It goes without saying that excellent customer service is a vital part of a successful business and at Norbar this is no different. In fact, we pride ourselves on delivering the very best service to our customers at every stage. We don’t just see the customer service team as a group of people who deal with complaints or who are called upon when people have an issue that needs resolving. Exceptional customer service starts from the first contact that is made with the customer to the last, a...
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Around 300,000 people in the UK suffer from Vibration White Finger (VWF) an industrial illness caused by the use of vibrating tools and equipment. Traditionally a miner’s disease, widespread use of modern vibrating apparatus means workers across other sectors are now being diagnosed.  The commercial vehicle industry is one such sector and concerns are being raised about how much is being done to fully protect staff in this area from the effects of VWF. Commercial vehicle garage worker...
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Torque and angle explained

05 Feb, 2014 |
If we asked a handful of maintenance engineers what exactly they are trying to achieve when they tighten a bolt, it’s likely that we’d receive a wide range of answers. Strictly speaking, when we tighten bolts, we’re trying to stretch the bolt enough so that the elastic tension within it clamps the assembly together. That’s right – it’s one that’s easier done than said! In a perfect world we would always recommend measuring the tension in the bolt, as opp...
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Torque wrench calibration

02 Jan, 2014 |
When it comes to torque wrench calibration, I often get asked ‘When should I re-calibrate my torque wrench? And should I wind it back to zero after use?’ In fact, these two questions might well be the most frequently asked of all frequently asked questions and are rightly a subject of genuine concern for production and quality managers. To misuse the old wartime propaganda slogan a little, ‘Careless torque can cost lives.’ When it comes to matters of recalibration, I...
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One of the more frequently asked questions from our customers is ‘how do I select the correct torque wrench for application?’Generally, most torque wrenches are used for tightening nuts and bolts accurately. Nuts and bolts need varying degrees of accuracy depending on the materials being fastened together, and therefore, there are different wrenches for different applications. The two main reasons why we use torque wrenches are to achieve the correct level of tightness and then ...
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Like most drivers I often take my car into a franchised dealership or an independent garage for a change of tyres. Usually, the mechanic removes and then replaces the wheel with a torque wrench. All generally goes well until the first click of the wrench which signifies that the nut has been tightened to its optimum torque. However, all too often in my experience the mechanic continues to tighten the nut beyond its optimum torque. In the past, I have counted two, three and even four clicks ...
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This might well be the most frequently asked of all frequently asked questions and is rightly a subject of genuine concern to production and quality managers. To answer the question, I am going to look to the standard BS EN ISO6789 - Assembly tools for screws and nuts - Hand torque tools. Requirements and test methods for design conformance testing, quality conformance testing and recalibration procedure. Unsurprisingly, most of us refer to it as ‘the torque wrench standard’&nbs...
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