Posted on 05/02/2014 By Norbar
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 opposed to the torque, because the tension is what we really need to know. In the real world, torque is the simplest way of achieving control in threaded fasteners but it is only an indicator of the tension.
Unfortunately there is no cheap, easy, reliable way to directly measure tension in a bolt but application of known torque gives sufficient control in the majority of situations.
It is widely accepted that the majority of torque we put into a threaded fastener goes into overcoming friction in the assembly as only between ...
Posted on 02/01/2014 By Norbar
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 always refer back 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”!
In 1992, ISO 6789 was very much a document covering the design and manufacture of torque tools and the requirement was that the tool should be tested at maximum capacity for 500 ...
Posted on 31/10/2013 By Norbar
After five years working as a sales manager in Lithuania and Latvia, I am now facing the challenge of being Business Development Manager at Norbar Torque Tools in Banbury, Oxfordshire, responsible for Russian speaking countries and the Baltic States.
While working in Lithuania and Latvia, I learned a lot about the ways of doing business in both Baltic and Russian cultures. In the last 8 months I have acquired plenty of experience travelling in Russian speaking countries - particularly Russia, Belarus and Kazakhstan. The knowledge I have gained here has been fascinating and sometimes very challenging.
Take for example the business dinner (which in my opinion is one of the most important parts of my work). What do you think the dress code is there? Pretty formal? No. In Russian and Baltic cultures there are no dress codes! People can come to a business dinner just wearing shorts and t-shirt and feel very relaxed about that. However, if it is your first meeting, or a meeting with the board, they wou ...
Posted on 02/10/2013 By Norbar
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 to ensure consistency across all of the bolts in the assembly. Used properly, a torque wrench will ensure that all bolts have the same level of torque applied. The effect of badly tightened bolts can be seen in lost time and money. It’s also worth noting that careless torque can cost lives.
The most common torque wrench is called a click wrench. This wrench is used to tighten bolts and nuts and will indicate when a pre-set torque has been reached. The pre-set value can be set by the user, or by a quality control ...
Posted on 27/08/2013 By Norbar
It’s been another few months since my last blog and again, plenty has changed on my apprentice journey at Norbar Torque Tools.
My second year is now complete and I’ve been working full-time over the summer on the shop floor. Safe to say, it’s been an eventful few months and I’ve been able to gain further valuable exposure into the day to day running of Norbar Torque in the UK.
In the past six months alone I’ve been placed in Goods In at both Norbar sites in Banbury, with the Stores team where jobs are prepared for processing, and then in the Torque Multipliers Department.
I’ve also recently completed my 10 week HNC manufacturing bridging course so I can take on the full version of the course that begins in September. I’ll be undertaking this one day per week at college over the next two years.
There’s a noticeable jump between second year and third year at college so I was grateful for the support and opportunity to take the bridging course – especi ...
Posted on 08/07/2013 By Norbar
Sam Ortolani is a torque specialist, based at Norbar Torque Tools Inc. over in the USA. Here he discusses the issues surrounding fake, counterfeit and cloned products in the automotive aftercare market.
We have all heard the stories about fake, counterfeit, and cloned products. Every few months another story makes the national news. Whether it is toothpaste that contains anti-freeze, or baby food that leaves dozens dead, or it is children’s toys that contain lead paint, these stories all emphasize one or two common threads. One, counterfeiting and cloning products is a big and fast growing business, and two, sometimes the results can be tragic.
Fake, counterfeit, and cloned products might be produced with the best of intentions, if we are liberal in applying doubt. More likely though, they are to be predatory – to bite into a market that some company spent years in order to become experts. To be sure, there is never a shortage of people who are lured by saving a few pennies in the spirit of bei ...
Posted on 01/05/2013 By Norbar
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”!
In 1992, ISO 6789 was very much a document covering the design and manufacture of torque tools and the requirement was that the tool should be tested at maximum capacity for 5000 cycles in each direction. No guidance was given on recalibration intervals.
However, when the standard was revised to the 2003 edition, the scope was broadened to include “quality conformance testing and recalibration” and so became of relevance to people using torque wrenches ra ...
Posted on 05/04/2013 By Norbar
For the many of you who probably don’t know, Norbar is a family owned and run business. Whilst in 2012 we have quite the global reach, we did have more humble beginnings. How does that phrase go again? “You don’t know where you’re going until you know where you’ve been”? Well, here’s a potted history of our life so far…
In 1942, at the height of World War 2, Bill Brodey was engaged in selling various tools and machines including Joseph Sunnen honing machines used for honing cylinder bores of engines. Torque wrenches were already being imported and sold alongside the honing so it was smart business sense (supply and demand) when Bill and his friend Ernest Thornitt applied to the UK Ministry of Supply requesting permission to manufacture torque wrenches in the UK.
Torque wrenches were very much in demand for the manufacture of Rolls Royce Merlin aero engines and the UK Government was keen to manufacture in the UK wherever possible to reduce pressure on t ...