Norbar is offering three lucky winners a free torque wrench calibration.
In the previous issue, Norbar Torque Tools outlined the key changes to the new BS EN ISO 6789:2017 standard, ‘Assembly tools for screws and nuts – hand torque tools’. Here, Philip Brodey, Sales Director at Norbar Torque Tools, explores some of the challenges these revisions have brought, as well as introducing the Torque Wrench Calibrator Auto – a system that enables users to perform their own torque wrench testing and calibration in accordance with the new standard.
It is anticipated that most fleet operators will not perform the calibration of their own torque wrenches, nonetheless, it is only fair and prudent to be aware of the changes to ISO 6789 and their impact. This will enable fleet operators to make an informed decision with regard to the calibration of their torque wrenches and the services and equipment they employ to this end.
From April 2019, all UKAS accredited laboratories offering a torque calibration service will have to be ISO6789-2:2017 compliant or they will not be allowed to perform calibrations. However, one of the key challenges is that despite not making it known to their customers, many providers are not offering the same service. In fact, many laboratories and torque wrench repair companies are continuing to call the document they produce a ‘Calibration Certificate’, even if it would not be regarded as such under the new standard.
It is unlikely that these companies are trying to be deceitful, as they could be working to an earlier issue of the standard, but the problem is that many customers will not understand the distinction. Even those claiming to be working to Part 1 and/or Part 2 of the revised standard may not be, and there is a shortage of auditors internationally to monitor this.
The repercussions of using an incorrectly calibrated tool are potentially catastrophic, with wrongly applied torque being a key contributor to incidents, such as wheel detachments. This can occur by either exceeding the torque value in the manufacturer’s specification, which causes the bolts to stretch and eventually break, or by under torquing, causing them to come loose.
The answer, therefore, has to be to educate customers about the importance of only working with those that are compliant with the new standard. Some may see it purely as a piece of paper on file, or a price hike, but most customers will care that the calibration of their torque tools is done correctly and that a ‘calibration’ truly is a ‘calibration’, particularly in an industry like this one.
Operators in the Norbar laboratory are able to calibrate all makes of torque wrenches and screwdrivers within its scope of UKAS accreditation, from 0.1 N⋅m to 3,000 N⋅m, with the lowest uncertainty rate currently available in the UK – 0.17%.
An in-house option
Alternatively, for those wanting to perform their own calibration to the standard, Norbar’s latest Torque Wrench Calibrator Auto (TWC Auto) enables accurate and efficient testing and calibrations of click, dial and electronic torque wrench designs, in accordance to the ISO6789:2017. As stipulated by the 2017 version of the
standard, parasitic forces within the calibration system must now be eliminated. With this in mind, Norbar’s TWC features a patented counterbalanced reaction, which helps achieve the required self-alignment and balances out the weight of the wrench, so that it does not become a parasitic force in the system. The rotating transducer design also ensures the load is applied at 90° to the torque wrench handle for unbeaten precision.
The 2017 standard also goes further is in the rate of torque application. Previous issues of the standard defined one torque application rate, but there are now four, depending on the level of torque being applied. For example, for a torque application of ≥10 and <100 N⋅m, the last 20% of the torque should be applied for a minimum of 1 second, but for torques in the range ≥100 and <1,000 N⋅m this rises to 1.5 seconds.
This is possible to achieve by using a manual loader, but is by no means fool proof. Norbar’s Manual TWC, coupled with a T-Box XL instrument running the latest version of the operating software, will flag any torque application rate that does not comply. Taking this further, the TWC Auto version will always guarantee the correct rate of torque application over the last 20%, while ensuring that the first 80% of torque application is achieved rapidly to improve calibration throughput.
However, it is in the data gathering for the purpose of establishing the calibration uncertainty that the TWC Auto offers its biggest benefit to users. The TWC Auto will guide the technician, even non-expert users, through the process of gathering this data and will then calculate the uncertainty budget to be included within the calibration certificate.
The TWC Auto also comes with a touchscreen user interface, as well as a flexible tool template system to minimise the number of templates required to cover a wide range of tools.
In addition, the TWC Auto benefits from a job management system for booking calibrations and recording the progress of previous jobs, helping workshops to keep track of multiple vehicles. The intelligent rate control system guarantees fast cycling of tools, all while the inbuilt data analysis and certification generation seamlessly moves from calibration/conformance procedures to certificate generation.
Regardless of whether fleet operators conduct their own torque wrench calibrations or not, by being aware of the new standard and its implications, fleet operators can make an informed choice as to how, and with whom, their torque wrenches are calibrated in the future.
Norbar is offering three lucky winners a free torque wrench calibration. This will cover pickup and delivery, the calibration service of the entrant’s chosen torque wrench, and the delivery of the tool back to the winner.
To be in with a chance of winning this great prize, all you have to do is answer the following question (the answer to which can be found in this article):
Deadline for entries is 10/01/2019.
- TNT will collect from a UK work address on any weekday between 9am and 5:30pm.
- The tool would need to be boxed and labelled ready for collection.
- Norbar will then book the collection from the winners addresses over the phone. Delivery to Norbar (Banbury) would be the following day. Booking collection from Norbar for delivery back to the winner would be done online by Norbar. Winners will then be contacted with a delivery slot and a tracking reference. The cost of both collection from the winner and delivery back to the winner will therefore be covered by Norbar.
- Delivery/collection lead times from Belfast and Scottish Highlands is a two day transit, not next day.