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SpecialtyFasteners UPDATE The clock for machine guard compliance is ticking... Since 2009, EC Machinery Directive 2006/42/EC has specified that all fasteners on machine guards must be captive. If you have not complied by the end of 2011, you will be in contravention of the directive and will therefore be operating illegally. You must replace loose fasteners with captive bolts and captive quick-release fasteners. Fortunately, Specialty Fasteners have a range of these products to help you meet the directive criteria. But if you are uncertain of what to do, SFC have a team of applications engineers who will be pleased to consult with you and advise on your situation. Meet the regulations now – the compliance clock is ticking ... Call an SFC engineer today on 0 1 8 0 3 8 6 8 6 7 7 to discuss your guarding problem or application wwwwww..ssppeecciiaallttyy--ffaasstteenneerrss..ccoo..uukk//AAdd11 ENGINEERED SOLUTIONS FROM SPECIALTY FASTENERS & COMPONENTS Specialty Fasteners & Components Ltd Seymour Wharf, Steamer Quay Road, Totnes, Devon TQ9 5AL Tel: 01803 868677 Email: sales@specialty-fasteners.co.uk CAPTIVE BOLT 15 DECEMBER 2011 CAMLOC CAPTIVE 1/4 TURN FASTENER SEE MORE SOLUTIONS TO YOUR FASTENING PROBLEMS AT www.specialty-fasteners.co.uk
Fasteners deployed in key military applications The value of research and development capability AppliTEC, and the engineered properties of EJOT’s Delta PT thermoplastics fastener have made a significant contribution in the development of new ‘threat detection’ equipment now being produced in the UK for military personnel. Design engineers working on the manufacture of intricate equipment like proximity sensors for armaments and mobile monitoring systems are faced with the demand to produce smaller, lighter units. Yet the very nature of these applications means that there can be no compromise to performance and durability; in fact an increase of the latter is obviously key to the manufacturer’s successful pitch. Delta PT has made a significant contribution in the development of threat detection equipment for military personnel Traditionally, manufacturing for such applications has relied almost entirely on conventional nut and bolt engineering but as the military theatre demands more mobility and increased efficiency, parts reduction in the manufacturing process has become highly significant. The core design of the Delta PT originates from automotive assembly design and was specially developed for screw joints in thermoplastic materials. The thread geometry creates low surface pressure and provides for a high clamp force within the finished assembly. It is the evolution of these properties that has allowed application engineers to promote the screws values to designers who have been challenged to meet the very ‘size versus strength’ issues highlighted. When looking for increased resistance to vibration, better electrical insulation and overall parts and cost reduction, designers were forced to investigate a 2mm screw requiring an insert of 6mm diameter plus boss of 10mm diameter. Once clamping loads were established, application engineers were able to deploy an online prognosis program, DeltaCALC, taking the proposed Delta PT’s small dimensioning to forecast its load carrying capabilities. Calculations proved that because the screw fully engaged in the thread it was forming, the team was able to go one step further and demonstrate that a 1.6mm Delta PT not only withstood vibration more efficiently but reduced the boss diameter down to just 4mm, as the insert was removed entirely. Conductivity trials were also made at this stage of development, showing that any electro static discharge stopped at the screw as the plastic bosses operated as an insulator thus effectively protecting the electronic components. Of equal significance for the development engineers, was the fact that the online prognosis had itself eliminated a test run schedule budgeted and approved at a cost of over £200,000. FAST OCTOBER 2011 FASTTOP TIPS DeltaCALC is a prognosis program which can forecast the load carrying capabilities of the thermoplastics fastener EJOT’s application engineer for the project, Malcolm Akers commented: “The contribution of our AppliTEC technology has been to prove quickly and quantifiably the effectiveness of a 1.6mm Delta PT that has reduced the number of components required for assembly, and thereby the overall cost of assembly. The very nature of the screws design means direct fix fastening has created a stronger joint capable of higher resistance to vibration whilst providing higher electrical insulation.” EJOT 01977 687090 51
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