FASTENERS & SEALINGS
Dryspin technology optimises the interaction between the leadscrew and polymer threaded nut
NEAR SILENT OPERATION Alongside its durability and efficiency credentials, dryspin leadscrew technology is also quieter than most conventional trapezoidal threads. This is due to the teeth being rounded rather than square, so the contact surface between the threaded nut and the screw is reduced. This leads to fewer vibrations and therefore minuses rattling or squeaking. “The tighter manufacturing
tolerance of the lead screws compared to DIN 103 7e also ensures more precise running behaviour and significantly higher speeds in the application,” Day adds.
SUSTAINABILITY ADVANTAGES “The seven standard materials we use as lead screw nuts have been optimised to gve us the lowest coefficient of wear and friction possible,” Day continues. “And much like our bearing technology, it depends on the application as to which material and lead screw option is best suited to our customers.” Not only does dryspin offer
mechanical advantages over traditional lead screws, but it also delivers sustainability wins too, he says. “Both parts of the lead screw
are fully recyclable,” he explains. “The screws are also lubrication- free which means they require no maintenance and have a much longer life than traditional options.
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This means that we’re minimising waste, producing less parts, and reducing our carbon footprint.” The dryspin screw technology also
enables sustainability benefits within the lifecycle of products, too. “The leadscrews are also lightweight, so in a car for instance we are lowering the weight of parts that go in it and therefore helping to reduce the carbon footprint of those applications.”
MANUFACTURING CAPABILITIES Igus manufactures its lead screws using three methods. For standard products, the firm opts for injection moulding. For special parts or to customise a part to a customer’s design, CNC machining is another port of call. Thirdly, for rapid prototyping or proof-of-concept applications, the company can 3D print parts to aid in the design and specification of the lead screw system. “Customers can input their
application details, such as loads, speeds and so on, and our system will tell them the best material and pitch size for the application, as well as the predicted lifetime of the part and the drive requirements,” Day adds. “Once the customer has specified and designed the part, the details can be uploaded to our online shops where they will be provided with instant pricing and fast checkout. With our online tools, our sustainability and mechanical advantages, dryspin has been successful in many industries.”
ON THE RAILS
“One industry we have had a lot of success with our dryspin technology is the railway industry,” Day says. “Rail manufacturers need a reliable, robust solution that requires minimum maintenance, so with the help of our online design tools and our expert system, we are able to specify to correct parts to ensure they have a robust product that is reliable and has a predictable lifetime.” In particular, dryspin
technology has been successfully applied to improve a leading rail operator’s sliding step mechanism. Traditional sliding step mechanisms – which bridge the gap between the train and the platform to ensure safe boarding and alighting for passengers – often face problems such as sticking, misalignment and high maintenance costs. The use of Igus’ dryspin lead screw drives paired with its iglidur J nuts enabled the system to function without fault despite high temperature fluctuations and exposure to dirt and moisture. The simplified guidance system eliminated sticking while the maintenance-free design reduced life cycle costs.
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