Kingston Engineering buys a Leistritz whirling machine

1 min read

Kingston Engineering has installed a Leistritz LWN 160.6000 whirling machine at its factory in Hull.

It will be used to machine trapezoidal or acme thread lead screws, custom threads and ball screws. The firm says it's been a "necessary purchase" to cope with the rising demand for shorter delivery times without compromised quality. The thread surface achievable on the machine varies from 0.02 Ra with a new insert to 0.08 Ra with a re-ground insert - these values are similar to surface roughness that can be achieved on a grinding machine. The Leistritz LWN 160.6000 is capable of machining shafts with diameters from 15 up to 120 mm and 6 m in length. It has very short cycle times and nine CNC axes, four of which are for bar support. The whirling rings have four or six holders for tungsten carbide inserts, which allows the processing of mild, alloy and highly alloyed steel including stainless. Overheating and deformation are avoided because the machine has an air cooling gun. All guideways are automatically lubricated too. It even has a track finding and pitch measuring system with 'auto resume' of the thread machining point, made possible by a Marposs probe. This prevents unsightly and difficult imperfections and the possibility of pitch error, which can be difficult for the correct assembly of the lead screw with the nut. The firm says the new whirling machine will enable it to produce the highest quality lead screws for its customers and to develop new markets. It recently produced screw threads to power the retractable fuel probe on the Saab Gripen fast jet.