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News

Air turbine delivers 30,000 rpm through high speed machining

ITC Tooling : 17 November, 2004  (Application Story)
To gain an additional high speed resource and increase the range of its new Depojet 1208 machining centre, Tarpey-Harris the company has invested in an Air Turbine Tools 250XJS 30,000 rpm high speed unit supplied by Industrial Tooling Corporation.
The benefits of high spindle speeds in mould and die applications are well known. However the cost of high speed machining centre prohibits many companies from employing this technology. Tarpey-Harris Ltd, who have invested over 300K in the last year in new machine tools, design and manufacturer mould tooling and gauging systems for several industries. To gain an additional high speed resource and increase the range of its new Depojet 1208 machining centre the company has invested in an Air Turbine Tools 250XJS - 30,000 rpm high speed unit supplied by Industrial Tooling Corporation Ltd. The new unit has been a great success paying for itself in the first job as Anthony Harris, Works Director, outlined.

'When we invested in the Depojet 1208 we wanted the capability of a large tool making machining centre but also a platform for high speed machining operations too. The Depojet features a manually positioned universal head which can mounted on the main machine spindle housing in minutes, allowing the air turbine to be mounted and positioned at virtually any angle. The machine spindle is blanked off with a spindle tool and a new datum position established. The compact design of the ATT spindle permits accurate collision free machining of deep cavities. With only an air line to connect, set up and removal takes just a few minutes. We have easily achieved 10 micron limits in aluminium wax dies and 5 micron limits in hardened steels using 1mm dia ball nose cutters - with excellent surface finishes. We have also had good results running the spindle unmanned overnight - we operate NC Graphics and check our mould cavities with a DEA, CMM.'

The ATT spindle develops 1.4 HP (1.1kW), features a low maintenance stainless steel body and sealed for life ceramic bearings. At 30,000 rpm the spindle delivers a smooth - vibration free cut while a governor ensures constant torque under load. A wide range of tapers including R8 and BT40 are available. Cutters up to 8mm in dia are held in a Swiss Regofix collet system. Being air driven it only requires a single connection to a clean oil free air supply, 90 psi - 6.2 bar.

Anthony Harris concluded: 'The ATT spindle has proved to be a highly successful low cost addition to our machining capability. It's simple, reliable and accurate.'
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