Design and Development of a High Efficiency Air Turbine Spindle for Small-Part Machining

Paul Harris, Michael Wintterer, David Jasper, Barbara Linke, Christian Brecher, Stephen Spence

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Abstract

This paper reports on the development of a high efficiency and low inertia miniature pneumatic turbine for ultra-high-speed manufacturing spindle applications. It is proposed that radial-inflow/axial-outflow type turbines are well suited for micro-machining spindles. To validate the turbine performance potential, a proof-of-concept prototype turbo-spindle was developed and experimentally tested. The prototype spindle produced a net mechanical power output of over 60 W at a speed of 90,000 rpm. The experimental results demonstrate a micro-turbine efficiency of over 50% and a turbine power output of approximately 100 W. This compares to a typical turbine efficiency of around 20% in commercial micro-machining spindles. Further potential improvements to both turbine and spindle energy efficiency are outlined.
Original languageEnglish
Article numberJPGT-D-18-00095R2
JournalInternational Journal of Precision Engineering and Manufacturing-Green Technology
Early online date07 Jun 2019
DOIs
Publication statusEarly online date - 07 Jun 2019

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