Long-stroke fast tool servo and a tool setting method for freeform optics fabrication

Abstract. Diamond turning assisted by fast tool servo is of high efficiency for the fabrication of freeform optics. This paper describes a long-stroke fast tool servo to obtain a large-amplitude tool motion. It has the advantage of low cost and higher stiffness and natural frequency than other flexure-based long-stroke fast tool servo systems. The fast tool servo is actuated by a voice coil motor and guided by a flexure-hinge structure. Open-loop and close-loop control tests are conducted on the testing platform. While fast tool servo system is an additional motion axis for a diamond turning machine, a tool center adjustment method is described to confirm tool center position in the machine tool coordinate system when the fast tool servo system is fixed on the diamond turning machine. Last, a sinusoidal surface is machined and the results demonstrate that the tool adjustment method is efficient and precise for a flexure-based fast tool servo system, and the fast tool servo system works well on the fabrication of freeform optics.

[1]  Thomas A. Dow,et al.  Design tools for freeform optics , 2005, SPIE Optics + Photonics.

[2]  Stephen Joseph Ludwick.  A rotary fast tool servo for diamond turning of asymmetric optics , 1999 .

[3]  Wei Gao,et al.  Fast Positioning of Cutting Tool by a Voice Coil Actuator for Micro-Lens Fabrication , 2009, Int. J. Autom. Technol..

[4]  Mahmudur Rahman,et al.  A fine tool servo system for global position error compensation for a miniature ultra-precision lathe , 2007 .

[5]  Young-bong Bang,et al.  Fabrication of free-form surfaces using a long-stroke fast tool servo and corrective figuring with on-machine measurement , 2009 .

[6]  Richard M. Seugling,et al.  An uncertainty analysis of tool setting methods for a precision lathe with a B-axis rotary table , 2010 .

[7]  Nathan P Buescher.  Live Axis Turning , 2005 .

[8]  A. Tünnermann,et al.  Freeform manufacturing of a microoptical lens array on a steep curved substrate by use of a voice coil fast tool servo. , 2011, Optics express.

[9]  Haiyang Zhang,et al.  The influence of process parameters on the surface topography in diamond turning of freeform optics , 2010, 2010 International Conference on Mechanic Automation and Control Engineering.

[10]  E. B. Magrab,et al.  Design and testing of a fast tool servo for diamond turning , 1985 .

[11]  D. Lucca,et al.  Surfaces in Precision Engineering, Microengineering and Nanotechnology , 2003 .

[12]  Erik Mark Zdanowicz.  Design of a Fast Long Range Actuator - FLORA II , 2009 .

[13]  Marten F Byl,et al.  Design and control of a long stroke fast tool servo , 2005 .

[14]  Harry A. Atwater,et al.  Highly efficient GaAs solar cells by limiting light emission angle , 2013, Light: Science & Applications.

[15]  David Anthony Chargin.  Rotary fast tool servo component design , 1999 .

[16]  R L Hibbard,et al.  A flexure-based tool holder for sub-μm positioning of a single point cutting tool on a four-axis lathe , 2005 .

[17]  Guipeng Tie,et al.  Fabrication of off-axis aspheric surfaces using a slow tool servo , 2011 .

[18]  James F. Cuttino,et al.  Design and testing of a long-range, precision fast tool servo system for diamond turning , 2009 .

[19]  Yasser M. Sabry,et al.  Silicon micromirrors with three-dimensional curvature enabling lensless efficient coupling of free-space light , 2013, Light: Science & Applications.

[20]  Yang Gao,et al.  Simultaneous additive and subtractive three-dimensional nanofabrication using integrated two-photon polymerization and multiphoton ablation , 2012, Light: Science & Applications.

[21]  Matthew J. Bono,et al.  Tool setting on a B-axis rotary table of a precision lathe , 2008 .

[22]  Ho-Sang Kim,et al.  Feed-forward control of fast tool servo for real-time correction of spindle error in diamond turning of flat surfaces , 2003 .