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Proceedings Paper

Smart spindle unit for active chatter suppression of a milling machine: I. Overview, fabrication and assembly
Author(s): Natarajan Shankar; Keith Bridger; Mark E. Regelbrugge; W. R. Winfough
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Paper Abstract

This paper describes a Smart Spindle Unit (SSU) integrated with Ingersoll's Horizontal Octahedral Hexapod Machine for providing active chatter suppression during milling operations.Fabrication of actuator and sensor components and integration of those components into the SSU will be described in detail. The SSU has a hydrostatically supported spindle cartridge. This cartridge can be moved in directions orthogonal to the axis of rotation of the spindle by using four electrostrictive actuator/force sensor assemblies. Tool tip vibration is sensed by strain gages located at the root of the tool. These measurements are transmitted off the rotating spindle by frequency modulated radio transmissions which are captured by a demodulating receiver and then converted to the non-rotating coordinate system of the actuators. Displacement sensors located on the spindle housing will also be used to monitor motion of the outer bearing race during operation. A model based DSP controller will be used to drive the actuators which will dynamically stiffen tool tip motion thus suppressing chatter during milling operations.

Paper Details

Date Published: 16 June 1998
PDF: 7 pages
Proc. SPIE 3326, Smart Structures and Materials 1998: Industrial and Commercial Applications of Smart Structures Technologies, (16 June 1998); doi: 10.1117/12.310630
Show Author Affiliations
Natarajan Shankar, Lockheed Martin Missiles & Space (United States)
Keith Bridger, Active Signal Technologies Inc. (United States)
Mark E. Regelbrugge, Lockheed Martin Missiles & Space (United States)
W. R. Winfough, Ingersoll Milling Machine Co. (United States)

Published in SPIE Proceedings Vol. 3326:
Smart Structures and Materials 1998: Industrial and Commercial Applications of Smart Structures Technologies
Janet M. Sater, Editor(s)

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