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A novel multipin positioning system for the generation of high-resolution 3-D profiles by pin-arrays

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Cook, N. J. (Nicholas John), Smith, Gordon F. and Maggs, S. J.. (2008) A novel multipin positioning system for the generation of high-resolution 3-D profiles by pin-arrays. IEEE Transactions on Automation Science and Engineering, Vol.5 (No.2). pp. 216-222. ISSN 1545-5955

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Abstract

This paper extends pin-tool research by investigating a new method to accurately position high-fidelity pins in an array, with each pin uniquely positioned under computer control. The resultant tool is a reusable prototyping system for the rapid generation of three-dimension (3-D) profiles using CAD extracted data, with application potential in a variety of manufacturing processes. A control assessment identifies a combination of array-addressing, latching positioning hardware, and a combined "setting platen" pin-position feedback and drive as an appropriate technique for pin control. The novel platen motion strategy is capable of moving thousands of pins with a single drive motor. The system incorporates latching "locks" that operate on the "tail" of a new two-part "header and tail" pin design. Key to the lock strategy is the application of shape memory alloy actuators in a back-to-back configuration; the response of this material to electrical input is quantified and applied to achieve the unique lock design. Multiple locks combined into a demonstrator position headers to an accuracy of +0.09 -0.05 mm. The mounting pitch of the prototype system permits the use of 1.0 mm section pins. An extension to the design ultimately allows a 15 000 pin-array to be positioned in similar to 3 min.

Note to Practitioners-This research was motivated by the apparent lack of a technique to uniquely position small section pins in an array, without a bulky control system, power limitations, or motion system restrictions. Prior approaches to positioning pins in an array have used multiplexed or sequential control on pins of 6 mm section or larger. This research investigates a combined control system/hardware approach applied to pins of 1 mm square section, scalable to move thousands of pins uniquely. The presented novel solutions generate a higher fidelity surface definition than previous systems. Extending existing research on surface-smoothing interpolators that reduce the "staircase" effect generated by discrete pins would be beneficial.

Item Type: Journal Article
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
T Technology > TS Manufactures
Divisions: Faculty of Science > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH): Pins (Engineering) -- Research, High-fidelity sound systems, Rapid prototyping, Three-dimensional imaging
Journal or Publication Title: IEEE Transactions on Automation Science and Engineering
Publisher: IEEE
ISSN: 1545-5955
Official Date: April 2008
Volume: Vol.5
Number: No.2
Number of Pages: 7
Page Range: pp. 216-222
Identification Number: 10.1109/TASE.2007.894725
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
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URI: http://wrap.warwick.ac.uk/id/eprint/29586

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