Cook, N. J. (Nicholas John), Smith, Gordon F. and Maggs, Steven 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. doi:10.1109/TASE.2007.894725 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, Engineering and Medicine > Engineering > 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
Dates:	Date Event April 2008 Published
Volume:	Vol.5
Number:	No.2
Number of Pages:	7
Page Range:	pp. 216-222
DOI:	10.1109/TASE.2007.894725
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access

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