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 26th ASPE Annual Meeting

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Dear Colleague:

This past month we completed the Spring Topical Meeting on Structured and Freeform Surfaces. Co-organized with euspen, the meeting was international with Asia, Europe and the Americas all well represented. The response was overwhelming. The original plan for 70 attendees was expanded to 100 and even then people were turned away for lack of meeting space. A total of 40 papers, including 13 poster papers and 2 tutorials were presented. A meeting highlight was a tour of the University of North Carolina at Charlotte precision engineering facilities. UNCC were excellent hosts and we want to thank them for their hospitality, and hard work supporting this conference.

Now we are turning our attention to our Annual Meeting. It is being held in Denver, CO on November 13th to 18th.

The Annual Meeting takes a broad systems approach. Papers are presented across the breadth of precision engineering, encompassing manufacturing processes, metrology tools, controls, environmental effects, materials, standards and other related disciplines.

This is your best opportunity to:

Present your latest developments in precision engineering concepts and technology

Learn from other’s research presentations

Network with international experts from industry, academia and government labs

Increase your knowledge through in-depth tutorials

Discuss your needs with manufacturers showcasing their latest technology and try them out with your most challenging parts.

Denver is a beautiful city on the front range of the Rocky Mountains. The Denver Annual Meeting offers you an opportunity to learn, grow professionally, expand your network, and enjoy a time to rejuvenate in the many recreational activities within and near the city.

I look forward to hearing from you and seeing you at an ASPE meeting in 2011.
Tom Dow, Executive Director

PATTERN #4: ABBE (ALIGNMENT) PRINCIPLE*

Precision manufacturing requires predictable motions. Predictable motions require moving to an expected location as controlled by a measurement scale. Unwanted angular motions along with a desired linear motion will occur in moving elements. These angular motions affect the accuracy of predicting the position of the linear motion. Angular motion affects are magnified if the line of motion is offset from the axis of the measurement scale. The offset between where the measurement is made and the machine/instrument action occurs is called the Abbe-Offset.

Machine/instrument performance is maximized when the motion axis and the measurement scale axis are collinear, or when the Abbe-Offset is zero.

PATTERN #4:


Make the measurement and motion axes collinear whenever possible or,

Design to minimize the offset between the measurement scale axis and the motion axis of the corresponding stage or,

Offset the measurement axis in the direction having minimal influence.

Next pattern: METROLOGY FRAME

*Based on "Patterns for Precision Instrument Design", a classic ASPE tutorial by C. Teague, C. Evans and later D. Swyt. It uniquely identifies 12 foundational mechanical concepts or patterns driving precision in fabrication, assembly and metrology.


The American Society for Precision Engineering promotes the future of manufacturing in America by advancing precision engineering; though supporting education; and encouraging the development and application of precision principles.

ASPE, founded in 1986, is a non-profit organization.

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