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Surface Finish Metrology


Pat Nugent is currently the Vice President of Metrology Systems for Mahr Federal Inc. He has been with the Mahr group since 1998 and has held the current position since 2002. Prior to this, he worked at the Mahr group headquarters in Goettingen, Germany in several different positions. In his current position he is responsible for the Metrology Systems product line of the Mahr Group throughout North America and is located at the US headquarters of Mahr Federal in Providence, RI. Prior to joining Mahr, Mr. Nugent worked at Cummins Engine Co. from 1989 to 1998 in the Corporate Metrology and later in the Fuel System Metrology and Quality groups. Mr. Nugent holds a BS in Mechanical Engineering and an MS in Manufacturing Systems Engineering, both from the University of Wisconsin – Madison.

In addition to his work at Mahr, he is a member of a number of ASME B89 committees working on standards for Form measurement (roundness, cylindricity, straightness, and flatness) as well as committees on the measurement of Internal and External standards (ring gages and plug gages).

Session Title: Introduction to Contact Methods in Surface Finish Metrology

Surface Finish, or Surface Texture, is one of the most commonly measured characteristics during the manufacture of many products. Most modern products have surfaces with stringent requirements for the quality of the surfaces. These requirements may be purely cosmetic in nature or may be for surfaces that have been engineered to perform a specific function, such as having minimum friction. To understand what we typically measure today, we will look at a short history of the development of surface finish metrology over the years and see what has been measured in the past and how current methods have evolved from that. The most typical measurement methodology currently in everyday use is that of a contact stylus used to profile the surface. These instruments fall into two main categories, and how to classify an instrument will be discussed as well as which categories of instrument can be used for which types of measurements. Most measurements require the filtering of data and typical filters will be presented and discussed as well as the differences one might expect to see when using each of these.  In addition, the relationship of the surface finish to other parameters such as form tolerances will be examined. Setting up a proper measurement with a typical stylus instrument involves not only choosing the right instrument, but also the right filters and probes. How to make sure that these are correctly chosen will be discussed. Surface finish is often thought of simply as “roughness” or how smooth a surface is. However, this is a simplified view of what is actually possible to measure. A wide variety of parameters have been standardized to characterize the quality of a surface. A discussion of some of these alternatives to a typical roughness (Ra), how they are calculated, and what they represent will form the conclusion of the presentation.

Session Date and Time

Wednesday January 23, Afternoon (Half Day) 1:00pm - 5:00pm


Please mail/fax/email the completed registration form and payment to:

Dr. Chittaranjan Sahay (Director)
Center for Manufacturing and Metrology
College of Engineering, Technology, and Architecture
University of Hartford
200 Bloomfield Avenue, West Hartford CT 06117


Fax: 860.768.5073

Phone 860.768.4852


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