Welcome to the Surface Roughness Analysis Blog
Why do brakes squeak? When will a gasket leak? What caused the haziness in my painted finish?
Surface texture and function are tightly linked. Understanding the relationship between texture and function, and sharing that information with engineers and quality professionals, is what Michigan Metrology is all about.
The articles in this blog explore the concepts of surface texture analysis and measurement. We show how you can apply these concepts to solve problems related to leaks, squeaks, appearance, wear, noise, fit, friction, vibration, adhesion, and many other functions.
Looking for more information on specific surface texture parameters? Visit our Surface Texture Parameters Glossary for an introduction to dozens of 3D surface roughness analysis parameters.
And, if you want to learn much more about surface texture consider attending our online and in-person classes for an immersive introduction to the many concepts in surface analysis.
Scoring, scuffing, and galling
August 2, 2022So many wear mechanisms…so many definitions “Wear” is the progressive modification to a surface. It may result in a loss, deposit, or redistribution of material[1]. Quantifying different types of wear
Friction and Wear of Materials
July 25, 2022For those of you who have taken my class, you know that this is an important resource for me. Ernest Rabinowicz really pioneered our understanding of friction and wear, both
The “leaks and squeaks” images
July 18, 2022Over the years we’ve shown these images frequently on our website (which has just been updated, by the way!). Taken together, they sum up the kinds of issues we see—and
Bandpass and Notch Filters
July 11, 2022It’s a regular refrain on this blog: surface texture consists of a spectrum of spatial wavelengths, ranging from shorter spatial-wavelength roughness through longer spatial-wavelength waviness and form. Through the process
Celebrating Floyd Firestone
July 5, 2022Floyd Alburn Firestone was an acoustical physicist with wide-ranging talents, with important contributions in fields including acoustics, non-destructive testing, medicine, and surface texture. He is remembered as developing the first
Micro vs macro lead
June 28, 2022Rotary lip seals create a boundary around shafts in rotary equipment, typically to retain lubricant on one side versus air or gas on the other. On first consideration, it would
Ra changes when the cutoff changes
June 21, 2022The Roughness Average, or average roughness parameter, Ra, is the average of the surface heights of every point along the “roughness profile.” Its equivalent for areal (3D) measurements is the
The Surface Texture Answer Book
June 15, 2022I’ve been working with surface roughness for over 30 years…yet I am always looking for ways to expand my knowledge. This book has been in heavy rotation for me since
Can stylus and optical measurements correlate?
June 8, 2022Many companies use both stylus and optical measurement technologies to measure surface texture. A question that we are often asked is, “Can the measurements between these different systems correlate, and
Why stitch surface texture data?
June 1, 2022How would you go about measuring these coins? In terms of value, the most precious would likely depend upon your age, and possibly the time left on your parking meter!
Smoother is better…?
May 25, 2022It’s a common intuition that smoother surface texture is “better” for rotating or sliding over another component. It seems natural that a smoother surface would wear less, have lower friction,
What is the F-Operator (and why can’t I find it on my machine)?
May 18, 2022You may have heard the term “F-Operator” and wondered what it is, and how it’s used. As we mention often, surface texture consists of a spectrum of spatial wavelengths, ranging