Don Cohen decribes Michigan Metrology’s contract measurement services, measurement consulting, and surface roughness/wear/tribology training classes. Learn how Michigan Metrology can help you solve issues related to leaks, squeaks, friction, wear,

If you rely on average roughness (Ra) to control your surfaces, check out this short animation. It shows that very different surfaces can all have the same Ra value…and Ra

It’s easy to recognize a summer day just by the sounds: bird calls, trees rustling, kids playing…maybe lawn mowers and leaf blowers…Somehow, our brains process all that information as “summer.” 

In the world of surface texture, we talk about the size of the features that might impact an application. We use terms like form, waviness, and roughness to talk about

When we think of surface roughness, we often think of machined surfaces. But 3D optical measurement is also essential for controlling much more polished surfaces, such as optical components. Over

3D surface texture impacts friction, wear, and many other functions. In this video we look at 3D surface roughness measurement of automotive engine valves. These small parts have several critical

3D surface texture impacts friction, wear, and many other functions. This video looks at 3D surface roughness measurement of clutch plates. We look at how these surfaces can be tuned

Surface texture on medical devices affects many aspects of performance: how well an implant will bond to tissue, how blood will move over a device without clotting, how well a

 The May 2026 class is now FULL. Please contact us if you’d like us to inform you about upcoming classes. You may also want to check out the online classes. Dr. Donald Cohen’s

3D surface texture measurement shows us a lot about a surface and how it will function. In this video series we show you how 3D measurement works and all we

3D surface texture measurement shows us a lot about a surface and how it will function. In this new video series we show you how 3D measurement works and all

We’re excited to kick off a new series of free, in-person seminars covering surface texture measurement, analysis, and application! Seminar 1: Creating surfaces with “high quality” look and feel Join

If you work with precision surfaces, you’ve most likely encountered callouts for surface roughness/surface texture. At first glance, roughness may seem straightforward…you run a roughness gage over a surface, it

Surface texture plays a major role in sealing. But just making a surface “rougher” or “smoother” may not improve how well your surfaces seal. Interested in a deep dive into