Surface Notes

Don’t be Fooled by Rvk!

The Rk parameters (Rk, Rpk, Rvk, Rmr1, Rmr2) are commonly used in the specification and control of plateau honing. However, there is a particular aspect of these parameters that can fool you… and it’s all about Rvk. Let’s take a step back and look at the plateau honing process. We start by honing a relatively

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camshaft measurement station with Digital Metrology’s ProfilerMaster software., courtesy of Chris Potter and COMP Cams

Finding performance—an Interview with Billy Godbold

Controlling surface texture requires graphical data—and teamwork You’ve seen that controlling surface texture offers huge benefits for performance and wear. You’ve made the investment in measurement equipment. So, is there any benefit in spending more money on additional analysis software? We asked one of the most successful people in motorsports to find out. Here’s a

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Rk parameters - the Rk surface texture parameters based on the material ratio curve may not be able to discern different texture on extremely plateaued surfaces, Rq parameters based on the material probability curve may be better

A Tale of Two Surfaces – Challenges with the Rk Parameters

Many of us have seen these pictures of surfaces that the average roughness parameter, Ra, cannot distinguish between:   However, you may not have seen different surfaces with the same values for the entire Rk family of parameters. For these Rk parameters: … we could have these two different surfaces: While the differences between these

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additive manufacturing, laser powder bed fusion, LPBF, surface texture, directional filters, NIST, Jason Fox

Analyzing additive surfaces with directional filters

When analyzing surface texture, we often need to separate specific features from the overall texture in order to analyze them. Isolating features from a complex background, however, isn’t always easy. Analyzing a surface created by laser powder bed fusion (LPBF) In laser powder bed fusion (LPBF), an additive manufacturing technique, components are built up layer-by-layer

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surface roughness- gemstone polishing - final polished agate

What does it take to make a stone look and feel great?

What makes a stone feel good in your hand? What magnitude of surface roughness is required for it to feel that way? We recently collaborated with stone enthusiast and retired metrologist Bob Rother to find out. Rother wanted to combine his passion for “rock hounding” with his background in process engineering and precision measurement to

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cylinder bore surface roughness

What’s In Your Cylinder Bore?

Engine cylinder bore surfaces are among the most “engineered” surfaces in the world. Millions and millions of hours (and dollars) have been spent on testing and optimizing these surfaces. And countless magazine and journal articles have been published on these surfaces. Despite these efforts, we find that there is no single, “one size fits all”

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Surface Texture Software - Dr. Jessica Arbour uses OmniSurf3D surface texture software for her studies in evolution and morphology

Surface roughness sheds light on how fish evolve

What can surface texture tell us about how biological communities evolve? Dr. Jessica Arbour and her team at Middle Tennessee State University studies differences in morphology (physical traits). Their goal is to better understand why some species “stay with one biological plan” while others explosively diversify into many new forms. Arbour has studied many different

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surface texture software - curved profile tool,omnisurf3d, digital metrology

New Curved Profile Tool in OmniSurf3D

Measuring texture along a linear path is a fairly straightforward process. A stylus-based measurement will do the trick. And, if we have areal (3D) measurement data, we can position a cursor on the path of interest and view it as a profile. But sometimes roughness matters along a curved path — perhaps along a ridge

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measure a chipped or worn cutting tool

Assessing a Chipped or Worn Tool Corner

As you may have seen in this video, analyzing a wear scar on your surface is fast and easy with OmniSurf3D… even when the scar occurs along a curved surface. However, what you may not know is that the OmniSurf3D wear analysis tool can also handle worn or  chipped corners as well. For example, let’s

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