Roughness Measurements - Let's Take A Closer Look

Surface roughness, a critical parameter in manufacturing, influences component functionality, durability, and aesthetic appeal. Defined by form, waviness, and roughness, these elements must be accurately separated to assess surface quality. Rough surfaces can increase friction, reduce lubrication efficiency, and accelerate wear, while smoother surfaces enhance performance and longevity. For components like seals and valves, improper roughness can compromise fluid or gas retention and cause leaks. Additionally, rough surfaces are prone to corrosion and can detract from a product’s appearance and perceived quality.

Accurate roughness measurement begins with separating form and waviness from the finer roughness details. Advanced 3D optical profilers, like Zygo’s, utilizing Coherence Scanning Interferometry (CSI), make this process precise and efficient. Profilers enable the isolation of roughness by using high-resolution objectives and sophisticated software, such as Zygo’s Mx platform. Features like Part Finder and Smart Setup simplify setup and adjustment, ensuring consistent results. Parameters like field-of-view, working distance, and lateral resolution further refine data accuracy.

Processing the collected data involves removing form and waviness through filters based on spacing, not height. Standards such as ISO and ASME/ANSI guide filter selection for accurate roughness isolation. For example, in sealing surfaces, tilt removal and high-pass filtering ensure proper analysis of functional roughness.

By leveraging these tools, manufacturers can meet design specifications, improve durability, and ensure optimal product performance. Zygo’s 3D profilers, equipped with advanced features, are ideal for achieving precise roughness measurements, critical for various industries.