3. Surface Roughness Parameters
What you'll learn
- Learn basic surface texture parameters (surface roughness parameters)
- Learn how to use parameters to specify surface texture, surface roughness, surface finish
- Learn the difference between amplitude parameters, spatial parameters, (height and spatial) hybrid parameters, and functional parameters
- Learn which parameters apply for functions such as sealing, appearance, fluid retention, adhesion, optical properties
- Basics of surface finish specification (surface texture/surface roughness specification)
- No prerequisites. This module is part of the Surface Texture and Tribology Short Course, so viewing Module 1 (Introduction, Instruments) and Module 2 (Filtering for Roughness, Waviness & Form) ) is recommended.
Will a gasket seal? Will brakes chatter? Will pits on a surface lead to corrosion or failure?
These types of questions are asked daily in a vast variety of industries. Surface texture (surface finish, surface roughness) is often the key to the answers. Measuring surface texture, and analyzing it accurately, provides vital information as to how a component will perform its intended function—as it leaves the factory and throughout its lifespan.
Many people in industry are familiar with measuring common surface roughness parameters such as Average Roughness (Ra) and RMS Roughness (Rq). Yet these parameters often do not tell the whole story about how a part will function.
This module introduces many common and advanced surface texture parameters, starting with basic amplitude parameters such Ra, and Rq, and moving on into spatial parameters, hybrid parameters and functional parameters. We look at the definition and meaning of each parameter, as well as their strengths and shortcomings for describing how a part will fulfill its function. Most important, we show which parameters are best suited for use in common applications.
Finally, we take a look at how surface texture/surface roughness is specified per the ISO 1302 standard and the ASME Y14.36 standards.
This module is Part 3 of the 10-part Surface Texture and Tribology short course. The full course is available on udemy, or you can select the individual course modules of interest to you. Enter "surface roughness texture tribology" in the udemy search bar to browse the full course and modules.
Who this course is for:
- Scientists, engineers, technicians and students in the fields of automotive, medical device, aerospace, materials, polymers, and others
In 1994, Dr. Cohen established Michigan Metrology to help engineers and scientists solve problems related to “Squeaks, leaks, friction, wear, appearance, adhesion and other issues,” using 3D Surface MicroTexture Measurement and Analysis.
Dr. Cohen is a past Chairman of the STLE-Detroit section and has been active with the ASME B46.1 committee on surface texture since 1988, having served as Chair from 2005-2011. Dr. Cohen is also a Subject Matter Expert for the ISO surface metrology activities.
Dr. Cohen has an undergraduate degree in Physics from the University of Michigan, Dearborn, and graduate degrees in Physics and Optical Sciences from the University of Arizona. Early in his career, Dr. Cohen worked with IBM on optical disk drive development. He later joined WYKO Corporation as Product Manger and later became Vice President, leading the development of 3D surface texture metrology instrumentation.
Dr. Cohen has developed this class over the past 20 years having presented the material at numerous client locations as part of his training and consulting activities. Typically once a year the class is offered to a general audience in the Livonia, MI area.