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Abstract:

This video clip features a speaker discussing their entry for a "smoothest surface finish" prize, aiming to improve upon their previous year's win at the "hero awards 2021." The speaker highlights achieving an exceptionally smooth surface roughness of Ra 0.54 nanometers on hardened steel (52 Rockwell C) using flat polishing techniques with very fine abrasives. They explain that measuring such fine finishes requires advanced methods beyond traditional stylus profilometry, detailing the use of a laser scanning microscope to create a 3D surface map. Software then filters out waviness to calculate roughness parameters like Ra along a line. The achieved 0.54 nm Ra is noted as a personal record for the speaker.

Achieving Ultra-Smooth Surface Finish: Polishing and Measurement

• 0:00 Context: The speaker mentions winning the "hero awards 2021" last year.
• 0:07 Goal: This year, the speaker aims to win the prize for the smoothest surface finish.
• 0:13 Achievement: An extremely smooth surface finish of Ra 0.54 nanometers (equivalent to 0.00054 microns or 0.02 micro inches) has been achieved.
• 0:27 Material: The polished material is steel hardened to 52 Rockwell C.
• 0:36 Standard Process: Flat lapping and polishing are typically used to achieve good surface roughness (around 0.05 microns Ra or better).
• 0:48 Advanced Process: To achieve this ultra-fine surface finish, the speaker employed flat polishing using a very fine abrasive.
• 01:03 Measurement Challenge: Measuring such smooth surfaces is difficult with traditional stylus methods (diamond tip).
• 01:15 Advanced Measurement: A laser scanning microscope located at a center in the Netherlands was used to measure the surface.
• 01:21 Measurement Technique: The microscope creates a 3D map of the surface.
• 01:28 Data Processing: Software filters out surface waviness to isolate and calculate the actual roughness.
• 01:36 Roughness Parameters: The system can calculate area roughness (Sa, Sz) or line roughness (Ra, Rz).
• 01:52 Specific Result: The reported value of 0.54 nanometers is an Ra (line) measurement.
• 01:59 Significance: This level of smoothness represents a personal record for the speaker.