An Optical System for the Measurement of Scraped Surface
Date Issued
2009
Date
2009
Author(s)
Chou, Jui-Cheng
Abstract
Scraping process is a very traditional hand work to produce lubrication grooves on a sliding surface. The scraped surface must have equally distributed patterns with required amount and concave profile per unit area, and in the meantime remaining good flatness. Although the quality of flatness can be measured by gauges, the unevenroove profiles have never been precisely measured by instrument. In this study, a measurement system based on a commercially available pick-up head is developed to measure the groove profile. This measurement system consists of a laser probe module and an XY stage. The laser probe is composed of a DVD pickup head and an image set. Driven by the XY stage in zigzag steps, the whole scraped profile can be rapidly scanned. The quality of the scraped surface can thus be improved in a more scientific way. Based on the concept of the scraping surface, we also produce regularrray pattern to replace the hand-made lubrication grooves on a sliding surface by CNC machine. Comparing the friction force variation of both patterns, it is found that the CNC generated regular pattern performs more steady friction through the whole stroke than the traditional hand scraped surface.
Subjects
scraping surface
DVD pickup head
focus error signal
friction force
Type
thesis