fish scale pattern on ways
"Ed Huntress" wrote in message news:... snip The basic purpose of a scraper is to refine the surface for flatness or other accuracy, depending on what's being scraped. The scrapers at Moore Special Tool used to scrape the ways and the table surface of their jig grinders to +/- 40 millionths of an inch, from end to end. When they were feeling frisky they worked it down to +/-20 millionths, just for fun. The frosting is a final touch. However, in commercial lathe building today, it's generally done with a power scraper, which contains a solenoid or a motor and crank that stroke the scraper in and out. Manual scraping can be a workout. Misleading wording he Most machine tools have ground ways today. Power scrapers are used for applying the *decorative frosting*, not for scraping for improved accuracy. I don't know if the ways on *any* machines are hand-scraped for accuracy in production today. It is used in rebuilding machine tools, however. -- Ed Huntress |
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