possibly by using a planer or shaper - seldom used in machine shops these days, but there was a shaper type tool used in the movie adaptation of the Andromeda Strain. And surface uniformities of .000025 inches (25/1000000 inches) can be produced in metals using essentially a sharpened chisel - a process known as hand scraping. A precision reference and a die is used to expose high spots, which are cyclically removed with the scraper. --- cctech-bounces at classiccmp.org <aw288 at osfn.org> wrote: who figured out the Xbox it's a great read): He gets chips back find out what went than grinding. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com