You can see the draw marks when you hold the part up to the light, but they are so slight that you cannot feel them by running your finger over the metal. The drawing operation leaves draw marks, which are light lines in the drawn surface. The firm is primarily a Tier 2 producer of stamped wheel and engine seal components, serving seal manufacturers that supply the major automobile companies as well as heavy-equipment manufacturers. Tryson Metal Stampings & Manufacturing, Inc., Addison, Illinois, is a case in point. The vendors, in turn, are looking to gage manufacturers for surface measuring tools that are fast, accurate and easy to use. As manufacturing firms become more aware of the importance of surface finish to part performance, they are requiring their vendors to meet specified surface finishes. However, today's customers demand greater part accuracy and consistency, and subjective evaluations of surface finish just aren't good enough anymore. The uncanny ability of experienced hands to accurately "read" surface finish was the stuff of shop legends in the past. But for many shops, surface finish evaluations have consisted of somebody eyeballing the parts and pronouncing them good enough.
roughness) is usually specified on part prints right along with such things as dimensional tolerances. INTRA's traverse unit combines a 1-mm measuring range with 16-nanometer resolution.