Roughness

in all Drawings their is on impotent Item that in many surface mention on tolerance line is roughness, it emphasize casting, forging and machining area with this you know that witch surface must produce by machining and witch aria must produce by casting, and also with the roughness number you can find what type of machine and tool must use to reach the quality of surface
but how we can measure it, it is one of the important item that many people forget to measure it, and measure roughness is one of the easiest method

first use Reutlingen Machinery Standard book





Second use roughness sample pack
with this pack you can compair the roughness of pack samples and part surface by your nail or pen

third use roughness tester



mehran ghorbani nezami