In relation to the Modern development of high-speed machines, higher loadings & increased speeds of moving parts has resulted. In order to withstand these more severe operating conditions with minimum friction & wear, having a particular surface finish may be essential or even required. Therefore, it may be necessary for the designer to accurately describe the required finish to those who are actually making the parts. Machines are rarely designed & manufactured in the same plant & are often designed in one location, manufactured in another, & possibly then finally assembled in a third.