Advantages
• The most commonly used parameter to monitor a production process.
• Default parameter on a drawing if not otherwise specified.
• Available even in the least sophisticated instruments.
• Statistically a very stable, repeatable parameter.
• Good for random type surfaces, such as grinding.
• A good parameter where a process is under control and where the
conditions are always the same, e.g. cutting tips, speeds, feeds, cutting fluid
(lubricant).