UNDERSTANDING SURFACE ROUGHNESS SYMBOLS

Technical drawings with precise measurements and geometric shapes overlap.

Every production process creates irregularities and has an impact on surface texture. These irregularities directly impact the performance and longevity of mechanical components.

In metrology, the finest, or shortest wavelength deviations are referred to as surface roughness. As a part of the design process, symbols are used to communicate the required surface roughness and efficiencies to be made during the production process. Due to the complex nature of manufacturing, more than one symbol and roughness value may be used on the same print. Below are common symbols called out during the design process:

 

The diagram below shows additional requirements which may be specified on a print:

THE ISO FINISHING DIFFERENCE

Following production, some level of surface finishing is typically needed to remove burrs, flash, tooling marks and to meet the required surface roughness value. The more complicated the shape of the surface, the more precise the surface finishing must be.

With more than 30 years in metallurgy, metrology and manufacturing, the team at ISO Finishing is an expert in understanding surface roughness and the finishing processes needed to meet the most exact specifications. Each process is customized, documented and repeatable – for parts in any material or industry. The best way to show you first-hand how our finish will become your finish is to process your sample free of charge. Let us show you what we can do.

LET'S GET IT FINISHED.