Parallelism is one of the geometric tolerances used to control how parallel a surface or feature is relative to a specified datum surface or datum axis. Proper control of parallelism helps improve assembly accuracy between components, resulting in better machine performance, smoother operation, and higher product reliability. This article provides an easy-to-understand overview of parallelism, … Continue reading WHAT IS PARALLELISM MEASUREMENT? DIFFERNECES BETWEEN PARALLELISM AND FLATNESS