GD&T Tutorial – Assembly Tolerance Chain Stack Up Analysis

Tolerance Stack up analysis is very useful for calculating tolerance in assembly. This GD&T tutorial will explain how to perform worst case method of tolerance stack up. All the machining process produces the components within certain amount of tolerance to its desired dimensions. As the precision of the machining process increases, the tolerance get reduced but no practical machine can produce components with zero tolerance. Due to this tolerance only, the concept of MMS, LMS and bonus tolerance is developed. The situation become even more complicated when multiple components with different tolerance form an assembly. For such an assembly, what will be the tolerance? How to calculate the whole assembly tolerance?