Concentricity : GD&T Basics

Concentricity tolerance controls the central axis of a cylinder or sphere with respect to datum plane/axis. In another words, it controls median points on high precision cylindrical parts such as transmission gears. LMC and MMC modifiers are not applica ...

Parallelism : GD&T Basics

Parallelism controls parallelism between two lines, surfaces or axis. In another words, it describes a parallel orientation of one referenced feature to a datum surface or line in 3d tolerance zone. Parallelism does not controls the angle of the refere ...

Basics of GD&T : SMLease Design

Geometric Dimension & Tolerance (GD&T) is a system for defining engineering tolerances. GD&T is very important part of mechanical product design. GD&T defines degree of accuracy and precision required on controlled feature of part, allowa ...