Two-dimensional and three-dimensional type maps are constructed for both planar four-bar and simply RSSR linkage. For a two-dimensional type map, both abscissa and ordinate of the map are two unknown parameters of the linkage. A map is then composed of several regions that represent different types. Depending on whether the input or output link can make fully rotation, the types can be drag link, crank-rocker, rocker-crank, double-rocker, or unassembled. The axes of three-dimensional type maps are three link lengths left to be designed. These type maps become very helpful in designing a linkage after combining with related curves or surfaces. The three-dimensional type maps can even be viewed at different sections to facilitate the design process. The Grashof's rule is the theoretical basis in constructing the type maps for planar four-bar. As for the simply RSSR linkage, the strategy and flowchart developed in related works are adopted and followed. Both numerical analysis and 3D design software, e.g. MATLAB and PRO/E, have to be integrated and used to construct the type maps.
