The KMODDL team at Cornell University maintains an excellent digital library of kinematic models with animations. Access their site at the link:
According to Shigley and Mischke’s Mechanical Engineering Design (McGraw-Hill 1989) experiments show that the tensile stress supported by a threaded rod equals that of a rod with diameter that is the mean of pitch and minor diameters of the threads. Thus, the tensile stress area of a threaded fastener is computed from the average of its pitch and minor diameters.
- Instock Fasteners provides ANSI/ASME screw thread sizes: ScrewThreadTables
- Little machine shop provides downloadable lists for tap and clearance holes: tapdrillsizes.pdf
- Engineers Edge provides a useful table of thread sizes.
- And large listing of fasteners can be found at SmithFast.
This spherical eight-bar linkage was designed by GimSong Soh to guide a car door from the side to the top of the vehicle. This animation shows the versatility of movement provided by these linkages. (UCI Robotics and Automation Lab)