This assembly of spherical rhombus linkages expands to enclose a volume.  It was designed by Jerome Choe to explore the construction of complex articulated systems. (UCI Robotics and Automation Lab)

## C. J. Sangwin’s linkage movies

Chris Sangwin has a nice collection of linkage movies at How round is your circle?.

Particularly nice are the straight line mechanisms such as Hart’s second straight-line mechanism.

Fred Klingener has generated a number of interesting mechanism animations.  My favorite is the Peaucellier straight line mechanism.  You will find a table of 16 or so animations at his site:

http://www.brockeng.com/mechanism/index.htm

Brock Institute Logo

This link connects to a web-page with a number of linkage animations. There are several planar four-bar linkages, several spherical four-bar linkages, and an example of a spatial four-bar linkage called a Bennett linkage that is shown below. This page also includes a number of spherical linkage animations generated by students some years ago. (UCI Robotics and Automation Lab)

This animation was generated by HaiJun Su using POV-Ray. It is a Bennett linkage designed to guide the coupler linkage through three specified task positions:

## Kinematic models for design

The KMODDL team at Cornell University maintains an excellent digital library of kinematic models with animations.  Access their site at the link:

http://kmoddl.library.cornell.edu/

KMODDL Logo

## Machine screw dimensions

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.

• Little machine shop provides downloadable lists for tap and clearance holes:  tapdrillsizes.pdf
• And large listing of fasteners can be found at SmithFast.

## Spherical eight-bar linkage for a car door

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)

## Diesel Engine Animations

This are two animation of the operation of a diesel engine.  The first focuses on the four stroke cycle. The second start with the turbo-charger, and makes its way through the engine.

## Engine Animation

This YouTube animation shows the animated assembly of a solid model of a four-cylinder engine.  It interesting just to see the number of fasteners, but it is worth waiting for the animation of the four-stroke cycle that occurs about two-thirds through.

## Welcome to Mechanical Design 101

Mechanical Design 101 is a collection of resources to educate, guide and perhaps inspire the mechanical designer.  Please send me links to your favorite resources, and to interesting and useful examples of mechanical devices. I would also appreciate a note, if you see any errors. Thank you, Michael McCarthy