ThomasNet provides a link to a useful white paper on Timing Belt Theory by Gates-Mectrol:
http://www.thomasnet.com/white-papers/abstract/101106/timing-belt-theory.html
Geometric data on timing belt drives can found in the catalog linked to Gates-Mectrol home page:
Gear geometry data is available from PIC Design Inc. which is now part of RBC Bearings at the link:
http://pic-designcatalog.com/Images/pdfcat/section_12.pdf
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Stock Drive Products provides an on-line Handbook of Gears at the website:
http://www.sdp-si.com/products/Gears/Index.php
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The Gleason Gear has a lot of useful information:
The American Gear Manufacturers Association provides standards for sale on-line at the site:
https://www.agma.org/standards/.
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Prof. David Alciatore has a large number of videos illustrating machines, physics principles and billiards, including high speed videos. Video demonstrations of mechanisms can be found at the following site as well as links to much more:
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)
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.
His example of the Sarrus linkage is also found on YouTube:
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
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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)
http://synthetica.eng.uci.edu/Linkages.html
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:
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/
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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.
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)