Sources for engineering data on parts and materials.

DMG-LIB Library

DMG-LIB.org mechanism library

The Digital Mechanism and Gear Library has a terrific collection of mechanism models, animations and books as well as links to other collections around the world. Select this link DMB-LIB.org.

The Mechanism Description page has a long list of items, every one of which opens to a large number of interesting mechanism systems:

DMG-LIB mechanisms

DMG-LIB mechanisms

Design Exchange

Design Exchange and HCD Connect

Interesting examples of web-sites designed to share information about project engineering methods and practice can be found at the two following sites:

Design Exchange

Design Exchange

1. The Design Exchange site managed by Celeste Roschuni of the Berkeley Expert Systems Technologies Laboratory under the direction of Prof. Alice Agogino.

HCDconnect

IDEO’s HCDconnect

2. The company IDEO, whose principal Dave Kelly is associated with Stanford’s d.School, has established a non-profit effort funded by Bill and Melinda Gates called IDEO.org which has built HCDConnect.

Oberlin Sphere

Instruments for Natural Philosophy

This site has photographs of a large number of devices used to teach physics. It is fascinating.
Select the link: http://physics.kenyon.edu/EarlyApparatus/index.html

Stock Drive Products Logo

Technical information for mechanical components

Stock Drive Products Logo

Stock Drive Products Logo

Stock Drive Products has an array of downloadable catalogs with technical information for a range of mechanical components.  See the link: Stock Drive Products Catalogs

Parallel Mechanisms information center

Parallel Mechanisms information center

Ilian Bonev maintains bibliography and patent databases on parallel mechanisms and much more at ParallelMIC. Access it at the link http://www.parallemic.org/

Parallel Mechanisms information center

Parallel Mechanisms information center

MatWeb:  Material Property Data

Mechanical Properties of Steel

The MatWeb site provides detailed information about materials such as the tensile strength of various compositions of steel.

MatWeb:  Material Property Data

MatWeb: Material Property Data

For example the search “low carbon steel” results in the list of links to information:
http://www.matweb.com/search/QuickText.aspx?SearchText=low%20carbon%20steel

Total Materia

Unified Numbering System for Materials

There are a variety of numbering systems for materials such as steel. The unified numbering system (UNS) uses a letter to designate a material category followed by five numbers constructed from the existing materials designations to coordinate all of these numbering systems.

The unified numbering system (UNS) is described in Wikipedia at the link: Unified numbering system

Some of the category letters for steel are:
– G for AISI/SAE carbon and alloy steels;
– S for stainless steels; and
– T for tool steels.

Generally, the standard designation is inserted after the letter defining the material category. For example, AISI/SAE 1018 carbon steel has the UNS designation G10180.

The AISI-SAE steel alloy designation system is listed in Total Materia.
Also see Wikipedia at the link:  SAE steel grades

Elastic Modulus v. Density

Material Properties Charts

Cambridge University provides a useful overview of materials properties such as the chart below.

Elastic Modulus v. Density

Elastic Modulus v. Density

The tutorial can be accessed at the link:
http://www-g.eng.cam.ac.uk/125/now/mfs/tutorial/non_IE/charts.html

Periodic Table

NIST Periodic Table

Periodic Table

Periodic Table

The National Institute of Standards and Technology provides an on-line periodic table. Access it and other information at the link:  Periodic Table

National Institute of Standards and Technology

National Institute of Standards and Technology

Materials Selection in Mechanical Design

Materials Selection in Mechanical Design

Michael Ashby presents materials information in a practical format in his book Materials Selection in Mechanical Design.

Materials Selection in Mechanical Design

Materials Selection in Mechanical Design

This is a link to lecture notes that give an idea of his approach:
http://www.uofaweb.ualberta.ca/cme/pdfs/443ashbylectures2006.pdf