Archive | April, 2009

Gear geometry

Gear geometry data is available from PIC Design Inc. which is now part of RBC Bearings at the link:

http://www.pic-design.com/static/PDF/Catalog%2045.0.pdf

RBC Bearings Logo

RBC Bearings Logo

Stock Drive Products provides an on-line Handbook of Gears at the website:

http://www.sdp-si.com/D190/D190cat.htm

Stock Drive Products Logo

Stock Drive Products Logo

The Gleason Gear Encyclopedia is available for sale at the site:

http://www.quikey-c.com/gleason/SKUDetailsGLEAFGL6000.Asp

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The American Gear Manufacturers Association provides standards for sale on-line at the site:

http://www.agma.org/Content/NavigationMenu/Publications/TechnicalPublicationsStandards/AGMAStandardsInformationSheets/default.

AGMA Logo

AGMA Logo

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Linkage animations on synthetica

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/~mccarthy/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:
YouTube Preview Image

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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.

  • Here is a link to Instock Fasteners which provides ANSI/ASME screw thread sizes:

http://www.instockfasteners.com/Tools/ScrewThreadTables.ASP

  • Marine Fasteners lists the thread sizes and provides sizes for tap and clearance holes:

http://www.marfas.com/machinescrewtapping.shtml

This site also shows the various types of machine screw heads.

  • Engineers Edge provides a table of thread sizes at:

http://www.engineersedge.com/screw_threads_chart.htm

  • And head dimensions can be found at SmithFast:

http://www.smithfast.com/msflathead.html

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