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Application Of Cadd/Cam To Engineering Technology Courses And Some Real Life Projects

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2007 Annual Conference & Exposition


Honolulu, Hawaii

Publication Date

June 24, 2007

Start Date

June 24, 2007

End Date

June 27, 2007



Conference Session

Manufacturing Capstone and Design Projects

Tagged Division

Engineering Technology

Page Count


Page Numbers

12.245.1 - 12.245.17



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Paper Authors


B. Sridhara Middle Tennessee State University

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Dr. B. S. Sridhara is a professor in the Department of Engineering Technology and Industrial Studies at Middle Tennessee State University. He received his B.S.M.E. and M.S.M.E. degrees from Bangalore University and Indian Institute of Science, Bangalore, India. He received his M.S.M.E. and Ph. D. degrees from Stevens Institute of Technology, Hoboken, New Jersey, and Auburn University, Alabama. Dr. Sridhara has published several peer-reviewed articles in the areas of Acoustics, Vibration, finite element methods, and Engineering Education.

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Rick Taylor Middle Tennessee State University

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Mr. Taylor is the director of the machine tool technology in the Department of Engineering Technology and Industrial Studies at Middle Tennessee State University. He received his B. S. degree in Industrial Studies and M. S. degree in Engineering Technology and Industrial Studies from Middle Tennessee State University. Mr. Taylor teaches basic and advanced machine tool technology classes and helps the undergraduate students with their experimental vehicles project. He is well versed with the operation and maintenance of CNC and rapid prototyping machines.

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NOTE: The first page of text has been automatically extracted and included below in lieu of an abstract

Application of CADD/CAM to Engineering Technology Courses and Some Real Life Projects


Computer-assisted drafting/design (CADD) and computer-assisted machining (CAM) are very powerful tools both in engineering education and industry. At Middle Tennessee State University (MTSU) we have a strong CAD/CAM curriculum. Our Engineering Technology students learn two-dimensional CADD and solid modeling in our three CADD classes using software such as AutoCAD, Inventor and SolidWorks. The two Machine Tool Technology classes help students learn the basics of CNC machining, rapid prototyping and laser engraving while incorporating their CADD abilities. In the advanced class the students design and build an air motor from scratch learning how CADD and CAM are directly linked. They design the parts using CADD and the parts are created using a Fadal vertical machining center (VMC) CNC unit, a CNC lathe, and a StrataSys fused deposition modeling (FDM) rapid prototyping machine that extrudes molten ABS plastic layer by layer to create a 3-dimensional part. The air motor capable of rotating a 14x6 propeller at over 2200 rpm has six cylinders with a rotary configuration (cylinders move radially) while receiving air supply through ports. Power is transmitted from the motor shaft to a propeller through a 6 to 1 (geared up) planetary gear unit. The advantage of the planetary gears is that they are compact and still produce the desired speed ratio. The air motor is used in our Fluid Power class to demonstrate the working of a pneumatic motor. The planetary gear unit is used in Dynamics to illustrate the rotation of a rigid body about a fixed axis and calculation of physical quantities such as angular velocity, acceleration and momentum. Spur or helical gears with the involute tooth profile are used in the planetary unit. The involute is generated in two dimensions using AutoCAD and imported to the Inventor three-dimensional modeling software for generating 3D models. In our Engineering Technology and Industrial Studies (ETIS) department we compete in several national contests such as the moon buggy, mini-Baja, solar bike and solar boat. Size, strength-to-weight ratio and performance are key factor in all these vehicles. A planetary gear unit is used in some of these projects for speed reduction or increasing between the motor shaft and the drive shaft because of its compact size and inherent high torque capabilities. The planetary components on the 6-cylinder rotary engine are ABS plastic and the Moon-buggy’s and the Mini-Baja’s components are machined from aluminum and steel.

Sridhara, B., & Taylor, R. (2007, June), Application Of Cadd/Cam To Engineering Technology Courses And Some Real Life Projects Paper presented at 2007 Annual Conference & Exposition, Honolulu, Hawaii. 10.18260/1-2--2796

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