MIT2_007s09_lec08

MIT2_007s09_lec08 - MIT OpenCourseWare http:/ocw.mit.edu...

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MIT OpenCourseWare http://ocw.mit.edu 2.007 Design and Manufacturing I Spring 2009 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .
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2.007 –Design and Manufacturing I Mechanisms: Force Transmission Presented by Dan Frey on 3 MAR 2009 F in F out
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• How many degrees of freedom does this mechanism have? 1) 1 2) 2 3) 3 4) 0 Source: Fig. 4-31 in Suh, C. H. Computer Aided Design of Mechanisms Part A. Self-published book, 1989. Courtesy of Dr. C. H. Suh. Used with permission.
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• How many degrees of freedom does this mechanism have? 1) 1 2) 2 3) 3 4) 0 The answer is one degree of freedom. Six bodies are in the mechanism if we include the block sliding within the window. Sliding motion constrains the block within the window (-2DOF). There are also 7 full pin joints (-2DOF each). Finally, there is traction between the pinion and the sector gear 6*3-2-7*2-1=1. Source: Fig. 4-31 in Suh, C. H. Computer Aided Design of Mechanisms Part A. Self-published book, 1989. Courtesy of Dr. C. H. Suh. Used with permission.
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• How many degrees of freedom does this mechanism have (not including the vehicle, wheels, etc)? 1) 1 2) 2 3) 3 4) 0 Image removed due to copyright restrictions. Please see any photo of a John Deere 320 Skid Steer Loader, such as http://www.deere.com/en_US/cfd/construction/deere_const/media/pdf/skidsteer/DKA300SSLCWP.pdf
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• How many degrees of freedom does this mechanism have (not including the vehicle, wheels, etc)? 1) 1 2) 2 3) 3 4) 0 The answer is two degrees of freedom. Four bodies are in the mechanism if we include the pneumatic pistons. There are 6 full pin joints (-2DOF each) if we include the pivots at both ends of each pneumatic. Finally, each pneumatic can change length adding 1 DOF each.
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This note was uploaded on 02/23/2012 for the course MECHANICAL 2.007 taught by Professor Fry during the Spring '11 term at MIT.

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MIT2_007s09_lec08 - MIT OpenCourseWare http:/ocw.mit.edu...

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