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15 Pages

### 4-14-2011

Course: ENG 303, Fall 2011
School: Rutgers
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Word Count: 341

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OF Homework DESIGN ENGINEERING SYSTEMS I April 14, 2011 Threaded Fasteners and Power Screws Functions Fasteners: mechanically joins or affixes two or more objects Figures from http://www.nutsandbolts.com/ Power Screw: convert rotation to linear motion http://www.absoluteastronomy.com/ topics/Jackscrew http://millingmachinesreviewblog.blog.gy/2010/06/ 08/zen-toolworks-cnc-carving-machine-diy-kit-7x7/...

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OF Homework DESIGN ENGINEERING SYSTEMS I April 14, 2011 Threaded Fasteners and Power Screws Functions Fasteners: mechanically joins or affixes two or more objects Figures from http://www.nutsandbolts.com/ Power Screw: convert rotation to linear motion http://www.absoluteastronomy.com/ topics/Jackscrew http://millingmachinesreviewblog.blog.gy/2010/06/ 08/zen-toolworks-cnc-carving-machine-diy-kit-7x7/ DESIGN OF ENGINEERING SYSTEMS I http://knightvision.calvin.edu/bbcswebda v/orgs/ENGR/senior-projects/200708/Team03/Album/index.htm April 14, 2011 Standard Thread Forms Key parameters and terminology Major, Minor, and Pitch Diameters Pitch diameter is the diameter of a theoretical cylinder that passes through the threads in such a way that the distance between the thread crests and thread roots is equal. In an ideal product, these widths would each equal one-half of the thread pitch Thread Pitch Included Angle http://www.fastenal.com/web/services.ex?action= FEDS&article=ScrewThreadDesign DESIGN OF ENGINEERING SYSTEMS I April 14, 2011 Standard Thread Forms The thread is define as 1 -20 4 UNC -2 A (tolerance level, external/internal) DESIGN OF ENGINEERING SYSTEMS I April 14, 2011 Standard Thread Forms The thread is as 6 define 0.75 DESIGN OF ENGINEERING SYSTEMS I April 14, 2011 Tensile Stress Area A measure approximating the smallest possible fracture area 2 ( + ) = 4 2 = http://www.tribology-abc.com/calculators/e3_6d.htm http://www.bestbolt.com/white_papers/white_paper_06.pdf DESIGN OF ENGINEERING SYSTEMS I April 14, 2011 Power Screw Lead screws or translation screw large mechanical advantages for lifting and moving large loads Accuracy DESIGN OF ENGINEERING SYSTEMS I April 14, 2011 Applications DESIGN OF ENGINEERING SYSTEMS I April 14, 2011 Force and Torque Analysis Chapter 10.3 DESIGN OF ENGINEERING SYSTEMS I April 14, 2011 Example Determine the lifting and lowering torque and the efficiency of power screw using ACME screw and nut. The axial load 10000 lbs. The mean collar diameter is 2 in. The coefficients of friction are estimated as 0.13 and 0.10 for f and fc . DESIGN OF ENGINEERING SYSTEMS I April 14, 2011 Example DESIGN OF ENGINEERING SYSTEMS I April 14, 2011 Example DESIGN OF ENGINEERING SYSTEMS I April 14, 2011 Example DESIGN OF ENGINEERING SYSTEMS I April 14, 2011 Power Screw and CNC DESIGN OF ENGINEERING SYSTEMS I April 14, 2011 Power Screw and CNC DESIGN OF ENGINEERING SYSTEMS I April 14, 2011
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