DOCSLIB.ORG

CD-ROM Advanced Mechanism Connections

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
CD-ROM Advanced Mechanism Connections Mechanism Tutorial 5: CD-ROM Advanced Mechanism Connections Objective: Use Mechanism Design to create kinematic gear pair connections. You create gear pairs by selecting joint axes, and the gear pair connections constrain the relative velocity of the joint axes. Because of this, the physical geometry of the gears has no impact on the kinematics. In the example below, a motor turns several gears, driving the position of the laser housing in a CD-ROM drive. 1. Download the CD-ROM parts from website 2. Open File cd_case.asm Assemble the lift part that is used to raise and lower the laser housing when a disc is inserted. First create a Slider connection. Slider connection sis used to maintain the orientation of the part throughout the motion. The gray component is the slot for the slot/follower connection, and as it moves back and forth it raises and lowers the component you are about to assemble Part Lift Bracket Assembly 1. Select the lift_bracket.prt part in your model tree > RMB on the part > Select Hide Model. This will cleanup are workspace and hide unneeded parts for now. 2. Click on the Assemble Icon > Select lift.prt > Constraints a. Choose Slider Connection i. Assembly: Select slider_axis ii. Component: Select slider_axis b. Rotation i. Assembly: Slider_Ref ii. Part: Slider_Ref iii. RMB Flip Constraint Slider: Select Axis lines Rotation: Select Slider_Ref from both parts c. Using the 3D Dragger (Tracker Ball) to move the part into the slots shown. Do not worry about making it perfect. We just want to create a starting point Place approximately in the slots d. Green Check to Accept the connection. (NOTE we will be editing this connection after hiding some features from the Model Tree) e. Hide the Following in the Model Tree i. Case.prt ii. Lift_Motor.asm f. Unhide the following in the Model Tree i. Lift_Bracket.prt g. RMB on Lift.prt > Edit Definition > Select Placement Tab > Select New > Select Slot Connection > Select the following NOTE: SET THE MODEL TO HIIDDEN LINES FOR BETTER VISUAL i. Assembly: HOLD CTRL KEY > Select the following three lines from the slot that represent the path for the slot sweep ii. Part: Select PNT 0 as shown below Datum PNT 0 Slot Path (Hold CTRL Key to select all 3 lines) h. Select Green Check to accept Connection i. Change View Display to Shading j. Unhide the Following from the Model Tree i. Case.prt ii. Lift_Motor.asm k. Use the Hand Grab to select the Bracket and drag to it to show the movement Notice the bracket is constrained to the area within the Slot. Part Assembly: Gear Connections 1 Assemble the following objects. See example for placement of parts 1. Tray_Gear.prt: Use a Pin Connection with the center axis of the left post from the case_2.prt (Main Body). Pin Connection w/post from case.prt Lift_Gear.prt Tray_Gear.prt 2. Lift_Gear.prt: Use a Pin Connection with the center axis of the left post from the case_2.prt (Main Body). Try to line gears up as best as possible with the Lift_Bracket.prt 3. Pulley_2.prt: Assemble to appropriate hole using the Pin Connection to the center axis of the post provided from case_2.prt (Main Body) NOTE: Be sure to have the motion pointing up. May have to flip the direction of motion. Pulley_2.prt: Pin Connection with post. Gear Teeth face down to Case_2.prt 4. Belt.prt: Assemble using standard Coincident constraints to the Lift_Motor.asm to the Pulley_2.prt. When placing the height of the belt approximate the distance to fit the belt between the Lift_Motor.asm to the Pulley_2.prt. 5. Hide the Lift_Bracket.prt and the Lift.prt from the Model Tree > Select Applications Tab > Mechanism Icon > Choose to access the Gear Pair Definition dialog > Change name to Pulley_Gear 6. Select the following connection from the small side of the pulley (selection should be the Pin/axis of the pin connector shown. The system selects the Gear and Carrier bodies, and displays a purple arrow indicating the direction of rotation(place your right thumb in the direction of the arrow, and your fingers curl in the direction of rotation) a. Enter 4 for pitch circle diameter Pitch Circle Diameter 4 Select this Pin Connection 7. Choose Gear 2 Tab > Choose the motion axis as shown (Part Pulley_2.prt axis line) > Flip the direction , so the direction of motion is the same as Gear 1 > Circle Pitch Diameter 14 > Click Apply Flip Direction Pitch Circle Diameter 14 Select Pin Connection from Pulley_2.prt Note: The system displays a gear icon for each component, as well as a dashed line indicating the connection between them. You can change the location of the icon to make it more easily associated with the components. 8. Choose in the Icon Location area of the dialog > Select approximately in the location shown below > Click Apply 9. Choose Gear 1 Tab > Choose in the Icon Location area of the dialog > Select approximately in the location shown below > Click Apply > Click Ok 10. Use the drag components icon to drag the gears. The gears move as expected. Note that as the larger pulley turns, the teeth on the bottom interfere with the teeth of the adjacent gears. The system does not measure or use interference to drive the gears, they are only driven by the relative velocity of the gear pairs, which has not yet been established for the other gears in the system. Part Assembly: Gear Connections 2: Pulley to Largest Gear 1. Select > Name: Large Gear >Select the Motion Axis as shown > Circle Pitch Diameter 7 2. Select Gear 2 Tab > Select the Motion Axis as shown > Circle Pitch Diameter 25 NOTE: Make sure the purple arrow is pointed in the same direction as Gear 1 selection (may have to flip direction) > Select OK Part Assembly: Gear Connections 3: Pair Gear 1. Select > Name: Pinion Gear >Select the Motion Axis as shown > Circle Pitch Diameter 7 2. Select Gear 2 Tab > Select the Motion Axis as shown > Circle Pitch Diameter 22 NOTE: Make sure the purple arrow is pointed in the same direction as Gear 1 selection (may have to flip direction) > Select OK Drag the components to see what happens. Notice how all the gears are moving together. Part Assembly: Gear Connections 4: Rack and Pinion Gear 1. Unhide Lift_Bracket.asm and Lift.prt 2. Select > Name: Rack and Pinion Gear > Change Type to Rack & Pinion > Select the Motion Axis as shown > Circle Pitch Diameter 11 3. Choose in the Icon Location area of the dialog > Select the point approximately as shown below 4. Choose the Rack Tab > Select Slider Motion Axis Shown Below > Select Ok Drag the components to see what happens. Show Mr Jourden Upon Completion .
Load more

Recommended publications
  • 1700 Animated Linkages
    Nguyen Duc Thang 1700 ANIMATED MECHANICAL MECHANISMS With Images, Brief explanations and Youtube links. Part 1 Transmission of continuous rotation Renewed on 31 December 2014 1 This document is divided into 3 parts. Part 1: Transmission of continuous rotation Part 2: Other kinds of motion transmission Part 3: Mechanisms of specific purposes Autodesk Inventor is used to create all videos in this document. They are available on Youtube channel “thang010146”. To bring as many as possible existing mechanical mechanisms into this document is author’s desire. However it is obstructed by author’s ability and Inventor’s capacity. Therefore from this document may be absent such mechanisms that are of complicated structure or include flexible and fluid links. This document is periodically renewed because the video building is continuous as long as possible. The renewed time is shown on the first page. This document may be helpful for people, who - have to deal with mechanical mechanisms everyday - see mechanical mechanisms as a hobby Any criticism or suggestion is highly appreciated with the author’s hope to make this document more useful. Author’s information: Name: Nguyen Duc Thang Birth year: 1946 Birth place: Hue city, Vietnam Residence place: Hanoi, Vietnam Education: - Mechanical engineer, 1969, Hanoi University of Technology, Vietnam - Doctor of Engineering, 1984, Kosice University of Technology, Slovakia Job history: - Designer of small mechanical engineering enterprises in Hanoi. - Retirement in 2002. Contact Email: [email protected] 2 Table of Contents 1. Continuous rotation transmission .................................................................................4 1.1. Couplings ....................................................................................................................4 1.2. Clutches ....................................................................................................................13 1.2.1. Two way clutches...............................................................................................13 1.2.1.
    [Show full text]
  • Integrated Circuit Design Macmillan New Electronics Series Series Editor: Paul A
    Integrated Circuit Design Macmillan New Electronics Series Series Editor: Paul A. Lynn Paul A. Lynn, Radar Systems A. F. Murray and H. M. Reekie, Integrated Circuit Design Integrated Circuit Design Alan F. Murray and H. Martin Reekie Department of' Electrical Engineering Edinhurgh Unit·ersity Macmillan New Electronics Introductions to Advanced Topics M MACMILLAN EDUCATION ©Alan F. Murray and H. Martin Reekie 1987 All rights reserved. No reproduction, copy or transmission of this publication may be made without written permission. No paragraph of this publication may be reproduced, copied or transmitted save with written permission or in accordance with the provisions of the Copyright Act 1956 (as amended), or under the terms of any licence permitting limited copying issued by the Copyright Licensing Agency, 7 Ridgmount Street, London WC1E 7AE. Any person who does any unauthorised act in relation to this publication may be liable to criminal prosecution and civil claims for damages. First published 1987 Published by MACMILLAN EDUCATION LTD Houndmills, Basingstoke, Hampshire RG21 2XS and London Companies and representatives throughout the world British Library Cataloguing in Publication Data Murray, A. F. Integrated circuit design.-(Macmillan new electronics series). 1. Integrated circuits-Design and construction I. Title II. Reekie, H. M. 621.381'73 TK7874 ISBN 978-0-333-43799-5 ISBN 978-1-349-18758-4 (eBook) DOI 10.1007/978-1-349-18758-4 To Glynis and Christa Contents Series Editor's Foreword xi Preface xii Section I 1 General Introduction
    [Show full text]
  • Four-Bar Linkage Synthesis for a Combination of Motion and Path-Point Generation
    FOUR-BAR LINKAGE SYNTHESIS FOR A COMBINATION OF MOTION AND PATH-POINT GENERATION Thesis Submitted to The School of Engineering of the UNIVERSITY OF DAYTON In Partial Fulfillment of the Requirements for The Degree of Master of Science in Mechanical Engineering By Yuxuan Tong UNIVERSITY OF DAYTON Dayton, Ohio May, 2013 FOUR-BAR LINKAGE SYNTHESIS FOR A COMBINATION OF MOTION AND PATH-POINT GENERATION Name: Tong, Yuxuan APPROVED BY: Andrew P. Murray, Ph.D. David Myszka, Ph.D. Advisor Committee Chairman Committee Member Professor, Dept. of Mechanical and Associate Professor, Dept. of Aerospace Engineering Mechanical and Aerospace Engineering A. Reza Kashani, Ph.D. Committee Member Professor, Dept. of Mechanical and Aerospace Engineering John Weber, Ph.D. Tony E. Saliba, Ph.D. Associate Dean Dean, School of Engineering School of Engineering & Wilke Distinguished Professor ii c Copyright by Yuxuan Tong All rights reserved 2013 ABSTRACT FOUR-BAR LINKAGE SYNTHESIS FOR A COMBINATION OF MOTION AND PATH-POINT GENERATION Name: Tong, Yuxuan University of Dayton Advisor: Dr. Andrew P. Murray This thesis develops techniques that address the design of planar four-bar linkages for tasks common to pick-and-place devices, used in assembly and manufacturing operations. The analysis approaches relate to two common kinematic synthesis tasks, motion generation and path-point gen- eration. Motion generation is a task that guides a rigid body through prescribed task positions which include position and orientation. Path-point generation is a task that requires guiding a reference point on a rigid body to move along a prescribed trajectory. Pick-and-place tasks often require the exact position and orientation of an object (motion generation) at the end points of the task.
    [Show full text]
  • Glossary Definitions
    TC 9-524 GLOSSARY ACRONYMS AND ABBREVIATIONS TC - Training Circular sd - small diameter TM - Technical Manual Id - large diameter AR - Army Regulation ID - inside diameter DA - Department of the Army TOS- Intentional Organization for Standardization RPM - revolutions per minute LH - left hand SAE - Society of Automotive Engineers NC - National Coarse SFPM - surface feet per minute NF - National Fine tpf -taper per foot OD - outside diameter tpi taper per inch RH - right hand UNC - Unified National Coarse CS - cutting speed UNF - Unified National Fine AA - aluminum alloys SF -standard form IPM - feed rate in inches per minute Med - medical FPM - feet per minute of workpiece WRPM - revolutions per minute of workpiece pd - pitch diameter FF - fraction of finish tan L - tangent angle formula WW - width of wheel It - length of taper TT - table travel in feet per minute DEFINITIONS abrasive - natural - (sandstone, emery, corundum. accurate - Conforms to a standard or tolerance. diamonds) or artificial (silicon carbide, aluminum oxide) material used for making grinding wheels, Acme thread - A screw thread having a 29 degree sandpaper, abrasive cloth, and lapping compounds. included angle. Used largely for feed and adjusting screws on machine tools. abrasive wheels - Wheels of a hard abrasive, such as Carborundum used for grinding. acute angle - An angle that is less than 90 degrees. Glossary - 1 TC 9-524 adapter - A tool holding device for fitting together automatic stop - A device which may be attached to various types or sizes of cutting tools to make them any of several parts of a machine tool to stop the interchangeable on different machines.
    [Show full text]
  • A New Method for Teaching the Fourbar Linkage and Its Application to Other Linkages
    Paper ID #24648 A New Method for Teaching The Fourbar Linkage and its Application to Other Linkages Dr. Eric Constans, Rose-Hulman Institute of Technology Eric Constans is a Professor in Mechanical Engineering at the Rose-Hulman Institute of Technology. His research interests include engineering education, mechanical design and acoustics and vibration. Mr. Karl Dyer, Rowan University Dr. Shraddha Sangelkar, Rose-Hulman Institute of Technology Shraddha Sangelkar is an Assistant Professor in Mechanical Engineering at Rose-Hulman Institute of Technology. She received her M.S. (2010) and Ph.D. (2013) in Mechanical Engineering from Texas A&M University. She completed the B. Tech (2008) in Mechanical Engineering from Veermata Jijabai Technological Institute (V.J.T.I.), Mumbai, India. She taught for 5 years at Penn State Behrend prior to joining Rose-Hulman. c American Society for Engineering Education, 2019 A New Method for Teaching the Fourbar Linkage to Engineering Students Abstract The fourbar linkage is one of the first mechanisms that a student encounters in a machine kinematics or mechanism design course and teaching the position analysis of the fourbar has always presented a challenge to instructors. Position analysis of the fourbar linkage has a long history, dating from the 1800s to the present day. Here position analysis is taken to mean 1) finding the two remaining unknown angles on the linkage with an input angle given and 2) finding the path of a point on the linkage once all angles are known. The efficiency of position analysis has taken on increasing importance in recent years with the widespread use of path optimization software for robotic and mechanism design applications.
    [Show full text]
  • Theory of Machines
    Theory of Machines Dr. Anwar Abu-Zarifa . Islamic University of Gaza . Department of Mechanical Engineering . © 2012 1 Syllabus and Course Outline Faculty of Engineering Department of Mechanical Engineering EMEC 3302, Theory of Machines Instructor: Dr. Anwar Abu-Zarifa Office: IT Building, Room: I413 Tel: 2821 eMail: [email protected] Website: http://site.iugaza.edu.ps/abuzarifa Office Hrs: see my website SAT 09:30 – 11:00 Q412 MON 09:30 – 11:00 Q412 Dr. Anwar Abu-Zarifa . Islamic University of Gaza . Department of Mechanical Engineering . © 2012 2 Text Book: R. L. Norton, Design of Machinery “An Introduction to the Synthesis and Analysis of Mechanisms and Machines”, McGraw Hill Higher Education; 3rd edition Reference Books: . John J. Uicker, Gordon R. Pennock, Joseph E. Shigley, Theory of Machines and Mechanisms . R.S. Khurmi, J.K. Gupta,Theory of Machines . Thomas Bevan, The Theory of Machines . The Theory of Machines by Robert Ferrier McKay . Engineering Drawing And Design, Jensen ect., McGraw-Hill Science, 7th Edition, 2007 . Mechanical Design of Machine Elements and Machines, Collins ect., Wiley, 2 Edition, 2009 Dr. Anwar Abu-Zarifa . Islamic University of Gaza . Department of Mechanical Engineering . © 2012 3 Grading: Attendance 5% Design Project 25% Midterm 30% Final exam 40% Course Description: The course provides students with instruction in the fundamentals of theory of machines. The Theory of Machines and Mechanisms provides the foundation for the study of displacements, velocities, accelerations, and static and dynamic forces required for the proper design of mechanical linkages, cams, and geared systems. Dr. Anwar Abu-Zarifa . Islamic University of Gaza . Department of Mechanical Engineering .
    [Show full text]
  • 1.0 Simple Mechanism 1.1 Link ,Kinematic Chain
    SYLLABUS 1.0 Simple mechanism 1.1 Link ,kinematic chain, mechanism, machine 1.2 Inversion, four bar link mechanism and its inversion 1.3 Lower pair and higher pair 1.4 Cam and followers 2.0 Friction 2.1 Friction between nut and screw for square thread, screw jack 2.2 Bearing and its classification, Description of roller, needle roller& ball bearings. 2.3 Torque transmission in flat pivot& conical pivot bearings. 2.4 Flat collar bearing of single and multiple types. 2.5 Torque transmission for single and multiple clutches 2.6 Working of simple frictional brakes.2.7 Working of Absorption type of dynamometer 3.0 Power Transmission 3.1 Concept of power transmission 3.2 Type of drives, belt, gear and chain drive. 3.3 Computation of velocity ratio, length of belts (open and cross)with and without slip. 3.4 Ratio of belt tensions, centrifugal tension and initial tension. 3.5 Power transmitted by the belt. 3.6 Determine belt thickness and width for given permissible stress for open and crossed belt considering centrifugal tension. 3.7 V-belts and V-belts pulleys. 3.8 Concept of crowning of pulleys. 3.9 Gear drives and its terminology. 3.10 Gear trains, working principle of simple, compound, reverted and epicyclic gear trains. 4.0 Governors and Flywheel 4.1 Function of governor 4.2 Classification of governor 4.3 Working of Watt, Porter, Proel and Hartnell governors. 4.4 Conceptual explanation of sensitivity, stability and isochronisms. 4.5 Function of flywheel. 4.6 Comparison between flywheel &governor.
    [Show full text]
  • Mechatronic Mechanism Design and Implementation Process Applied in Se- Nior Mechanical Engineering Capstone Design
    Paper ID #26215 Mechatronic Mechanism Design and Implementation Process Applied in Se- nior Mechanical Engineering Capstone Design Dr. Edward H. Currie, Hofstra University Edward H. Currie holds a BSEE, Masters and Ph.D. in Physics from the University of Miami and is an Associate Professor in the Fred DeMatteis School of Engineering and Applied Science where and teaches Electrical Engineering and Computer Science and serves as a Co-Director of Hofstra’s Center for Innovation. Research interests include Additive manufacturing plastic and magnetic technology, robotic systems, color night-vision, autonomous wound closure systems, microchannel plate applications, thermal imaging, programmable systems on a chip (PSoC) and spatial laser measurement systems. His current research is focused on the development of autonomous wound closure systems based on recent advances in magnetic technology. Dr. Kevin C. Craig, Hofstra University Kevin Craig attended the United States Military Academy at West Point, NY, earned varsity letters in football and baseball, and graduated with a B.S. degree and a commission as an officer in the U.S. Army. After honing his leadership and administrative skills serving in the military, he attended Columbia Uni- versity and received the M.S., M.Phil., and Ph.D. degrees. While in graduate school, he worked in the mechanical-nuclear design department of Ebasco Services, Inc., a major engineering firm in NYC, and taught and received tenure at both the U.S. Merchant Marine Academy and Hofstra University. While at Hofstra, he worked as a research engineer at the U.S. Army Armament Research, Development, and Engineering Center (ARDEC) Automation and Robotics Laboratory.
    [Show full text]
  • Using the Singularity Trace to Understand Linkage Motion Characteristics
    USING THE SINGULARITY TRACE TO UNDERSTAND LINKAGE MOTION CHARACTERISTICS Thesis Submitted to The School of Engineering of the UNIVERSITY OF DAYTON In Partial Fulfillment of the Requirements for The Degree of Master of Science in Mechanical Engineering By Lin Li UNIVERSITY OF DAYTON Dayton, Ohio May, 2013 USING THE SINGULARITY TRACE TO UNDERSTAND LINKAGE MOTION CHARACTERISTICS Name: Li, Lin APPROVED BY: Andrew Murray, Ph.D. David Myszka, Ph.D. Advisor Committee Chairman Committee Member Professor, Mechanical and Aerospace Associate Professor, Mechanical and Engineering Department Aerospace Engineering Department Ahmad Kashani, Ph.D. Committee Member Professor, Mechanical and Aerospace Engineering Department John Weber, Ph.D. Tony E. Saliba, Ph.D. Associate Dean Dean, School of Engineering School of Engineering & Wilke Distinguished Professor ii c Copyright by Lin Li All rights reserved 2013 ABSTRACT USING THE SINGULARITY TRACE TO UNDERSTAND LINKAGE MOTION CHARACTERISTICS Name: Li, Lin University of Dayton Advisor: Dr. Andrew Murray This thesis provides examples of a new method used to analyze the motion characteristics of single-degree-of-freedom, closed-loop linkages with a designated input angle and one or two design parameters. The method involves the construction of a singularity trace, which is a plot that reveals changes in the number of geometric inversions, singularities, and changes in the number of branches as a design parameter is varied. This thesis applies the method to planar linkages such as the Watt II, Stephenson III and double butterfly, and spatial linkages such as spherical four-bar and Revolute- Cylindrical-Cylindrical-Cylindrical (RCCC) linkages. Results from this investigation include the following. Special instances of the singularity trace for the Watt II linkage include multiple coincident projections of the singularity curve and symmet- ric characteristics of the singularity trace for special design parameters.
    [Show full text]
  • Online Mechanism Design for Electric Vehicle Charging
    Online Mechanism Design for Electric Vehicle Charging The Harvard community has made this article openly available. Please share how this access benefits you. Your story matters Citation Gerding, Enrico H., Valentin Robu, Sebastian Stein, David C. Parkes, Alex Rogers, and Nicholas R. Jennings. 2011. Online mechanism design for electric vehicle charging. In Proceedings of the 10th International Conference on Autonomous Agents and Multiagent Systems (AAMAS 2011): May, 2-6, 2011, Taipei, Taiwan, ed. Kagan Tumer, Pinar Yolum, Liz Sonenberg, and Peter Stone, 811-818. Richland, South Carolina: International Foundation for Autonomous Agents and Multiagent Systems. Published Version http://www.ifaamas.org/Proceedings/aamas2011/papers/ B6_B70.pdf Citable link http://nrs.harvard.edu/urn-3:HUL.InstRepos:9962006 Terms of Use This article was downloaded from Harvard University’s DASH repository, and is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http:// nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of- use#OAP Online Mechanism Design for Electric Vehicle Charging Enrico H. Gerding∗ Valentin Robu ∗ Sebastian Stein∗ [email protected] [email protected] [email protected] David C. Parkes† Alex Rogers∗ Nicholas R. Jennings∗ [email protected] [email protected] [email protected] ∗University of Southampton, SO17 1BJ, Southampton, UK †Harvard University, Cambridge, MA 02138, USA ABSTRACT are significant concerns within the electricity distribution industries Plug-in hybrid electric vehicles are expected to place a consid- regarding the widespread use of such vehicles, since the high charg- erable strain on local electricity distribution networks, requiring ing rates that these vehicles require (up to three times the maximum charging to be coordinated in order to accommodate capacity con- current demand of a typical home) could overload local electricity straints.
    [Show full text]
  • Kinematics of Machinery (R18a0307)
    KINEMATICS OF MACHINERY (R18A0307) 2ND YEAR B. TECH I - SEM, MECHANICAL ENGINEERING DEPARTMENT OF MECHANICAL ENGINEERING UNIT – I (SYLLABUS) Mechanisms • Kinematic Links and Kinematic Pairs • Classification of Link and Pairs • Constrained Motion and Classification Machines • Mechanism and Machines • Inversion of Mechanism • Inversions of Quadric Cycle • Inversion of Single Slider Crank Chains • Inversion of Double Slider Crank Chains DEPARTMENT OF MECHANICAL ENGINEERING UNIT – II (SYLLABUS) Straight Line Motion Mechanisms • Exact Straight Line Mechanism • Approximate Straight Line Mechanism • Pantograph Steering Mechanisms • Davi’s Steering Gear Mechanism • Ackerman’s Steering Gear Mechanism • Correct Steering Conditions Hooke’s Joint • Single Hooke Joint • Double Hooke Joint • Ratio of Shaft Velocities DEPARTMENT OF MECHANICAL ENGINEERING UNIT – III (SYLLABUS) Kinematics • Motion of link in machine • Velocity and acceleration diagrams • Graphical method • Relative velocity method four bar chain Plane motion of body • Instantaneous centre of rotation • Three centers in line theorem • Graphical determination of instantaneous center DEPARTMENT OF MECHANICAL ENGINEERING UNIT – IV (SYLLABUS) Cams • Cams Terminology • Uniform velocity Simple harmonic motion • Uniform acceleration • Maximum velocity during outward and return strokes • Maximum acceleration during outward and return strokes Analysis of motion of followers • Roller follower circular cam with straight • concave and convex flanks DEPARTMENT OF MECHANICAL ENGINEERING UNIT – V (SYLLABUS)
    [Show full text]
  • Simply Marvelous Machines
    Simply Marvellous Machines Have you ever stopped to think about how many simple machines we use in our everyday lives? Did you climb a flight of stairs this morning? Did you use something to prop a door open? Did you open a window blind? Turn on a light switch? Cut something with a pair of scissors? All of these everyday activities use simple machines. Sometimes these simple machines have been put together to form a more complex machine, like scissors which are comprised of two levers and two wedges, but beneath all those parts there are simple machines working to make our life easier. Background Information So what is a simple machine anyway? Simply put, simple machines are mechanical devices that make work easier by changing the magnitude, the direction or the distance and speed of a force. Our ancestors used simple machines to make their life easier, to solve everyday problems they encountered and to build incredible things, such as Stonehenge. Simple machines can be organized into two families: levers or inclined planes. The Six Types of Simple Machines Simple machines are often classified into six types. The lever family includes the lever, the wheel and axle (gear) and the pulley. The inclined plane family includes the inclined plane, the wedge, and the screw. Simple machines are used daily and are often combined to create what is known as a compound machine. Compound machines include wheelbarrows, hoes, bicycles, corkscrews and can openers. Even the most complex machines designed by engineers are a combination of one or more of the six simple machines.
    [Show full text]