1. 1. Whitworth Quick Return Mechanism
2. 2. INTRODUCTIONThe Whitworth quick return mechanism converts rotary motion into reciprocating motion, but unlike the crank and slider, the forward reciprocating motion is slower rate than the return stroke. This is why it is called quick return mechanism. This mechanism is made of a driving crank and of a driven slider crank. In the considered configuration, the fixed pivot of the driven crank is located on the outside of the circle on which the end of the driving crank moves. This leads to an alternated motion of the slider crank. The angular speed of the driven crank is variable. The duration of the motion for its part corresponding to the blue arc is shorter than the one related to the red arc. This is why this device is named quick return mechanism, which was used in crank shapers, with the slow part or the stroke being used for the working time of the tool and the quick part for the non-productive time.
3. 3. Theory
4. 4. History cutting machine by Sir Joseph Whitworth
5. 5. Applications Rotary engines
6. 6. Power driven Saw machine
7. 7. Shaping machine
8. 8. Water pumping system
9. 9. Slider Crank Mechanism
10. 10. Whitworth (Quick return) Mechanism
11. 11. Kinematic Analysis of the Whitworth Quick Return Mechanism (FIG 1)
12. 12. Position Analysis
13. 13. Velocity Analysis
14. 14. Acceleration Analysis
15. 15. Dynamic Analysis of the Whitworth Quick Return Mechanism
16. 16. Forces on Each Member
17. 17. Figure3 FBD of link 2
18. 18. SIMULATION ON SOLIDWORKS AND ADAMS VIEW
19. 19. SOLIDWORKS
20. 20. SOLIDWORKS PARTS
21. 21. STRESS ANALYSIS
22. 22. STRAIN ANALYSIS
23. 23. WORKING ON ADAMS
24. 24. SIMULATION ON ADAMS (SLIDER)
25. 25. SIMULATION (CRANK)
26. 26. SIMULATION (MAIN)
27. 27. THANK YOU
28. 28. References http://www.robotee.com/LR/51029_Robotee-com-WhitWorthCQuickReturn- mechanism.pdf http://metalab.uniten.edu.my/~kamal/documents/Machine%20Design%20Lab/Laborat ory%20Manual/Whitworth's%20Quick%20Return%20Motion%20Experiment.pdf http://www.tcsme.org/Papers/Vol33/Vol33No3Paper9.pdf https://www.youtube.com/watch?v=XT4zt7sYPe0 http://www.mekanizmalar.com/simple_whitworth_quick_return_mechanism.html http://jeanlouis.blanchard.pagesperso- orange.fr/english_swf/ppe_fst_quick_return.html http://textofvideo.nptel.iitm.ac.in/112104121/lec7.pdf http://metalab.uniten.edu.my/~kamal/documents/Machine%20Design%20Lab/Laborat ory%20Manual/Whitworth's%20Quick%20Return%20Motion%20Experiment.pdf http://library.wolfram.com/infocenter/TechNotes/5908/