whitworth quick return mechanism
TRANSCRIPT
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Whitworth Quick Return Mechanism
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INTRODUCTION
The 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.
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Theory
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History
cutting machine by Sir Joseph Whitworth
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Applications
Rotary engines
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Power driven Saw machine
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Shaping machine
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Water pumping system
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Slider Crank Mechanism
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Whitworth (Quick return) Mechanism
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Kinematic Analysis of the Whitworth Quick Return Mechanism (FIG 1)
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Position Analysis
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Velocity Analysis
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Acceleration Analysis
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Dynamic Analysis of the Whitworth Quick Return Mechanism
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Forces on Each Member
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Figure3 FBD of link 2
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Figure 4 FBD of link 3
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Figure 5 FBD of link 4
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SIMULATION ON SOLIDWORKS AND ADAMS
VIEW
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SOLIDWORKS
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SOLIDWORKS PARTS
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STRESS ANALYSIS
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STRAIN ANALYSIS
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WORKING ON ADAMS
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SIMULATION ON ADAMS (SLIDER)
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SIMULATION (CRANK)
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SIMULATION (MAIN)
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THANK YOU
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References http://www.robotee.com/LR/51029_Robotee-com-WhitWorthCQuickReturn-mechanism.pdf
http://metalab.uniten.edu.my/~kamal/documents/Machine%20Design%20Lab/Laboratory%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/Laboratory%20Manual/Whitworth's%20Quick%20Return%20Motion%20Experiment.pdf
http://library.wolfram.com/infocenter/TechNotes/5908/