Whitworth's Quick Return Motion Experiment

Thus the overall performance of the mechanism is to

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Unformatted text preview: l. Thus the overall performance of the mechanism is to provide a high power forward cutting stroke with a low power and higher speed quick return in preparation for the next cut. Universiti Tenaga Nasional, 2006 Mechanical Design and CAD Laboratory APPARATUS Whitworth’s Quick Return Mechanism Universiti Tenaga Nasional, 2006 Mechanical Design and CAD Laboratory PROCEDURES 1) Set the drive crank so that the pointer is at zero on the scale. Note the slider position. 2) Rotate the crank by 10º increments and for every increment, note the corresponding slider position. 3) Repeat the process for a full 360º. RESULTS 1) Plot a graph of slider position versus crank angle. 2) Show the return and cutting strokes on the graph plotted. 3) Plot a graph of slider velocity versus crank angle. On the graph, show the return and cutting strokes. DISCUSSION 1) At what crank angles do the limits of the slider position occur? 2) What percentage of the crank revolution is occupied by each stroke? 3) Comment on the form/shape of the graph plotted. 4) Verify that the motion does have a quick return stroke and slow cutting stoke. 5) Discuss about the variable power distribution during the cycle of this mechanism. Universiti Tenaga Nasional, 2006 Mechanical Design and CAD Laboratory RESULT SHEET Whitworth’s Quick Return Mechanism Experiment Crank Angle, θ (degree) 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 360 Experimental Slider Position, x (mm)...
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