This preview shows page 1. Sign up to view the full content.
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
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)
360 Experimental Slider Position, x (mm)...
View Full Document
- Spring '14