# Trigonometry and Quick Return Mechanism

Topics: Universiti Tenaga Nasional, Linkage, Experiment Pages: 7 (1132 words) Published: June 21, 2011
UNIVERSITI TENAGA NASIONAL
COLLEGE OF ENGINEERING
DEPARTMENT OF MECHANICAL ENGINEERING

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MEMB331 - MACHINE DESIGN AND CAD LABORATORY

EXP.TITLE : Crank And Slotted Lever Quick Return Motion Experiment

AUTHOR : FAKHRUL RAZI BIN ZAHARI

SID : ME082100

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ABSRTACT

A mechanism is a simplified model, usually in the form of a line diagram, which is used to reproduce exactly the motion occurring in machine. Some machine used in industry applied the crank and slotted lever quick return mechanism in the machine operation. So in this experiment we are to investigate the performance of this quick return mechanism. The apparatus used for this experiment also called crank and slotted lever quick return mechanism equipment by Norwood Instrument Ltd. The various parts of this mechanism are called links or elements. The quick return is caused by the variation of length of the links itself. This experiment is carried out by rotating the crank for a revolution (360°). Then the slider position value is read and recorded for each 10° increment. Finally the theoretical slider position value and slider velocity value and could be calculated for analyzing purpose.

OBJECTIVE

The objective of this experiment is to investigate the kinematics motion of a Crank and Slotted Lever Quick Return mechanism. The investigation is to show that it is indeed a quick return mechanism and to evaluate the increase in efficiency that this would offer if applied to a machine tool.

Data, Observations, Analysis & Results
|Crank Angle, θ ( |Experimental Slider Position, x (|Theoretical Slider Position, x |Percentage Error ( %) |Slider Velocity, v ( | |degree ) |mm ) |( mm ) | |mm/degree ) | |0 |69 |70 |1.43 |0 | |10 |78 |78.355 |0.45 |0.8 | |20 |85 |86.578 |1.82 |0.9 | |30 |94 |94.532 |0.56 |0.8 | |40 |100 |102.078 |2.04 |0.7 | |50 |107 |109.071 |1.9 |0.7 | |60 |113 |115.356 |2.04 |0.7 | |70 |119 |120.765 |1.46 |0.5 | |80 |124 |125.116 |0.89 |0.4 | |90 |127 |128.209 |0.94 |0.4 | |100 |129 |129.82 |0.63 |0.2 | |110 |129 |129.714 |0.55 |0...

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