Abstract
Quick Return Mechanisms (QRMs) are one of the essential accessories used in machine tools which involve reciprocating cutting action with a quick return stroke and a constant angular velocity of driving crank. The aim of this work was to simulate, design and construct a prototype of a QRM that can be used for demonstration and instrumentation. The QRM was simulated using Solidworks and a prototype was developed from the simulated results. The experiment was conducted using the prototype. The kinematic simulation of the Solidworks model was compared with the kinematics of motion of the prototype. The result showed that the Percentage Stroke Length error was 0.36%. It was observed that, there was no significant difference in the simulated and experimental results, hence, the prototype can be used for demonstration and experimentation to assist students in understanding basic principles of the machine operation.
Highlights
Assemblage of resistant bodies, connected by movable joints, in order to form a closed kinematic chain with a fixed link for the purpose of motion transmission is known as Mechanism
The relationship between the slider displacement from the crank center measured in meters and the crank angular displacement measured in degrees are shown in as plotted with the use of EXCEL are shown in Figure 4, significant points have been labeled and explained as Return/forward stroke and Working/Backwards Stroke:
Results from the Prototype Constructed The experimental results obtained from the prototype constructed shows that The Stroke Length (S) for the prototype is given as the difference between the highest slider displacement and the lowest slider displacement, S = 0.275-0 = 0.275 m
Summary
Assemblage of resistant bodies, connected by movable joints, in order to form a closed kinematic chain with a fixed link for the purpose of motion transmission is known as Mechanism. Such mechanism known as Quick return mechanism are the essential part used in reciprocating cutting tool with a quick return stroke having constant angular velocity of driving crank. Forward stroke the velocity of slider reduced gradually to zero by the time the slider was at full stroke [3] This proved that the elliptical gears wear designed correctly and an alternate mechanism to that of QRM is designed successfully
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