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Mert Nihat İskender
Quick Return Mechanism is a device used in a reciprocating machine to make the return motion faster than the power motion.
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.
The disc, which is connected to the motor, rotates with fixed angular velocity and angular acceleration while the speed of other parts are always change since radius is non-stable.
Quick Return Mechanism is widely used at machines such as shaping machines. Purpose is create a high velocity .
High velocity means high impact.
To increase return speed we need to increase distance between pin and center of the rotating part.
Plexiglas is the fundamental material in our project. Plexiglas is used for rotating and moving parts and for base .
Plexiglas is chosen because of its easier processing and cost issues
Experiments done in two steps
First step
Use a camera (capability of taking photo in 0,2 seconds) in multiple frame mode.
Compare 2 selected photos. Since we know the time and position difference we can obtain average velocity of sliding bar
Second step
Record the rotation of the system while a chronometer takes the time.
After recording, calculate the frequency of the system (rad/s) and convert to rpm
With this method we can find the error as
“((theo. velocity – exp. velocity)/(theo. velocity))*100%” Velocity = angular velocity of the motor (rad/s)
