Design Project
Name & Surname: Lebohang Eric Sithole
Student no.: 223051736
Activity 1.1
Topic: Design an innovative cam-follower mechanism powered by a spur gearbox to
control the movements of a prosthetic hand to enhance its ability and functionality.
Questions and answers
1. What is a cam follower mechanism?
It is a mechanical device that transforms rotational motion into linear or reciprocating
motion, and it is made up of two primary parts: the follower and the cam.
2. How does the cam follower mechanism function and how can it be powered?
The mechanism of the cam-follower converts rotational motion into either linear or
reciprocating motion. The cam, which is often a spinning or sliding component with a
specified profile, pushes against the follower as it moves. The profile shape of the
cam controls the follower's movement pattern, including its up-and-down and side-toside movements. Different parts of the cam's profile make contact with the follower
as it spins, causing the follower to move in a predictable and controlled manner as it
follows the shape of the cam. This mechanism converts simple rotating input into
complicated motion patterns for a variety of applications.
Several power sources, especially an electric motor, can power the cam-follower
system. The rotational motion required to drive the cam is supplied by the motor. A
manually turned crank or another mechanical system, such as a belt or chain drive
attached to a bigger machine, may occasionally drive the mechanism. Precise
control over the output of the mechanism is possible in powered applications
because the rotational speed of the motor may be adjusted to modify the follower's
movement speed and timing. The movement of the cam can be connected with other
mechanical systems in more complex configurations, improving overall usefulness,
by using sensors and controls.
3. What are the components of the cam follower mechanism?
• Cam
• Follower
• Frame or Support
• Return Mechanism (spring)
• Drive mechanism (motor)
4. How can it move a prosthetic hand to enhance its ability and functionality?
By precisely directing the movement of a prosthetic hand's fingers and joints, a camfollower system can improve the hand's functioning. The profile of the cam is made
to resemble the hand's natural flexing, pinching, and grasping movements. The
follower, which is attached to the prosthetic fingers, moves in a certain pattern
determined by the cam's form as it rotates. As a result, the prosthetic hand can
replicate the intricate and well-coordinated movements of a normal hand. Accurate
and responsive hand movements are guaranteed by the cam-follower mechanism's
smooth and predictable operation.
The prosthetic hand can accomplish independent and synchronized finger
movements, enabling it to carry out a range of tasks, by employing numerous cams,
each of which controls a separate finger or joint. An abrupt cam profile could result in
a sudden pinch, whereas a cam with a steady inclination can offer a slow, controlled
hold. The required torque and speed control can be supplied by a motor coupled to a
spur gearbox, which powers the mechanism. By adjusting its grip strength and speed
according to the job at hand, the prosthetic hand becomes more versatile and
functional.
Furthermore, adding feedback sensors to the system can improve the prosthetic
hand's functionality even more. These sensors can track the location and force
applied by the fingers, giving the control system data in real time. This enables
adaptive control, in which the cam-follower system can modify its motions in reaction
to outside stimuli, including an object's texture or hardness. The cam-follower
mechanism is an efficient way to increase the flexibility and usefulness of a
prosthetic hand because of its precise control, adaptability, and responsive feedback.