How does a cam and follower work?
How does a cam and follower work?
A cam and follower mechanism is a profiled shape mounted on a shaft that causes a lever or follower to move. Cams are used to convert rotary to linear (reciprocating) motion. As the cam rotates, the follower rises and falls in a process known as reciprocating motion.
What is a cam and follower used for in real life?
The cam and follower mechanism is widely used for operating the inlet and exhaust valves of internal combustion engines. They are used in wall clocks and the feed mechanism of automatic lathe machines. They are also used in paper cutting machines and weaving textile machinery.
How the cam and follower are classified?
Cams can be classified based on their physical shape. 4.1a and b): The disk (or plate) cam has an irregular contour to impart a specific motion to the follower. The follower moves in a plane perpendicular to the axis of rotation of the camshaft and is held in contact with the cam by springs or gravity.
Does a cam and follower increase speed?
Yes it is reversible. A Cam and Follower is very similar to a crank and slider. The input is always a gear called a cam which is shaped similar to a half moon. Since the input and the output are not similar and do not have teeth there is no gear ratio and no change in torque and speed.
What is dwell period of cam?
Rise is the motion of the follower away from the cam center, dwell is the motion during which the follower is at rest; and return is the motion of the follower toward the cam center.
What is the process of cam?
Computer Aided Manufacturing (CAM) is the use of software and computer-controlled machinery to automate a manufacturing process. Machinery that can turn raw material into a finished product. Post Processing converts toolpaths into a language machines can understand.
What happens to the motion of a cam follower?
However, this action results in an increase in the average rate of rise or fall of the follower. 2 Uniform acceleration and retardation motion is shown in Fig. 24.4. The graphs for both parts of the motion are parabolic.
Which is a higher pair, the cam or the follower?
The Cam and the follower have a line contact and constitute a higher pair. Higher pair: When the motion between the two elements is partly turning and partly sliding, then the pair is known as a higher pair. The cam is usually located on shafts and rotates at the uniform speed, whereas the follower motion will be based on the shape of the Cam.
What is the dwell period of a cam follower?
150-210°, dwell period. 210-270°, follower falls 20 mm with uniform acceleration. 270-360°, follower falls 30 mm with uniform retardation. 1 Draw the graph as shown. Exact dimensions are used for the Y axis, where the follower lift is plotted. The X axis has been drawn to scale, where 12 mm represents 30° of shaft rotation.
How is the cam profile generated in a follower?
By this point, we can trace the cam profile. This curve is generated if we assume the cam is fixed and the tracepoint of the follower moves around the cam. It is formed between normal to the pitch curve and line of motion of the follower. At this point the pressure angle is maximum.