Table of Contents
What is jump phenomenon in cam and follower system?
Jumping happens when cam rotates at critical speed above certain value. at jumping, the speed is so high that the follower does not follow the cam and we get a sound of different type. Due to the compressive load applied by the spring, at higher speeds, follower moves without following the cam and thus jumping happens.
What is jump speed in cam follower mechanism?
The Critical Jump Speed of Cam is 460 rpm.
How can jump phenomenon be prevented?
Condition to avoid jump phenomenon – Theory of Machines – 2
- a. ω > √ (me) / ( P + 2 ke)
- b. ω > √( P + 2 ke) / (me)
- c. ω < √( P + 2 ke) / (me)
- d. ω < √ (me) / ( P + 2 ke)
What is jump off speed?
The airspeed at which paratroops can jump with comparative safety from an aircraft. Dictionary of Military and Associated Terms.
What is jump phenomenon?
A phenomenon occurring in a nonlinear system subjected to a sinusoidal input at constant frequency, in which the value of the amplitude of the forced oscillation can jump upward or downward as the input amplitude is varied through either of two fixed values, and the graph of the forced amplitude versus the input …
Which motion of follower is best for high speed cams?
Cycloidal motion
Hence for the high-speed engine, the cam follower should move with Cycloidal motion.
What are the different types of cam and follower?
Types of Follower:
- Knife edge follower.
- Roller follower.
- Flat-faced follower.
- Spherical follower.
- Radial follower.
- Offset Follower.
Why offset is provided in cam?
When the motion of the follower is along an axis away from the axis of the cam centre, it is called off-set follower. Offsets are required in cam and followers to reduce wear and side thrust.
What is base circle in cam?
Base circle It is the smallest circle that can be drawn tangential to the cam profile (contour) from the centre of rotation of a radial cam. The base circle decides the overall size of a cam and is, therefore, a fundamental feature of the cam.
What happens if the cam speed is too high?
Instead of cam, acceleration due to gravity “g” is responsible for the downward motion. As we know, “g” is limited by 9.81 m/s2. Here comes the problem, if the rotational speed of the cam is very high, it leads to accelerate the follower at a very high rate. No problem about the upward acceleration of the follower, the cam will take care.
Is the cam responsible for the downward movement of the follower?
In most of the cams such as disc cams, plate cams, the cam is responsible for upward movement of the follower. But interestingly the cam is not responsible for the downward movement (return) of the follower. Instead of cam, acceleration due to gravity “g” is responsible for the downward motion. As we know, “g” is limited by 9.81 m/s2.
What is the function of the cam in a disc cam?
(IC Engine Valve Operation) In most of the cams such as disc cams, plate cams, the cam is responsible for upward movement of the follower. But interestingly the cam is not responsible for the downward movement (return) of the follower. Instead of cam, acceleration due to gravity “g” is responsible for the downward motion.