How does an eccentric cam move?
An eccentric cam is a disc with its centre of rotation positioned ‘off centre’. As it rotates it pushes the flat follower upwards and then allows it to drop downwards. The movement is smooth and at a constant speed. A mechanical toy based on a series of eccentric cams is seen below.
What is an eccentric cam used for?
It is most often employed in steam engines and used to convert rotary into linear reciprocating motion in order to drive a sliding valve or a pump ram. An eccentric cam usually has a groove at its circumference around which is closely fitted a circular collar (eccentric strap) attached an eccentric rod.
What is eccentricity in eccentric cam?
The eccentricity e of eccentric cam 1 can be changed by turning cam 1 with respect to disk 2 so that slot a of the cam slides along shaft A and bolt b along spiral slot c-c of disk 2. Then bolt b is tightened to secure the adjustment.
How do eccentric cam followers work?
Eccentric cam followers are used when there is a need to make height adjustments between the cam follower and the track. By simply turning the entire cam follower inside the housing it is possible to adjust the distance between the cam follower and the track by twice the eccentricity.
What is eccentric wheel?
The eccentric wheels increase the under-body clearance, and change the body trajectory from straight to trochoid curve, which has the same shape as the crank legs but opposite phase trajectory. Thus, the body itself acts as a “second” crank leg.
Which cam can only work in one direction?
Snail or drop cams have the appearance of a snail shell. It causes the follower to remain stationary for half a turn before gently rising and suddenly falling. They can only work by rotating in one direction.
Where is eccentric used?
It is used most often in steam engines, and used to convert rotary motion into linear reciprocating motion to drive a sliding valve or pump ram. To do so, an eccentric usually has a groove at its circumference closely fitted a circular collar (eccentric strap).
Where is eccentric turning used?
As in turning on a lathe with the workpiece not concentric with the spindle axis. This is a common need when building engines, for example, to machine the throws of a crankshaft, or the eccentric drive used by a steam engine to operate a slide valve.
What is eccentric shaft?
The eccentric shaft is an essential part of the fully variable valve lift control. The valve lift changes continuously from maximum to almost zero by rotating / pivoting the eccentric (shaft) by means of an electric motor. This shaft had to be “built” as a precision needle bearing is used between the eccentrics.
What is concentric and eccentric movement?
In a concentric contraction, the muscle tension rises to meet the resistance then remains stable as the muscle shortens. During eccentric contraction, the muscle lengthens as the resistance becomes greater than the force the muscle is producing.
Is a cam follower a lifter?
The cam follower is a cylindrical device that tracks the shape of the cam lobe and reciprocates the movement to the opening and closing of the valves in the combustion chamber. The follower drives a piston that is enclosed in a cylindrical casing. This casing-piston assembly is known as the lifter.
What is follower and Iscam?
In mechanical engineering, engineers often use a higher pair links mechanism that is renowned as Cam and Follower Mechanism. This pair of higher links are used to move links spontaneously or periodically. Although, cam and follower mechanisms are also used by engineers for ensuring zero or minimum degree of error.
Which is an example of an eccentric cam?
The T Bolt locking system shown below, is an excellent example of a eccentric cam at work. When the lever is vertical, the system is unlocked and material can be placed in position, or removed from under the drilling area. When the lever is pushed down to a horizontal position, the material is locked in place. It is now safe to drill.
What kind of motion can a cam and follower do?
Cam and Follower The cam and followeris a device which can convert rotary motion (circular motion) into linear motion (movement in a straight line, in ONE direction). Followers Cams
How does the CAM work on a French engine?
The cam is triangular, with curved faces, and rotates between the two parallel working faces of a cam frame on the sliding bar. While the outer face of the cam engages the frame the bar is held stationary. This is a form of cam motion used in place of an eccentric for operating the valve of a certain French engine.
How does a cam work on a churn?
A recently patented mechanism for imparting power to the dasher shaft of a churn. A rocking movement is imparted to the shaft from a rotating cam. At the upper end of the shaft is a forked piece or follower mounted to turn in a socket at right angles to the axis of the shaft.