What is cam profile used for?

What is cam profile used for?

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.

Why is a displacement diagram necessary to draw it before drawing a cam profile?

A Displacement Diagram is essentially a graph which plots the movement of a cam follower against time. Since the cam’s movement is usually constant then equal time intervals can be represented by equal distances along the horizontal axis and the resulting follower movement (or ‘displacement’) along the vertical axis.

What is engine cam profile?

The cam profile is the actual shape of the camshaft lobe. A flat tappet camshaft is slightly more pointed on the nose of the lobe, while a roller lift camshaft has a more rounded profile on the nose of the lobe. Degreeing the Camshaft. This is a process that synchronizes the camshaft with the crankshaft.

How does a cam work?

How does CAM work? The CAM system works by substituting hand-made jigs with software that defines the actions and processes of a machine directly. Computer-aided manufacturing software translates drawings and data into detailed instructions that drive automated tools/machines.

What are the uses of cam & follower?

Cam and follower are widely used for operating inlet and exhaust valve of I C engine. These are used in wall clock. These are used in feed mechanism of automatic lathe Machine. These are used in paper cutting machine.

What are the three types of cam?

Cams

• Circular. Circular cams use an off-centre pivot to cause the follower to move up and down.
• Pear. Pear cams are called this as they have the shape of a pear.
• Snail or drop. Snail or drop cams have the appearance of a snail shell.
• Heart-shaped or constant velocity.

What is the first step in drawing cam profile?

1 Draw the cam graph as shown. 2 Draw a 20 mm radius circle, and divide it into 30° divisions as shown. 3 Where the 30° lines touch the circumference of the 20 mm circle, draw tangents at these points. 4 Draw a circle of radius Q, as shown, from the centre of the camshaft to the centre of the roller follower.

Which type of cam is used for high speed engine?

Explanation: Cycloidal motion curve has the best dynamic characteristics. The acceleration is finite at all times and the starting and ending acceleration is zero. It will yield a cam mechanism with the lowest vibration, stress, noise and shock characteristics.

How do I know what cam to use?

Typically, a head with a high percentage can use a cam with more closely matched intake and exhaust lobe figures. Conversely, a head with a poor ratio between the intake and exhaust flow will benefit from more exhaust duration to evacuate the burned gases.

How to draw cam profile in AutoCAD?

Cam profile: Draw base circle and prime circle. Draw another circle of radius equal to the distance between cam center and follower pivot point. Take the line joining cam center and pivot point as reference and draw lines indicating successive angular displacements of cam. Divide these into same number of divisions as in the displacement diagram.

How do you make a cam profile?

Cam profile: Construct base circle. Mark points 1,2,3…..in direction opposite to the direction of cam rotation. Transfer points a,b,c…..l from displacement diagram to the cam profile and join them by a smooth free hand curve. This forms the required cam profile.

How does the CAM work?

As the cam rotates in an anticlockwise direction, the follower falls (diagram 2) and so does the arm of the toy. As the cam continues to rotate the arm begins to rise as seen in diagram 4. The cam shown is a pear shaped cam (named after its shape). CAM PROFILES

What is the purpose of a cam follower?

The basic purpose of using the cam follower is converting the rotary motion of the cam to the translating or oscillatory motion of the follower. Before going to the actual design of cam profile, let’s look at the basic terminologies. slide 2 of 4. Cam Follower Design Terminologies Cam: The cam is the driver.