What do the camshaft numbers mean?
The are two measurements, duration and valve lift. The duration of measured in degrees ex 278, 288 like you gave. This measures how long the valve will stay open. For example, 278 degrees of rotation of the roller the valve will be closed. The other 82 degrees of rotation is where the valve will be open.
Which of the following parameters are relevant in designing cam profile?
The pressure angle is important in cam design because it represents the steepness of the cam profile.
What is cam in machine design?
A cam is an oscillating or sliding piece in a mechanical linkage used especially in transforming rotary motion into linear motion. It is often a part of a rotating wheel (e.g. an eccentric wheel) or shaft (e.g. a cylinder with an irregular shape) that strikes a lever at one or more points on its circular path.
What is the law of cam design?
The Fundamental law of Cam Design. Any cam designed for operation at other than very low speeds must be designed with the following constraints: The cam function must be continuous through the first and second derivatives of dis- placement across the entire interval (360 degrees).
How do you read cam specs?
Reading a Cam Card: Lobe Separation Angle (LSA) On this cam card, you will see the LSA is 112 degrees. This figure is derived by adding the intake center line plus the exhaust center line and dividing by two. In this case: 108 + 116 = 224 degrees / 2 = 112 degrees.
How is a camshaft profile measured?
Take your digital caliper and measure the smallest diameter on the cam. This is called the base circle. This cam measured at 1.10 inches and 87 thousandths. The next value you will need is the largest diameter on the cam, the lobe part, which is called the base circle and lobe lift.
What is camshaft profile?
The camshaft profile refers to the shape of the individual lobes. The camshaft pattern refers how the profile of the intake and exhaust lobes compare to each other.
What is cam and its classification?
According the shape cams are radial, face, wedge, cylindrical, spherical, helical, conical, 3 dimensional ,etc. Cam pairs are classified as force closed or form closed. Force closed cam pairs are more common since it is expensive to manufacture form closed cams.
What is pitch circle in cam?
Pitch circle: A circle from the cam center through the pitch point. The pitch circle radius is used to calculate a cam of minimum size for a given pressure angle. Prime circle (reference circle): The smallest circle from the cam center through the pitch curve.
What is Prime circle in cam?
The prime circle is only applicable to cams with roller followers and is measured to the cen- ter of the roller follower. The prime circle is defined as the smallest circle which can be drawn tangent to the locus of the centerline of the follower as shown in Figure 7-1 for a radi- al cam.