Cam Terminology

(Computer-Aided Designing/
Computer-Aided Manufacturing)
CAD is a general term for computer systems that are used to assist the manufacturing departments of companies in designing and drawing engineering plans. A computer system that assists the actual manufacturing process is called a CAM.
Cam A mechanical element that conveys kinetic motion through direct contact to a member on what is called a follower having a simple shape such as a knife edge, roller or flat surface.
Cam Base Radius The radius of the circle that is used as reference in determining the shape of a cam.
Cam Blank The stock of material prior to machining.

Cam Curve
The motion curve formed by the follower as it moves along the cam.

Cam Diameter
The outer diameter of the cam.

Cam Follower
A cam follower with a stud that has a rolling element, such as a needle roller, embedded between the outer ring and stud.

Camshaft Frictional
The camshaft frictional torque is the peak frictional torque of the camshaft (input shaft) without any loads.

Cartesian Coordinates
The x and y coordinates that represent the position of any given point over two axes that cross at a right angle on the same plane. On a three- dimensional plane, the z axis is also necessary as a coordinate.

Characteristics of
Cam Curve
The maximum or minimum values of velocity, acceleration, jerk and so forth, that can be produced by the cam curve.

Coefficient of Lubrication
Indicates the effect on the life of the material the formation of an oily film has. Derived by taking the ratio of the minimal dynamic viscosity required for a given operating speed to the dynamic viscosity at the operating temperature.

Coefficient of Material
The coefficient of life for bearings based on the production process of the material for the shaft bushings. Steel produced by vacuum degasification or vacuum dissolution has less non-metal intrusions compared to steel produced by air dissolution. The former is therefore stronger against flaking and has a longer life against roll fatigue.

Coefficient of Reliability
The life rating calculation for anti-frictional bearings is designed so that, statistically, the bearings live up to at least 90% of the calculation (90% reliability). Depending on the application, the life of the equipment may require more reliability. The coefficient of reliability is a compensation factor for life calculations to extend the amount of reliability. Note, indexing devices are calculated with a reliability of 95% (coefficient of reliability 0.62).

Coefficient of Torque
The coefficient of a mechanism consisting of several links from input drive system to the final follower. The coefficient of torque transmission indicates how the torque will be transmitted and is calculated by multiplying the speed ratios of each link in the mechanism.

Common Normal Line
A straight line perpendicular to the common tangent line that passes a common point where two curves meet.

Concave Globoidal Cam
A cylinder-shaped cam that is drawn in at the center.

Conjugate Cam
A cam consisting of two cams sandwiched between two rollers. The cam is arranged so that one cam is pressed against one of the followers which in turn presses against the other cam.

Contact Length
The length of the contact between two rolling members such as a cam and cam follower, needle and shaft or needle and outer ring. Necessary when calculating the pressure of contacted surface.

Contact Stress
The amount of stress that acts upon the curve formed by the contacted surfaces of two objects.

Convex Globoidal Cam
A solid cam with an expanded center.

Cutter Compensation
The difference in the size of the cutting tool and the cam follower is compensated in the normal direction in respect to the profile.

Cycle Time
The time consumed for a motion to make one complete cycle.

Cylindrical Cam
A solid cam that has the appearance of a cylinder. Also referred to as a barrel cam.

Cylindrical Coordinates
The amount The cylindrical polar coordinates represented by planar polar coordinated (r, φ) of leg H of a line drawn perpendicularly downward to xy from random point P in an area of space and height z. NOTE: Where 0 is the origin, r = OH, ∠ xOH = φ , and PH = z. These are related to Cartesian coordinates (x, y, z) as x = rcos (φ), y =r sin (φ), and z = z.of stress that acts upon the curve formed by the contacted surfaces of two objects.

Cylindrical Grooved Cam
A cylindrical blank with a groove cut along its perimeter in which a roller is guided through.