Cam Terminology

Tapered Rib Ribs with a tapered cross section. Tapered ribs have a linear contact with the perimeter of the cam follower. Roller gear cams have tapered ribs.
Tempering A treatment process where heat-quenched steel is reheated to 200℃ or more or between 400℃ or 600℃ to decrease the hardness of the steel and strengthen the toughness.

3-Dimensional Cam
See Solid Cam.

Time Chart
Time charts indicate the distribution of time for the displacement of the output shaft. The displacement of the output shaft is dictated by the profile of the cam attached to the input shaft. The entire displacement of the output shaft can be charted by plotting the rotating angle of the cam on the horizontal axis and the displacement of the output shaft on the vertical axis and drawing a line between each point of displacement.

Top Dead Point
In a reciprocating motion such as the motion of a piston in a crank and piston mechanism, the extreme ends of the stroke in both directions are designated as the top dead point and the bottom dead point, respectively. Which end is designated as the top dead point usually depends on the direction of the motion. In general, the upper end of the operating range of the mechanism is defined as the top dead point of that mechanism.

The amount of force that acts upon the shaft multiplied by the length of the arm that extends to the operating line of that force. Expressed in units of kgf-m.

Torque Compensation
A cam used to control torque compensation. In cam mechanisms, the input and output shafts are subject to positive torque during the first half of an index and negative torque during the latter half. Torque compensation refers to neutralizing (or compensating) torques by applying the reverse torque by means of inertia or spring force.

Torque Limiter
A device used to protect against unexpected and undesired overloads. Torque limiters work by terminating the transmission of torque between two mechanical elements when an excessive amount of torque is detected.

Track Allowable Load
The load of the outer ring of the cam follower that can be applied to the track surface of the cam without causing deformity or pressure marks on the cam surface.

Track Surface
The surface along which an object is rolled such as the surface of the cam along which the outer ring of the cam follower rolls.

Transient Vibration
Irregular vibrations.

Translating Cam
A cam which takes a linear input such as that from a hydraulic cylinder. In general, cams take a rotary input.

Translating Follower
A follower that is driven by a cam to produce a linear displacement.

The follower to which the cam followers are attached. Turrets are the actual means of communicating the physical information of the cam on the input shaft to the output shaft.

Two-Dwell Motion,
Dwell-Rise-Dwell Motion
A motion with a dwell at both ends of a stroke.