Safety Glossary

J - L

J  

JOB SAFETY ANALYSIS : A formal hazard identification process that documents the hazards associated with a specific task, and provides a formal written safe work procedure. (B-11 Definitions Manual)

JOG:  An intermittent motion imparted to the slide by momentary operation of the drive motion, after the clutch is engaged with the flywheel at rest.

JOG BAR: A bar or rod running through the length of the [machine] that is used for jogging. (B-11 Definitions Manual)

JOG MODE: An operating mode of a full revolution clutch press wherein an intermittent motion is imparted to the slide by momentary operation of the drive motor after the clutch is engaged with the flywheel at rest. (B-11 Definitions Manual)
  
JOINT:  Rotary or translational (sliding) couplings between adjacent links in an articulated kinematic chain. (R15.07)

JOINT ACCELERATION:  The time rate of change of joint velocity.  (R15.07)

JOINT COORDINATE SYSTEM :  A coordinate system referenced to the joint axes, the joint coordinates of which are defined relative to the preceding joint coordinates or to some other coordinate system.  (ISO 8373)

JOINT DISPLACEMENT:  The signed magnitude of the change in position of a joint.  (R15.07)

JOINT MOTION:  A method for coordinating the movement of the joints such that all joints arrive at the desired location simultaneously.  (R15.06)

JOINT VELOCITY:  The time rate of change of joint displacement.  (R15.07)

JOYSTICK:  A manually controlled device whose variable position and orientation or applied forces are measured and result in commands to the robot control system.  (ISO 8373) 

K  

KEY TRANSFER :  A system that uses one or more key operated interlocks, installed external to the hazard area of the production system, to permit operation only in a prearranged sequence. (B-11 Definitions Manual)

KINEMATIC COORDINATE SYSTEM:  A coordinate system at the beginning of the kinematic chain defined by the robot manufacturer and referenced to the base coordinate system.  (R15.07)

KINEMATICS, FORWARD:  The mathematical relationship which determines the pose of the robot Tool Coordinate System TCS based on the values of the principal joint displacements. (R15.07)

KINEMATICS, INVERSE:  The mathematical relationship which determines the principal joint displacements based on the values of the robot Tool Coordinate System TCS.  (R15.07)

KNOCKOUT:  A mechanism for releasing material from either die. 

L

LEAD SCREW :  On a lathe, a power screw used to feed the tool when chasing threads. (B-11 Definitions Manual)

LEARNING CONTROL:  A control scheme whereby the experience obtained during previous cycles is automatically used to change control parameters and/or algorithms.  (ISO 8373)

LED:  Light emitting diode used to indicate device status.

LIFTOUT:  The mechanism for releasing the material or workpieces(s) from the lower dies. (B-11 Definitions Manual)

LIGHT CURTAIN:  An array of photoelectric sensing beams configured to sense objects passing anywhere through an area (sensing plane).  Some light curtains process the data from the array to measure the profile of the object or track its movement with the array.

LIMITING DEVICE:  A device that restricts the maximum envelope (space) by stopping or causing to stop all robot motion and is independent of the control program and the application programs. (R15.06)

LIMITING LOAD:  The maximum load stated by the manufacturer which can be applied to the mechanical interface without any damage or failure to the robot mechanism under restricted operating conditions.  (ISO 8373)

LINE VOLTAGE:  The normal in-plant power line supply voltage which is usually 120 or 220-240 VAC.

LINK:  A rigid body which maintains a fixed relationship between joints. (ISO 8373)

LINK COORDINATE SYSTEM:  A coordinate system attached to the link. (R15.07)

LOAD:  The force and/or torque at the mechanical interface which can be exerted along the various directions of motion under specified conditions of velocity and acceleration.  The load is a function of mass, moment of inertia, and static and dynamic forces supported by the robot.  (ISO 8373).

LOCKOUT/TAGOUT: The placement of a lock (or tag) on an energy isolating device, such as a disconnect switch or shut-off valve, in accordance with established safe work procedure. (B-11 Definitions Manual)  

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