
APPENDIX
B–63194EN/02
I. GLOSSARY
785
Term Description
Laser beam on/off control Turning on and off a laser beam. A laser beam can be turned on and off either
manually or automatically.
Laser sequence control Control applied to the series of operations from activation to stop of the laser os-
cillator. Control of a carbonic gas laser oscillator and that of a YAG laser oscillator
are supported.
LCD/MDI Panel which incorporates both a liquid crystal display (LCD) panel and a manual
data input (MDI) keyboard. Used to display and set programs and data in the
CNC.
Leader section Program component used as a program file header.
Leading edge compensation Offsetting a tool path by the tool radius so that the tool edge coincides with a pro-
grammed path if the tool (tool axis) is oriented in an arbitrary direction in three–di-
mensional space.
Least command increment The smallest unit of controlled axis movement that can be specified by the CNC
or PMC.
Least input increment The smallest unit of data that can be input to a program.
Linear acceleration/ deceleration after
cutting feed interpolation
Linear acceleration/deceleration applied to a specified cutting feedrate, in which
the post–interpolation cutting feedrate is proportional to the elapsed time.
Linear acceleration/ deceleration before
cutting feed interpolation
Linear acceleration/deceleration applied to a specified cutting feedrate, in which
the pre–interpolation cutting feedrate is proportional to the elapsed time.
Linear axis Axis along which a machine element moves linearly with the X–, Y–, or Z–axis
of the machine coordinate system, or axis parallel to that axis.
Linear copy Repetitive machining performed by moving a subprogram–specified figure in
parallel.
Linear interpolation Obtaining a path necessary to move the tool along a straight line.
Linear interpolation type positioning Positioning in which the tool path coincides with a path obtained by linear inter-
polation.
Load meter display Representing as a bar graph, the load ratio of a servo motor or spindle motor rela-
tive to its rated load as 100%.
Local coordinate system Coordinate system defined in a workpiece coordinate system in order to facilitate
programming based on the workpiece coordinate system.
Local variable Macro variable that can be independently used in individual custom macro pro-
gram.
Look–ahead control Enabling high–speed, high–precision machining by suppressing acceleration/
deceleration delays and servo delays that would otherwise become larger with
increases in the feedrate.
[M]
M code Coded number, following the M address, that specifies a miscellaneous function.
M code group check function Checking that the combination of M codes specified in a block is valid.
M code group function Displaying M codes by group and checking that the combination of M codes spe-
cified in a block is valid.
M codes for tool post synchronization M code that causes a tool post to wait for another during machining.
M function Specifying machine operations such as start and stop of the spindle and the end
of a program.
Machine coordinate system Coordinate system whose origin is defined as being the machine zero point, a
machine–specific point which acts as a reference point for the machine
Machine lock Changing position displays, without moving the controlled axes, for program
checking.
Machining time stamp function Measuring the time required to execute a program, on a memory operation basis,
and displaying the measured time on the CNC screen. The measured time is
written as a comment in the program.
Macro call Calling a custom macro program for execution, passing parameters.