| LAG | Delay
caused
by
conditions
such
as
capacitance,
inertia,
resistance
or
dead
time
|
| LAG OF SERVO SYSTEM | State in which the feed axis of a machine lags behind the corresponding feed
command.
|
| LAND | That surface on the periphery of a rotary
cutting tool, such as a milling cutter. drill tap, or
reamer, which joins the face of the flute or tooth to
make up the basic cutting edge
|
| LANGUAGE | A
set
of
representations
and
rules
used
to
convey
information
|
| LAP | A tool made of soft metal and charged With fine
abrasives for precision finishing of metal surfaces.
Also, to perform the operation using a lap
|
| LARD OIL | A cutting oil made from animal fats usually
mixed with mineral oils to reduce its cost and
improve its qualities.
|
| 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 oscillator. Control of a carbonic gas laser oscillator and that of a YAG laser oscillator are supported.
|
| LAYOUT | A
visual
representation
of
a
complete
physical
entity
usually
to
scale
|
| 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.
|
| LEAD | The distance a thread will advance along its
axis in one complete revolution. Also, a heavy, soft’,
malleable metal having a low melting point. It has a
bright. silvery color when freshly cut or poured and
turns to a dull gray with aging.
|
| LEAD SCREW | The long, precision screw located in
front of the lathe bed geared to the spindle, and used
for cutting threads. Also, the table screw on the
universal milling machine when geared to the
indexing head for helical milling
|
| 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
programmed path if the tool (tool axis) is oriented in an arbitrary direction in
three-dimensional 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.
|
| LEVEL | 1.
Formerly
a
channel
of
punched
tape.
variable
quantity
applying
particularly
to
sound
or
electronic
signals
3.
The
degree
of
expressed
in
decibels,
volts,
amperes,
or
watts.
subordination
in
a
hierarchy.
|
| LIGHT
PEN | A
photo
sensing
device
similar
to
an
ordinary
fountain
pen
which
is
used
to
instruct
CRT
displays
by
means
of
light
sensing
optics.
|
| LIMITS | The smallest and largest dimension which are
tolerable (allowed).
|
| LINE
PRINTER | A
printing
device
that
can
print
an
entire
line
of
characters
all
at
once
|
| LINEAR
INTERPOLATION | A
function
of
a
control
whereby
data
points
are
generated
between
given
co-ordinate
positions
to
allow
simultaneous
movement
of
two
or
more
axes
of
motion
in
a
linear
(straight
line)
path.
|
| 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
interpolation.
|
| LINKAGE | A
means
of
canmunicating
information
from
one
routine
to
another
|
| LIP OF A DRILL | The sharp cutting edge on the end of a
twist drill.
|
| LIVE TOOLING | Axial or radial driven tools held in the turret of a lathe and used to perform secondary operations such as drilling or tapping.
|
| LOAD METER DISPLAY | Representing as a bar graph, the load ratio of a servo motor or spindle motor
relative to its rated load as 100%.
|
| LOADING | A condition caused by grinding the wrong
material with a grinding wheel or using too heavy a
grinding action.
|
| 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
program.
|
| LOCKOUT
SWITCH | A
switch
provided
with
a
memory,
which
protects
the
contents
of
designated
segments
from
alteration
|
| LOG
OFF | The
completion
of
a
terminal
session.
|
| LOG
ON | The
beginning
of
a
terminal
session.
|
| LOG | A
detailed
record
of
actions
for
a
period
of
time
|
| LOGIC
LEVEL | The
voltage
magnitude
associated
with
signal
pulses
representing
ONES
and
ZEROS
in
binary
computation.
|
| LOGIC | 1.
Electronic
devices
used
to
govern
a
particular
sequence
of
operations
in
a
given
system.
2.
Interrelation
or
sequence
of
facts
or
events
!
1
LOGIC
when
seen
as
inevitable
or
predictable
|
| 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.
|
| LOOP
TAPE | A
short
piece
of
tape,
containing
a
complete
programme
of
operation,
with
the
ends
joined
|
| LSI | Large
Scale
Integration
-
A
large
number
of
interconnected
integrated
circuits
manufactured
simultaneously
on
a
single
slice
of
semi-conductor
material
(usually
over
100
gates
or
basic
circuits,
with
at
least
500
circuit
elements)
|