| R
DIMENSION | The
point
where
the
motion
of
the
Z
axis
changes
from
rapid
traverse
to
a
programmed
feed
(usually
referred
to
as
the R dimension)
|
| R PLANE | Return position level in a hole axial direction, set up in the immediate vicinity
of a workpiece, in order to quicken hole machining operations when a canned
cycle is used repeatedly to machine holes.
|
| RACK | An array of gears spaced on a straight bar
|
| RADIAL | In a direction directly outward from the
center of a circle or sphere or from the axis of a
cylinder. The spokes of a wheel, for example, are
radial.
|
| RADIUS | The distance from the center of a circle to its
circumference (outside).
|
| RADIUS PROGRAMMING | Programming for turning in which the amount of movement along the X-axis
(or coordinates) is represented using radiuses.
|
| RAKE | That surface of a cutting tool against which the
chips bear while being severed. If this surface is less
than 90” from the surface being cut, the rake is
positive, if more, the rake is negative.
|
| RAM | That part of a shaper which moves back and
forth and carries the tool head assembly
|
| RANDOM
ACCESS
MEMORY
(RAM) | RAM (Random Access Memory) is the internal memory of the CPU for storing data, program, and program result. It is a read/write memory which stores data until the machine is working. As soon as the machine is switched off, data is erased.
|
| RAPID TRAVERSE | Feeding the tool at a speed (rapid traverse rate) specified in the CNC when a
positioning command is issued.
|
| RAPID TRAVERSE OVERRIDE | Manual control in which the operator can change the rapid traverse rate during
machining.
|
| RASTER
DISPIAY | A
display
in
which
the
entire
display
surface
is
scanned
at
a
constant
refresh
rate
|
| RASTER
SCAN | Line-by-line
sweep
across
the
entire
display
surface
to
generate
elements
of
a
display
image
|
| READ
ONLY
MEMORY
(ROM) | A
storage
device
generally
used
for
control
programme,
whose
content
is
not
alterable
by
normal
operating
procedures.
|
| READ | to
acquire
data
from
a
source. To
copy,
usually
from
one
form
of storage
to
another,
particularly
from
external
or
secondary storage to
internal storage. To
sense
the
meaning
of
arrangements
of
hardware. To
sense
the presence
of
information
on
a
recording
medium
|
| READER | A
device
capable
of
sensing
information
stored
in
an
off-line
memory
media
(cards,
paper
tape,
magnetic
tape)
and
generating
equivalent
information
in
an
on-line
memory
device
(register,
memory
locations)
|
| READER/PUNCHER INTERFACE | Interface between an input/output device and the CNC.
|
| REAL
TIME
CLOCK | The
circuitry
which
maintains
time
for
use
in
programme
execution
and
event
initiation
|
| REAL
TIME
OPERATION | Computer
monitoring,
control
or
processing
functions
performed
at
a
rate
compatible
with
the
operation
of
physical
equipment
or
processes
|
| REAMING, LINE | The process of reaming two or more
holes to bring them into very accurate alignment.
|
| RECALESCENCE | An increase of temperature that
occurs while cooling metal through a range of
temperatures in which changes in metal occur
|
| RECESS | An internal groove
|
| RECUTTING | Recutting is what happens when chips are not removed fast enough and the cutting tool hits them again. Recutting can result in a bad surface finish or excessive tool wear.
|
| REFERENCE
BLOCK | A
block
within
an
NC
programme
identified
by
an O or H in
place
of
the
word
address N and
containing
sufficient
data
to
enable
(This
block
should
be located
at
a
convenient
point
in
the
programme
which
enables
the
operator
to reset
and
resume
operation.
|
| REFERENCE POSITION | Specific position on the machine along an axis, relative to the origin of a
machine coordinate system.
|
| REFERENCE POSITION RETURN | Moving a specified axis to the reference position.
|
| REFERENCE POSITION RETURN CHECK | Checking that the tool has been successfully returned to the reference position.
This check is used by a program that is designed to return a tool to the
reference position.
|
| REFRESH | CRT.
display
technology
which
requires
continuous
restroking
of
the
display
image
|
| RELATIVE COORDINATE SYSTEM | Coordinate system established in reference to the coordinates set by the
operator using the CNC.
|
| RELIEF | A term for clearance or clearance angle.
|
| RELOCATABLE
POINT/SEQUENCE
OF
POINT
(ROBOTS) | A
point
or
sequence
in
a
robot
which
can
be
relocated
in
space
|
| REPAINT | Redraws
a
display
on
a
CRT
to
reflect
its
current
status
|
| REPEAT SEARCH | Searching for an address or word again by using the repeat key.
|
| REPEATABILITY | The
closeness
of
agreement
among
multiple
measurements
of
an
output,
for
the
same
value
of
the
measured
signal
under
the
same
operating
conditions,
approaching
frcm
same
direction,
for
full
range
traverses
|
| REPRODUCTIBILITY | The
closeness
of
agreement
among
repeated
measurements
of
the
output
for
the
same
value
of
input,
made
under
the
same
operating
conditions
over
a
period
of
time,
approaching
from
either
direction.
|
| RESET STATE | Initial state defined for a device.
|
| RESOLUTION | 1.
The
smallest
distinguishable
increment
into
which
a
signal
or
picture,
etc.
is
divided
in
a
device
or
system.
2.
The
minimum
positioning
motion
which
can
be
specified.
|
| RESOLVER | 1.
A
mechanical
to
electrical
transducer
(see
Transducer)
whose
input
is
a
vector
quantity
and
whose
outputs
are
components
of
the
vector.
2.
A
transformer
whose
coupling
may
be
varied
by
rotating
one
set
of
windings
relative
to
another.
It
consists
of
a
stator
and
rotor,
each
having
two
distributed
windings
90
electrical
degrees
apart.
|
| RETRACE FUNCTION | Causing a tool to move back along a path which it previously traversed
(reverse), then retracing the same path again (re-forward).
|
| RETRACT | Automatic operation in which the tool is retracted by a programmed amount.
|
| RETROFIT | work
done
to
an
existing
machine
tool
from
simply
adding
special
jigs
or
fixtures
to
the
complete
re-engineering
and
manufacturing,
and
often
involving
the
addition
of
a
numerical
control
system
|
| RETURN POINT LEVEL R PLANE | Level to which a tool is retracted from the bottom of a hole being created during
the execution of a canned cycle. This is either the point R level or initial
level.
|
| REWINDING A PROGRAM | Locating the beginning of a program.
|
| RIGID TAPPING | High-precision tapping achieved by controlling spindle rotation and drill axis
feed as two-axis linear interpolation so that no tapping pitch error occurs at
the bottom of the hole during acceleration/deceleration.
|
| ROBOT | An
automatic
device
which
performs
functions
ordinarily
ascribed
to
human
beings
|
| ROLL
(ROBOTS) | A
rotation
of
the
payload
or
tool
about
the
longitudinal
axis
of
the
wrist
|
| ROTARY AXIS | Axis (such as A, B, or C) that rotates about a linear axis in a machine.
|
| ROTARY AXIS ROLL-OVER FUNCTION | Rounding off a rotary axis coordinate to within 360.
|
| ROTARY TABLE DYNAMIC FIXTURE OFFSET | Automatically calculating an offset from a rotation center when the rotary table
rotates, thereby defining a workpiece coordinate system.
|
| ROTATIONAL COPY | Repetitive machining performed by rotating a subprogram-specified shape.
|
| ROTATIONAL HANDLE FEED AROUND TOOL TIP | Manually feeding a tool using a handle in such a way that, when the tool
direction is changed, the tool tip is held in the same position.
|
| ROUGHING | The fast removal of stock to reduce a
workpiece to approximate dimensions, leaving only
enough material to finish the part to specifications.
|
| ROUTINE | A
series
of
computer
instructions
which
performs
a
specified
task.
|
| RS-232-C | EIA standard specifying a binary serial data interface for input/output devices.
|
| RS-422 | EIA standard specifying a binary serial data interface for input/output devices.
|
| RULE, HOOK | A rule with a hook on the end for
measuring through pulley holes and in similar places
|
| RUN | The
execution
of
a
programme
on
a
computer.
|
| RUNNING FIT | A class of fit intended for use on
machinery with moderate speeds, where accurate
location and minimum play are desired.
|