| B AXIS | the
axis
of
rotary
motion
of
a
machine
tool
member
or
slide
about
the
Y
axis
|
| B CODE | Coded number, following the B address, that specifies the second auxiliary
function or index table indexing.
|
| B SPLINE | The programmed B spline positions are not intermediate points but simply "checkpoints". Instead of passing directly through these checkpoints, the curve merely passes in their vicinity (1st, 2nd or 3rd degree polynomials).
|
| B-AXIS CONTROL FUNCTION | Drilling or boring performed using an axis (B-axis) that operates independently
of the two basic axes (X and Z) of a lathe.
|
| BABBITT | An antifriction metal alloy used for bearing
inserts; made of tin, antimony, lead, and copper.
|
| BACK GEARS | Gears fitted to a machine to increase the
number of spindle speeds obtainable with a cone or
step pulley belt drive
|
| BACK RAKE | The angular surface ground back from
the cutting edge of cutting tools. On lathe cutting
tools. the rake is positive if the face slopes down from
the cutting edge toward the shank, and negative if the
face slopes upward toward the shank.
|
| BACKGROUND | In
computing
the
execution
of
low
priority
work
when
higher
priority
work
is
not
using
the
computer
|
| BACKGROUND EDITING | Editing a program during the execution of another program.
|
| BACKGROUND GRAPHIC DISPLAY | Drawing a machining path specified by a program during the execution of
another program.
|
| BACKGROUND PROCESSING | The
automatic
execution
of
computer
programmes
in
background
|
| BACKLASH | A
relative
movement
between
interacting
mechanical
parts, resulting
from
looseness
|
| BACKLASH COMPENSATION | Compensation for mechanical backlash.
|
| BALACE CUT | Machining a thin workpiece by cutting it from both sides in order to prevent the
workpiece from deforming, thereby achieving a high level precision.
|
| BAND | The
range
of
frequencies
between
tvro
defined
limits
|
| BANDSAW | A power saw with a long, sharp blade consisting of a continuous band of toothed metal stretched between two or more wheels to cut material.
|
| BAR STOCK | Metal bars of various lengths, made in
flat, hexagon, octagon, round, and square shapes from
which parts are machined
|
| BASE | A
number
base.
A
quantity
used
implicitly
to
define
some
system
of
representing
numbers
by
positional
notation.
Radix
|
| BASE AXIS | Axis whose setpoint or actual value is employed in calculating a compensatory value.
|
| BASE POINT | Start point of a pattern function program, such as the position of the tool when
a pattern function is specified or the position that is identified with coordinates
specified using a base point command.
|
| BASE POINT COMMAND | Specifying the coordinates of a base point for the pattern function.
|
| BASIC CONTROLLED AXES | Controlled axis having a name fixed by the CNC.
|
| BASIC COORDINATE SYSTEM | The basic coordinate system exists in parallel to the machine coordinate system when no transformation is active. The difference between the systems relates only to the axis identifiers.
|
| BASTARD | Threads, parts, tools, and sizes that are not
standard, such as ‘bastard nuts,’ “bastard plus,”
“bastard fittings,’ and so forth. The term also refers to
a standard coarse cut file.
|
| BATCH | A
number
of
items
being
dealt
with
as
a
group
|
| BATCH PROCESSING | A
manufacturing
operation
in
which
a
specified
quantity
of
material
is
subject
to
a
series
of
treatment
steps.
Also,
a
mode
of
computer
operations
in
which
each
programme
is
completed
before
the
next
is
started
|
| BAUD | A
unit
of
signalling
speed
equal
the
number
of
discrete
conditions
or
signal
events
per
second;
1
bit
per
second
in
a
train
of
binary
signals,
and
3
bits
per
second
in
an
octal
train
of
signals
|
| BEARING | Rollers, and balls placed between moving
parts to reduce friction and wear
|
| BED | One of the principal parts of a machine tool,
having accurately machined ways or bearing surfaces
for supporting and aligning other parts of the
machine.
|
| BEHIND THE TAPE READER | A
means
of
inputting
data
directly
into
a
macine
tool
control
unit
frcm
an
external
source
connected
behind
the
tape
reader
|
| BELL MOUTH | The flaring or tapering of a machined
hole, usually made at the entrance end because of
misalignment or spring of the cutting tool.
|
| BENCH GRINDER | A small grinding machine for
shaping and sharpening the cutting edges of tools
|
| BENCH LATHE | A small lathe mounted on a bench or
table.
|
| BENCH WORK | Work done primarily at a bench with
hand tools. occasionally supplemented by small
power-driven tools.
|
| BENCHMARK | A
standard
example
against
which
measurements
may
be
made
|
| BENDING COMPENSATION | Compensating the position of a hole for displacement due to the workpiece
being bent.
|
| BEVEL | Any surface that is not at right angles to
another surface. Also, the name given a tool used for
measuring, laying out, or checking the accuracy of
work machined at an angle or bevel.
|
| BILL OF MATERIALS | A
listing
of
all
the
parts
that
constitute
an
assembled product.
|
| BINARY | Is a number expressed in the base-2 numeral system or binary numeral system, a method of mathematical expression which uses only two symbols: typically "0" (zero) and "1" (one). The base-2 numeral system is a positional notation with a radix of 2.
|
| BINARY CODED DECIMAL (BCD) | A
number
code
in
which
individual
decimal
digits
are
each
represented
by
a
group
of
binary
digits;
in
the
8-4-2-1
BCD
notation,
each
decimal
digit
is
represented
by
a
four-place
binary
number,
weighted
in
sequence
as
8,
4,
2
and
1
|
| BINARY DIGIT (BIT) | A
character
used
to
represent
one
of
the
two
digits
in
the
binary
number
system,
and
the
basic
unit
of
information
or
data
storage
in
a
two-state
device
|
| BIT, TOOL (CUTTER) | A hardened steel bar or plate that
is shaped according to the operation to be performed
and the material to be machined.
|
| BLANK | The unmachined workpiece (Workpiece before machining)
|
| BLIND BOLE | A hole made in a workpiece that does not
pass through it.
|
| BLOCK | One of the command units constituting a program.
|
| BLOCK | A
set
of
words,
characters,
digits,
or
other
elements
handled
as
a unit. On
a
punched
tape,
it
consists
of
one
or
more
characters
or
rows
across
the
tape
that
collectively
provide
enough
information
for
an
operation. A word or group of words considered as a unit separated form other such units by an end of block character (EOB).
|
| BLOCK DELETE | Permits
selected
blocks
of
tape
to
be
ignored
by
the
control
system
at
discretion
of
the
operator
with
permission
of
the
programmer
|
| BLOCK DIAGRAM | A
chart
setting
forth
the
particular
sequence
of
operations
to
be
performed
for
handling
a
particular
application
|
| BLOCK FORMAT | The
arrangement
of
the
words,
characters
and
data
in
a
block
|
| BLOCK RESTART | Resuming automatic operation from the start, or an intermediate point, of a
block if automatic operation has been interrupted in that block due, for example,
to tool breakage.
|
| BLOCK SEARCH | Block search function can be used to select a point in the part program at which machining must be started or resumed.
|
| BLOCK, JO | Shop name for a Johannson gage block, a
very accurate measuring device.
|
| BLOWHOLE | A defect in a casting caused by trapped
steam or gas.
|
| BLUE VITRIOL COPPER SULFATE | A layout solution which
turns a copper color when applied to a clean. polished
metal surface.
|
| BLUEPRINT | A pen or ink line drawing reproduced
(printed) on sensitized paper by direct exposure
|
| BODE DIAGRAM | A
plot
of
log
amplitude
ratio
and
phase
angle
as
functions
of
log
frequency,
representing
a
transfer
function
|
| BOND | The material that holds the abrasive grains
together to form a grinding wheel.
|
| BOOLEAN ALGEBRA | In mathematics and mathematical logic, Boolean algebra is the branch of algebra in which the values of the variables are the truth values true and false, usually denoted 1 and 0, respectively. Instead of elementary algebra, where the values of the variables are numbers and the prime operations are addition and multiplication, the main operations of Boolean algebra are the conjunction (and) denoted as ∧, the disjunction (or) denoted as ∨, and the negation (not). It is thus a formalism for describing logical operations, in the same way that elementary algebra describes numerical operations.
|
| BOOTSTRAP | A
short
sequence
of
instructions,
which
when
entered
into
the
computers
programmable
memory
will
operate
a
device
to
load
the
programmable
memory
with
a larger, more sophisticated programme - usually a loader programme.
larger,
more
sophisticated
programme
|
| BORE | To enlarge and finish the surface of a
cylindrical hole by the action of a rotating boring bar
(cutting tool) or by the action of a stationary tool
pressed (fed) against the surface as the part is rotated.
|
| BORING BAR (CUFFER BAR) | A combination tool holder
and shank.
|
| BORING TOOL | A cutting tool in which the tool bit. the
boring bar and, in some cases, the tool holder are
incorporated in one solid piece
|
| BOSS | A projection or an enlarged section of a casting
through which a hole may be machined.
|
| BOX TOOL | A box tool is a tool holder that partially surrounds a work piece in an automatic lathe or screw machine, supporting it against the pressure of the cutting tool.
|
| BRASS | A nonferrous alloy consisting essentially of
copper and zinc.
|
| BRAZING | Joining metals by the fusion of nonferrous
alloys having a melting temperature above 800
degrees F, but below that of the metals being joined.
|
| BRINE | A saltwater solution for quenching or cooling
when heat treating steel.
|
| BRINELL HARDNESS | A method of testing the hardness
of a metal by controlled pressure of a hardened steel
ball of a given size
|
| BROACH | A long, tapered cutting tool with serration’s
which, when forced through a hole or across a
surface, cuts a desired shape or size
|
| BRONZE | A nonferrous alloy consisting essentially of
copper and tin.
|
| BUFF | To polish to a smooth finish of high luster with
a cloth or fabric wheel to which a compound has been
added.
|
| BUFFER STORAGE | 1.
A
place
for
storing
information
in
a
control
for
anticipated
transference
to
active
storage. It
enables
control
system
to
actimmediately
on
stored
information
without
waiting
on-
tape
reader. 2.
A register
used
for
intermediate
storage
for
information
in
the
transfer
sequence between
the
computers
accumulators
and
a
peripheral
device
|
| BUFFERING | Standby state set up before a command is executed.
|
| BUG | An
error
or
mistake.
|
| BULK MEMORY | A
high
capacity
auxiliary
data
storage
device
such
as
a
disc
or drum.
|
| BULL GEAR | The large crank gear of a shaper
|
| BURNISHING | The process of finishing a metal surface
by contact with another harder metal to improve it.
To make smooth or glossy by or as if by rubbing;
polish.
|
| BURR | The sharp edge left on metal after cutting or
punching, also, a rotary cutting tool designed to be
attached to a drill.
|
| BUS | A
conductor
used
for
transmitting
signals
or
power
between
elements.
|
| BUSHING | A sleeve or a lining for a bearing or a drill
jig to guard against wear.
|
| BYTE | A
sequence
of
adjacent
bits,
usually
less
that
a
word,
operated
on
as
a
unit.
|