A to Z Letter address used on CNC Machining
Letter Address
|
Description
|
Refers to
|
A
|
Angular
Value about the X-axis. Measured in degrees
|
Axis
nomenclature
|
B
|
Angular
Value about the Y-axis. Measured in degrees
|
Axis
nomenclature
|
C
|
Angular
Value about the Z-axis. Measured in degrees
|
Axis
nomenclature
|
D
|
the tool diameter or radius used for cutter
compensation
|
Cutter compensation Parameter
|
E
|
second feed function
|
accuracy required when cutting a corner
|
F
|
Feed word (code)
|
Feed words
|
G
|
Preparatory word (code)
|
G-code Words
|
H
|
Unassigned/specifying for tool height
compensation
|
|
I
|
Interpolation parameter or thread lead
parallel to the X-axis
|
Circular interpolation and threading
|
J
|
Interpolation parameter or thread lead parallel
to the Y-axis
|
Circular interpolation and threading
|
K
|
Interpolation parameter or thread lead
parallel to the Z-axis
|
Circular interpolation and threading
|
L
|
Unassigned
|
|
M
|
Miscellaneous or auxilliary function
|
Machine Control Codes
|
N
|
Sequence number
|
Program Line numbers
|
O
|
Sequence
number for secondary head only
|
Indicates Program Number
|
P
|
P address character is used for a dwell time
|
Delay of time
|
Q
|
character is used in canned cycles
|
Depth specification
|
R
|
used in canned cycles or circular interpolation
|
Axis
nomenclature
|
S
|
Spindle-speed function
|
Spindle
speed
|
T
|
Tool Change function
|
Tool
function
|
U
|
Secondary-motion dimension parallel to X
|
Axis
nomenclature
|
V
|
Secondary-motion dimension parallel to Y
|
Axis nomenclature
|
W
|
Secondary-motion dimension parallel to Z
|
Axis nomenclature
|
X
|
Dimension of Tool movement in X direction
|
Axis nomenclature
|
Y
|
Dimension of Tool movement in Y direction
|
Axis nomenclature
|
Z
|
Dimension of Tool movement in Z direction
|
Axis nomenclature
|
ALPHABETICAL ADDRESS CODES
The following is a list of the Address Codes used
in programming the Mill.
A - FOURTH AXIS ROTARY MOTION:
The A address character is used to specify motion
for the optional fourth, A- axis, which is angular value about X-axis. It
specifies an angle in degrees for the rotary axis. It is always followed by a
signed number and up to three fractional decimal positions. If no decimal point
is entered, the last digit is assumed to be 1/1000 degrees.
B - FIFTH AXIS ROTARY MOTION:
The B address character is used to specify motion
for the optional fifth, B, axis, which is angular value about Y-axis. It
specifies an angle in degrees or the rotary axis. It is always followed by a
signed number and up to three fractional decimal positions. If no decimal point
is entered, the last digit is assumed to be 1/1000 degrees.
C - AUXILIARY EXTERNAL ROTARY AXIS:
The C address character is used to specify motion
for the optional external sixth, C, axis, which is angular value about Z-axis
It, specifies an angle in degrees for the rotary axis. It is always followed by
a signed number and up to three fractional decimal positions. If no decimal
point is entered, the last digit is assumed to be 1/1000 degrees.
D - TOOL DIAMETER OFFSET SELECTION:
The D address character is used to select the tool
diameter or radius used for cutter compensation. The number following must be
between 0 and 200 (100 programs on an older machine). The Dnn selects that
number offset register that is in the offset display which contains the tool
diameter/radius offset amount when using cutter compensation (G41 G42). D00
will cancel cutter compensation so that the tool size is zero and it will cancel
any previously defined Dnn.
E - ENGRAVING FEED RATE / CONTOURING ACCURACY:
The E address character is used, with G187, to
select the accuracy required when cutting a corner during high speed machining
operations. The range of values possible is 0.0001 to 0.25 for the E code.
F - FEED RATE:
The F address character is used to select the feed
rate. It is either in inches per minute with four fractional positions or mm
per minute with three fractional positions.
G - PREPARATORY FUNCTIONS (G codes):
The G address character is used to specify the type
of operation to occur by the tool in the block containing the G code. The G is
followed by a two or three digit number between 0 and 187. Each G code defined
in this control is part of a group of G codes.
H - TOOL LENGTH OFFSET SELECTION:
The H address character is used to select the tool
length offset entry from the offsets memory. The H is followed by a two digit
number between 0 and 200 (100 programs on an older machine). H0 will clear any
tool length offset. You must select either G43 or G44 to activate a tool length
(H) offsets. The G49 command is the default condition and this command will
clear any tool length offsets.
I - CIRCULAR INTERPOLATION / CANNED CYCLE DATA:
The “I” address character is used to specify
Interpolation parameter or thread lead parallel to the X-axis. It is defined in
inches with four fractional positions or mm with three fractional positions.
J - CIRCULAR INTERPOLATION / CANNED CYCLE DATA:
The J address character is used to specify Interpolation
parameter or thread lead parallel to the Y-axis. It is defined in inches with
four fractional positions or mm with three fractional positions.
K - CIRCULAR INTERPOLATION / CANNED CYCLE DATA:
The K address character is used to specify
Interpolation parameter or thread lead parallel to the Z-axis. It is defined in
inches with four fractional positions or mm with three fractional positions.
L - LOOP COUNTS TO
REPEAT A COMMAND LINE:
The L address character is used to specify a repeat
count for some canned cycles and auxiliary functions. It is followed by a
number between 0 and 32767.
M - M-CODE MISCELLANEOUS FUNCTIONS:
The M address character is used to specify an M
code. These codes are used to control miscellaneous machine functions.
N - NUMBER OF BLOCK:
The N address character is used to identify or
number each block of a program. It is followed by a number between 0 and 99999.
O - PROGRAM NUMBER:
The O address character is used to identify a
program. It is followed by a number between 0 and 99999. You can have up to 500
program numbers (200 programs on an older machine) in your List of Programs.
P - DELAY OF TIME / M98 PROGRAM NUMBER Call:
The P address character is used for either a dwell
time in seconds with a G04, or in canned cycles G82, G83, G86, G88, G89 and
G73. When used as a dwell time, it is defined as a positive decimal value
between 0.001 and 1000.0 in seconds. When ‘P” is used to search for a program
number with an M98, or for a program number block in an M97. When P is used in
a M97 or M98 the P value is a positive number with no decimal point up to
99999.
Q - CANNED CYCLE OPTIONAL DATA:
The Q address character is used in canned cycles
and is always a positive number in inches between 0.001 and 100.0.
R - CIRCULAR INTERPOLATION / CANNED CYCLE DATA:
The R address character is used in canned cycles or
circular interpolation. It's either in inches with four fractional positions or
mm with three fractional positions. It is followed by number in inches or
metric. It's usually used to define the reference plane for canned cycles.
S - SPINDLE SPEED COMMAND:
The S address character is used to specify the
spindle speed; The S is followed by an unsigned number between 1 - 99999. The S
command sets the desired speed.
T - TOOL SELECTION CODE:
The T address character is used to select the tool
for the next tool change. The number following must be a positive number
between 1 and (20) the number in Parameter 65.
U - AUXILIARY EXTERNAL LINEAR AXIS:
The U address character is used to specify motion
for the optional external linear, U-axis.
It specifies a position of motion in inches. It is
always followed by a signed number and up to four fractional decimal positions.
If no decimal point is entered, the last digit is assumed to be 1/10000 inches.
The smallest magnitude is 0.0001 inches, the most negative value is -8380.0000
inches, and the largest number is 8380.0000 inches.
V - AUXILIARY EXTERNAL LINEAR AXIS:
The V address character is used to specify motion
for the optional external linear, V-axis.
It specifies a position of motion in inches. It is
always followed by a signed number and up to four fractional decimal positions.
If no decimal point is entered, the last digit is assumed to be 1/10000 inches.
W - AUXILIARY EXTERNAL LINEAR AXIS:
The W address character is used to specify motion
for the optional external linear, W-axis.
It specifies a position of motion in inches. It is
always followed by a signed number and up to four fractional decimal positions.
If no decimal point is entered, the last digit is assumed to be 1/10000 inches.
X - LINEAR X-AXIS MOTION:
The X address character is used to specify motion
for the X-axis. It specifies a position or distance along the X-axis. It is
either in inches with four fractional positions or mm with three fractional
positions. It is followed by a signed number in inches or metric. If no decimal
point is entered, the last digit is assumed to be 1/10000 inches or 1/1000 mm.
Y - LINEAR Y-AXIS MOTION:
The Y address character is used to specify motion
for the Y-axis. It specifies a position or distance along the Y-axis. It is
either in inches with four fractional positions or mm with three fractional
positions. It is followed by a signed number in inches or metric. If no decimal
point is entered, the last digit is assumed to be 1/10000 inches or 1/1000 mm.
Z - LINEAR Z-AXIS MOTION:
The Z address character is used to specify motion
for the Z-axis. It specifies a position or distance along the Z-axis. It is
either in inches with four fractional positions or mm with three fractional positions.
It is followed by a signed number in inches or metric. If no decimal point is
entered, the last digit is assumed to be 1/10000 inches or 1/1000 mm.
