Cnc Fanuc Code Words

Front 1

O

Back 1

This word is used to designate programs in the control's memory. O0001 through O9999 can be used. The program number is always the very first word of the CNC program. No decimal point is allowed with this word.

Front 2

N

Back 2

This word designates a sequence number (also called a blocknumber). It is used for line identification only and does not have to be in the CNC program at all. To keep programs organized beginners should include sequence numbers and place them in a logical order. N0001 (or N1) through N9999 can be used. No decimal point is allowed with this word.

Front 3

G

Back 3

This word specifies a preparatory function. Preparatory functions prepare the control for what is coming in the current command or future commands (many G codes are modal). Though there are a few exceptions G codes commonly range from g00 through g99 and normally do not include a decimal point.

Front 4

X

Back 4

This word designates a positioning movement along the X axis. In the inch mode a the smallest increment of programming is 0.0001 inch. Though a fixed format will be used if a decimal point is not specified in this word (X10000 will be taken as 1 inch in the inch mode or 10 mm in the metric mode) beginners should get into the habit of specifying this word with a decimal point. Secondary use X is used with hole machining canned cycles to specify the hole center position X.

Front 5

Y

Back 5

This word designates a positioning movement along the Y axis. In the inch mode a the smallest increment of programming is 0.0001 inch. Though a fixed format will be used if a decimal point is not specified in this word (Y10000 will be taken as 1 inch in the inch mode or 10 mm in the metric mode) beginners should get into the habit of specifying this word with a decimal point. Secondary use Y is used with hole machining canned cycles to specify the hole center position Y.

Front 6

Z

Back 6

This word designates a positioning movement along the Z axis. In the inch mode a the smallest increment of programming is 0.0001 inch. Though a fixed format will be used if a decimal point is not specified in this word (Z10000 will be taken as 1 inch in the inch mode or 10 mm in the metric mode) beginners should get into the habit of specifying this word with a decimal point. Secondary use Z is used with hole machining canned cycles to specify the hole center position Z.

Front 7

A B C

Back 7

For machining centers that have rotary axes these words are used to specify positioning along the rotary axis. The smallest increment of programming is 0.001 degree. As with X Y and Z beginners should program these wprds with a decimal point. A position of 45 degrees is specified as A45. (or B45.) Secondary use: For machines with one degree indexers these words are also used. Note that with a one degree indexer no decimal point is allowed (A30 specifiesa 30 degree index).

Front 8

R

Back 8

Used to designate the radius of a circular movement/ Secondary use: Used with hole machining canned cycles to designate the rapid plane.

Front 9

I J K

Back 9

Can be used to designate the center of radius being formed with circular commands but beginners should concentrate on using the R word. These words specify the distance and direction from the start point to the center of the arc in X Y and Z respectively.

Front 10

F

Back 10

Used to designate feedrate. Most machining centers are programmed exclusively in per minute designation meaning a feedrate of 10 inches per minute is specified as F10.0.

Front 11

S

Back 11

Used to designate spindle speed and rpm. No decimal part is allowed with the word. S500 specifies 500 rpm.

Front 12

T

Back 12

For machines having double arm tool changers T specifies the tool to be placed in the waiting position (not in the spindle). It is commonly a two digit word not allowing a decimal point. T04 places tool station number four in the waiting position.

Front 13

M

Back 13

This word specifies one of a series of two digit miscellaneous functions. No decimal point is allowed with this word.

Front 14

D

Back 14

A two digit integer word D specifies the offset number to be used with cutter radius compensation.

Front 15

H

Back 15

A two digit integer word H specifies the offset number to be used with tool length compensation.

Front 16

P

Back 16

P specifies the program number to call with subprogramming techniques. No decimal point is allowed with P. Secondary uses: P can also be used to specify the length of time in a dwell command.

Front 17

Q

Back 17

Specifies the depth of peck for peck drilling cycles G73 and G83.

Front 18

/

Back 18

Optional block skip word (also called block delete). When programmed at the beginning of a command this word causes the control to lookat an on/off switch on the control panel. If the switch is on the command is skipped.