CNC Machine G-Code Tutorial – List Of G-Codes For CNC Programming | CNCLATHING

G00 – Rapid positioning

Format: G00 x (U)__ Z(W)__

Explain:

(1) The command makes the tool move to the designated position quickly according to the point control mode. The workpiece shall not be machined during moving.

(2) All programming axes move at the speed defined by the parameters at the same time. When one axis finishes the programming value, it stops, while other axes continue to move. If you want to learn UG programming, you can get learning materials in QQ group 1006319362.

(3) There is no need to program the coordinates that do not move.

(4) G00 can be written as G0.

G01 – Linear interpolation

Format: G01 x (U)__ Z(W)__ F__ (mm/min)

Explain:

(1) The command makes the tool move to the specified position according to the linear interpolation mode. The moving speed is the feed speed instructed by F. All coordinates can be linked.

(2) G01 can also be written as G1.

Example: G01 X40 z20 F150, two axis linkage from point a to point B

G02 – Circular interpolation clockwise

Format 1: G02X(u)____ Z(w)____ I____ K____ F_____

Explain:

(1) When x and Z are at G90, the coordinates of arc end point are absolute coordinates relative to the programming zero point. In G91, the end point of the arc is the increment value relative to the start point of the arc. Regardless of G90 and G91, I and K are the incremental coordinates of the center of the arc relative to the starting point. I is the value in X direction and K is the value in Z direction. The coordinates of the center of a circle should not be omitted in circular interpolation, unless it is programmed in other formats.

(2) G02 instruction programming, you can directly over the quadrant circle, round and so on.

(3) G02 can also be written as G2.

Example: G02 X60 Z50 i40 K0 F120

Format 2: g02x (U)____ Z(w)____ R（+－）__ F__

Explain:

(1) It can’t be used to program the whole circle

(2) R is the radius of one side r arc of the workpiece. R is signed, “+” means that the arc angle is less than 180 degrees; “-” means that the arc angle is greater than 180 degrees. Where “+” can be omitted.

(3) When the length between the end point and the starting point is greater than 2R, the arc is replaced by a straight line.

G04 – Dwell

Format: G04__ F__ Or G04__ K__

Explain: The processing motion is suspended, and the processing will continue when the time is up. The pause time is specified by the data after F. The unit is seconds. The range is 0.01 seconds to 300 seconds. 

G05 – Middle point arc interpolation

Format: g05x (U)____ Z(w)____ IX_____ IZ_____ F_____

Explain:

(1) x and Z are the coordinates of the end point, IX and iz are the coordinates of the middle point. Others are similar to G02 / G03.

Example: G05 X60 Z50 ix50 iz60 F120

G08 – Acceleration / deceleration

Format: G08

Explain:

They occupy a single line in the program segment. When the program runs to this segment, the feed speed will increase by 10%. If it needs to increase by 20%, it needs to be written as two separate segments.

G22 – Radius programming

Format: G22

Explain:

If you occupy a single line in the program, the system will run in the way of radius, and the following values in the program are also based on the radius.

G23 (G230) – Diameter dimension programming mode

Format: G23

Explain:

If you occupy a single line in the program, the system runs in diameter mode, and the following values in the program are also based on the diameter.

G25 – Jump processing

Format: G25 LXXX

Explain:

When the program is executed to this section of the program, it will transfer the specified section. (XXX is the program segment number).

G26 – Cycle processing

Format: g26 LXXX QXX

Explain:

When the program is executed to this section of the program, it specifies that the program section starts to this section as a loop body, and the number of cycles is determined by the value after Q.

G30 – Rate cancellation

Format: G30

Explain:

In the program alone occupy a line, with G31 use, cancel G31 function.

G31/32/33 – Definition of magnification

Format: G31 F_____

G32 – equal pitch thread processing (English system)

G33 – equal pitch thread processing (metric system)

Format: G32 / G33 x (U)____ Z(w)____ F____

Explain:

(1) X and Z are the coordinates of the end point, and F is the pitch

(2) G33 / G32 can only process single tool and single thread.

(3) With the change of x value, the taper thread can be machined

(4) When using the command, the spindle speed should not be too high, otherwise the tool wear is large.

G74 – Return to reference point

Format: G74 x Z

Explain:

(1) The coordinates appearing after G74 will return to zero by X and Z in turn.

(2) Before using G74, it must be confirmed that the machine tool is equipped with reference point switch.

(3) Single axis zero return can also be performed.

G81 outer circle (inner circle) fixed cycle

Format: g81__ X(U)__ Z(W)__ R__ I__ K__ F__

Explain:

(1) X and Z are the coordinate values of the end point, u and W are the increment values of the end point relative to the current point.

(2) R is the diameter of the starting section to be machined.

(3) I is rough turning feed, K is finish turning feed, I and K are signed numbers, and their symbols should be the same. The symbol convention is as follows: cutting from the outer central axis (turning the outer circle) is “-“, and vice versa is “+”.

(4) Different x, Z and R determine different switches of the outer circle, such as taper or no taper, forward taper or reverse taper, left cutting or right cutting, etc.

(5) F is the cutting speed (mm / min).

(6) After machining, the tool stops at the end point.