Gcode and commands

G codes

Codes and commands ››

The following tables will give a brief explanation to the various G, M and other codes recognized by the CNCSimulator interpreter. In the Format column, you will see the format expected by the program. If a code is written within brackets like this [X#] it means that the code is non obligatory and can be omitted if not needed. The # sign means that the CNCSimulator expects a number and the $ sign means that it is expecting a text string within quotation marks.

Let's show an example:

G12[X#][Y#]Z#R#Q#S#SA#AS#RA#H#

This means that the code G12 accepts X and Y coordinates but they are not obligatory and can be omitted. On the other hand, you must specify the Z,R,Q,S,SA,AS,RA and H codes to avoid an alarm at runtime.

G-code (codes valid from V1.0.6.5)	Explanation	Format	Example	Machine type
G0 or G00	Go rapidly (with maximum traverse rate) to the X/Y/Z position. This code is used for position and not for actual machining.	G0 [X#][Y#][Z#]	G0 Z100	All machines
G1 or G01	Travel in a straight line using the programmed feed rate (F). This code is used for machining.	G1 [X#][Y#][Z#][F#]	G1 X2.5 Y4.1 F200	All machines
G2 or G02 XY-machines Lathe	Circular/Helical Interpolation clockwise. It causes a clockwise circular movement at programmed feed rate (F). The motion can be 2-dimensional (flat) or 3-dimensional (helical). The default plane of the circular movement is the XY-plane (G17) but other planes can be used as well (see G17-G19). The center of the arc or circle is programmed using the I, J and K letters (R can also be used).	G2[X#][Y#][Z#] [I#][J#][K#][R#][F#]	G2 X10 Y10 I10 J0 F200	All machines
G3 or G03 XY-machines Lathe	Exactly like G2 but the circular motion is going counterclockwise.	G3[X#][Y#][Z#] [I#][J#][K#][R#][F#]	G3 X10 Y10 I10 J0 F200	All machines
G4	Dwell in milliseconds. This will keep the axes unmoving for the period of timed specified by the P number.	G4 P#	G4 P2000 (Two seconds delay)	All machines
G12	Circular drilling canned cycle. Use to drill holes around the contour of a circle. R is starting plane and Z is total drill depth for each hole. Q is incremental depth (peck). SA is circle start angle (angle of first hole too) and AS is angle between holes. RA is circle radius and H specifies the number of holes to drill.	G12[X#][Y#]Z# R#Q#S#SA# AS#RA#H#	G12 X0 Y0 Z-20 R2 Q5 SA0 AS36 RA30 H10	Milling machines only
G17	Selects the XY plane for circular movements (see G2 and G3).	G17	G17	Milling machines only
G18	Selects the XZ plane for circular movements (see G2 and G3)	G18	G18	Milling machines only
G19	Selects the YZ plane for circular movements (see G2 and G3)	G19	G19	Milling machines only
G28	Return home command. This command will first go to the programmed position X/Y/Z and then to the Xmin Ymax Zmax of the machine axes. It can be a convenient way to end a program putting the machine table in a position to change workpiece.	G28[X#][Y#][Z#]	G28 Z10	Milling and turning machines only
G40	Cancel cutter compensation previously activated by G41 or G42.	G40	G40	All machines except the 3D Printer
G41	Activates left side cutter compensation (or nose radius compensation in a lathe).	G41	G41	All machines except the 3D Printer
G42	Activates right side cutter compensation (or nose radius compensation in a lathe).	G42	G42	All machines except the 3D Printer
G54-G59	Fixture (work) offsets. A typical use of these G-codes is to establish a local coordinate system for each workpiece when using multiple ones. You need to setup the offsets in the Zero Points Data table in the Inventory Browser (F2). G54 corresponds to offset registry index 0, G55 to index number 1 etc…	G54	G0 G54 X0 Y0 Z3	All machines
G54.1	Fixture (work) offsets. A typical use of these G-codes is to establish a local coordinate system for each workpiece when using multiple ones. You need to setup the offsets in the Zero Points Data table in the Inventory Browser (F2). G54.1 uses letter P to specify the offset registry index.	G54.1 P# (0-99)	G54.1 P10 (Use work offset 10)	All machines
G73	Peck drilling canned cycle. The cycle is intended for deep drilling or chip breaking milling operations. The cycle retracts the tool to break chips. Code letter Q is used for peck size. R is starting plane and Z is total depth. Parameter P is used for dwell at each peck. Please note that at the end of the cycle, the return position in Z is controlled by G98 and G99.	G73 [X#][Y#][Z#] [R#][Q#][P#]	G73 Z-20 R1 Q1 P100	Milling and turning machines only
G74-G76	Generic drilling/boring/tapping canned cycle. These are used in a generic way to create compatibility with many common CNC controllers on the market. They will bring the tool to the programmed Z depth. If R is programmed it will be used as the start plane, if not the current Z position will be used as the start plane. All other parameters will be ignored.	G74 [X#][Y#][Z#][R#]	G74 Z-20 R1	Milling and turning machines only
G80	Cancels any canned cycle. Please note that G0 – G3 also cancels canned cycles.	G80	G80	Milling and turning machines only
G81	Basic drilling canned cycle. R is starting plane and Z is total depth. Please note that at the end of the cycle, the return position in Z is controlled by G98 and G99.	G81 [X#][Y#][Z#][R#]	G81 Z-6 R2	Milling and turning machines only
G82-G89	Generic drilling/boring/tapping canned cycle. Same as G74-G76 above.	G82 [X#][Y#][Z#][R#]	G82 Z-20 R1	Milling and turning machines only
G90	Absolute programming mode. Distances given will move the tool relative to an absolute zero.	G90	G90 G0 X10 Y10	All machines
G91	Incremental programming mode. Distances given will move the tool relative to the current position of the tool.	G91	G91 G0 Z5	All machines
G92	Use to reposition the origin point (zero point).	G92[X#][Y#][Z#]	G92 X20 Y20 Z10	All machines
G98	Initial level return at the end of a canned cycle.	G98	G81 G98  Z-7 R2	Milling and turning machines only
G99	R level return at the end of a canned cycle.	G99	G81 G99  Z-7 R2	Milling and turning machines only

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