G02 - Clockwise Arc Feed Move

Clockwise Arc Feed Move.

G02 is used to move the CNC machine along an arc. It is used to perform circular interpolation clockwise. The G02 command is typically used in conjunction with the X, Y, and Z axis commands to specify the end point of the arc, as well as the I, J, and K words to specify the center point of the arc. The F command can also be used to set the feed rate for the motion.

For example, G02 X10 Y5 Z0 I0 J0 K1 F100 would move the tool in a clockwise arc, with the center of the arc at coordinates (0,0), ending at coordinates (10,5), at a feed rate of 100 units per minute.

G03 is the counterpart of G02 command, it is used to move the CNC around along an arc counter-clockwise.

Arc can be in 3 different planes, depending of G17, G18 or G19 modal state.

• XY plane, G17 state, Z rotation axis
• ZX plane, G18 state, Y rotation axis
• YZ plane, G19 state, X rotation axis

If motion in direction of rotation axis is specified then helical motion is generated.

Arc is specified in center format using IJK words or in radius format using R word.

Center format – arc center is defined with IJ (in XY plane), KI (in ZX plane) or JK (in YZ plane) words.
In incremental arc distance mode (G91.1) arc center is set as offset from start position.
In absolute arc distance mode (G90.1) arc center is set as distance from zero position.

Radius format – arc is defined with arc radius. This format is depreciated because it can in certain conditions produce cuts that are out of tolerances.

Number of rotations can be set with optional P word. If, for example, P3 is set then we have two full circles before final arc.

G02 <X..W @^> <IJK> <P>
G02 <X..W @^> <R> <P>

%
G21 G90 G91.1 G8
G17
G00 X0 Y0 Z0
G00 X30
G02 Z60 I-30 J0 P2
G02 Z120 I-30 J0 P2
G02 X-30 Z165 I-30 J0 P2
G01 X30 Y120 Z180
G03 Z120 I-30 J0 P2
G03 Z60 I-30 J0 P2
G03 Z0 I-30 J0 P2
 
G19
G00 X30 Y120 Z0
G03 X90 J0 K30 P2
G03 X150 J0 K30 P2
G03 X165 Y90 Z30 J0 K30
 
G18
G00 X165 Y90 Z30
G02 Y30 Z30 K0 I30 P2
 
G19
G00 X165 Y30 Z30
G02 X97.5 J-30 K0 P2
G02 X37.5 J-30 K0 P2
%

G01, G03