228 ISO Programming
4.10 Linear and Circular Movements
Circular arc G2/ G3
G2/G3 moves the tool in a circular arc at the feed rate to the “end
point.” The center dimensioning is incremental. Direction of rotation
(see help graphic):
G2: In clockwise direction
G3: In counterclockwise direction
Example: G2, G3
N1 T3 G95 F0.25 G96 S200 M3
N2 G0 X0 Z2
N3 G42
N4 G1 Z0
N5 G1 X15 B-0.5 E0.05
N6 G1 Z-25 B0
N7 G2 X45 Z-32 R36 B2
N8 G1 A0
N9 G2 X80 Z-80 R20 B5
N10 G1 Z-95 B0
N11 G3 X80 Z-135 R40 B0
N12 G1 Z-140
N13 G1 X82 G40
. . .
Parameters
X Final point (diameter)
Z Final point
R Radius (0 < R <= 200 000 mm)
I Incremental center point (distance from starting point to
center point; radius)
K Incremental center point (distance from starting point to
center)
Q Point of intersection. End point if the circular arc intersects a
line segment or another circular arc (default: 0):
0: Near point of intersection
1: Far point of intersection
BR Chamfer/rounding. Defines the transition to the next contour
element. When entering a chamfer/rounding, program the
theoretical end point.
No entry: Tangential transition
BR=0: No tangential transition
BR>0: Rounding radius
BR<0: Width of chamfer
BE Special feed factor for chamfer/rounding arc (default: 1)
Special feed rate = active feed rate * BE (0 < BE <= 1)
Programming X, Z: Absolute, incremental, modal or “?”
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