184 ISO Programming
4.3 Basic Contour Elements
Circular arc of turning contour G12/G13-Geo
G12/G13 defines a circular arc in a contour with absolute center
dimensioning. Direction of rotation (see help graphic):
G12: In clockwise direction
G13: In counterclockwise direction
Example: G12-, G13-Geo
Parameters
X Final point of contour element (diameter value)
Z Final point of contour element
I Center (radius dimension)
KCenter
R Radius
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, BF, BD, BP and BH (see “Machining attributes for form
elements” on page 181)
Programming X, Z: Absolute, incremental, modal or “?”
. . .
FINISHED
N1 G0 X0 Z-10
. . .
N7 G13 Xi-15 Zi15 R20
Target point (incremental) and radius
N8 G12 X? Z? R15
Only the radius is known
N9 G13 X25 Z-30 R30 BR10 Q1
Rounding arc in transition and selection of
intersections
N10 G13 X5 Z-10 I22.3325 K-12.584
Target point and center, absolute
. . .
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