Operation Manual

HEIDENHAIN CNC PILOT 4290 191
4.13 Simple Linear and Circular Movements
Circular path G12/ G13
G12/G13 moves the tool in a circular arc at the feed rate to the “end
point.” The center dimensioning is absolute. Direction of rotation (see
help graphic):
 G12: In clockwise direction
 G13: In counterclockwise direction
Parameters
X End point (diameter)
Z End point
R Radius (0 < R <= 200 000 mm)
I Absolute center point (radius)
K Absolute center point
Q Point of intersection. End point if the circular arc intersects a
line segment or another circular arc (default: 0):
 Q=0: Near point of intersection
 Q=1: Far point of intersection
B Chamfer/rounding. Defines the transition to the next contour
element. When entering a chamfer/rounding, program the
theoretical end point.
 No entry: Tangential transition
 B=0: No tangential transition
 B>0: Rounding radius
 B<0: Chamfer width
E Special feed factor for chamfer/rounding arc (default: 1)
Special feed rate = active feed rate * E (0 < E <= 1)
Programming X, Z: Absolute, incremental, modal or “?”
Danger of collision!
If V variables are used for calculating the address
parameters, a limited contour check is carried out. Ensure
that the variable values produce a circular arc.