HEIDENHAIN SW 54843x-03 DIN Programming - Manual (Page 505)

HEIDENHAIN MANUALplus 620, CNC PILOT 640 505
6.2 Cont
ours in the XY plane
Circular arc in XY plane G172-Geo/G173-Geo
G172/G173 defines a circular arc in a contour of the XY plane. Direction
of rotation: See help graphic
Parameters
X
End point (radius)
Y End point
R Radius
I Center in X direction (radius)
J Center in Y direction
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: Radius of rounding
 BR<0: Width of chamfer
PZ End point (polar radius; reference: workpiece zero point)
W End point (polar angle; reference: workpiece zero point)
PM Center point (polar radius; reference: workpiece zero point)
WM Center point (polar angle; reference: workpiece zero point)
AR
Starting angle (tangential angle to rotary axis)
AN End angle (tangential angle to rotary axis)
Programming
 X, Y: Absolute, incremental, modal or "?"
 I, J: Absolute or incremental
 PZ, W, PM, WM: Absolute or incremental
 ARi: Angle to the previous element
 ANi: Angle to the subsequent element
 End point must not be the starting point (no full circle).