HEIDENHAIN TNC 620 (73498x-01) ISO programming - Manual (Page 188)

188 Programming: Programming contours
6.5 P
a
th cont
ours—P
olar coor
dinat
e
s
Circular path G12/G13/G15 around pole I, J
The polar coordinate radius R is also the radius of the arc. R is defined
by the distance from the starting point to the pole I, J. The last
programmed tool position will be the starting point of the arc.
Direction of rotation
„ In clockwise direction: G12
„ In counterclockwise direction: G13
„ Without programmed direction: G15. The TNC traverses the circular
arc with the last programmed direction of rotation
U Polar-coordinates angle H : Angular position of the
arc end point between –99 999.9999° and
+99 999.9999°
U Direction of rotation DR
Example NC blocks
Circular path G16 with tangential connection
The tool moves on a circular path, starting tangentially from a
preceding contour element.
U Polar coordinate radius R : Enter the distance from
are end point to the pole I, J
U Polar coordinates angle H : Angular position of the
arc end point
Example NC blocks
X
Y
25
25
R20
CC
N180 I+25 J+25 *
N190 G11 G42 R+20 H+0 F250 M3 *
N200 G13 H+180 *
X
Y
40
35
CC
30°
120°
R30 R25
N120 I+40 J+35 *
N130 G01 G42 X+0 Y+35 F250 M3 *
N140 G11 R+25 H+120 *
N150 G16 R+30 H+30 *
N160 G01 Y+0 *
The pole is not the center of the contour arc!