HEIDENHAIN iTNC 530 (60642x-04) ISO programming - Manual (Page 234)

234 Programming: Programming Contours
6.5
Pa
th
cont
ours—P
olar
coor
dinat
es
Zero point for polar coordinates: pole I, J
You can define the pole CC anywhere in the part program before
blocks containing polar coordinates. Set the pole in the same way as
you would program the circle center.
 Coordinates : Enter Cartesian coordinates for the pole
or, if you want to use the last programmed position,
enter G29. Before programming polar coordinates,
define the pole. You can only define the pole in
Cartesian coordinates. The pole remains in effect until
you define a new pole.
Example NC blocks
Straight line at rapid traverse G10
Straight line with feed rate G11 F
The tool moves in a straight line from its current position to the
straight-line end point. The starting point is the end point of the
preceding block.
 Polar-coordinates radius R : Enter the distance from
the pole CC to the straight-line end point.
 Polar-coordinates angle H : Angular position of the
straight-line end point between –360° and +360°
The sign of H depends on the angle reference axis:
 If the angle from the angle reference axis to R is counterclockwise:
H
>0
 If the angle from the angle reference axis to R is clockwise: H<0
Example NC blocks
X
Y
X=I
Y=J
N120 I+45 J+45 *
X
Y
45
25
60°
60°
30
CC
N120 I+45 J+45 *
N130 G11 G42 R+30 H+0 F300 M3 *
N140 H+60 *
N150 G91 H+60 *
N160 G90 H+180 *
11