HEIDENHAIN TNC 360 ISO Programming - Manual (Page 100)

5-17 TNC 360
5 Programming Tool Movements
Fig. 5.22: Incremental circle center coordinates
5.4 Path Contours - Cartesian Coordinates
Y
X
G91 J
G91 I
1 e.g. 0
e.g.
e.g. J
I
2
e.g.
0
+/
END
Entering I, J, K in relative values
If you enter the circle center with relative coordi-
nates, you have defined it relative to the last
programmed tool position.
• The circle center I, J, K also serves as pole for polar coordinates.
• I, J, K defines a position as a circle center. The resulting contour is located on the circle, not on the circle
center.
To program a circle center (pole):
Select the coordinate axis for the circle center.
Enter the coordinate for the circle center on this axis, for example
I = 20 mm.
Select the second coordinate axis, for example J.
Enter the coordinate of the circle center, for example J = –10 mm.
Resulting NC block: I+20 J–10 *