HEIDENHAIN TNC 407 (280 580) ISO Programming - Manual (Page 150)

5 - 1 7 TNC 426/TNC 425/TNC 415 B/TNC 407
5 Programming Tool Movements
Fig. 5.24: Incremental coordinates for a circle center
5.4 Path Contours – Cartesian Coordinates
Entering I, J, K incrementally
If you enter the circle center with incremental
coordinates, you have programmed it relative to the
last programmed position of the tool.
• The circle center I, J, K also serves as the pole for polar coordinates.
• The only effect of I, J, K is to define a position as a circle center — the tool does not move to the position.
To program a circle center (pole):
Select the first circle center designation, for example I.
Enter the coordinate, for example I = 20 mm.
Select the second circle center designation, for example J.
Enter the coordinate, for example J = –10 mm.
Resulting NC block: I+20 J–10 *
Y
X
G91 J
G91 I
END
1 0
+/
J
I
2 0