User's Manual ISO TNC 360 (260020xx, 280490xx) - heidenhain

5 Programming Tool Movements
5.4 Path Contours - Cartesian Coordinates
TNC 360
Entering I, J, K in relative values
If you enter the circle center with relative coordinates,
you have defined it relative to the last
programmed tool position.
e.g.
I
e.g. 2 0
e.g. J
e.g. 1 0
END
+/
Y
G91 J
G91 I
Fig. 5.22: Incremental circle center coordinates
• 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):
Resulting NC block: I+20 J–10 *
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.
X
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