HEIDENHAIN TNC 407 (280 580) ISO Programming - Manual (Page 161)

TNC 426/TNC 425/TNC 415 B/TNC 407 5 - 2 8
5 Programming Tool Movements
G 1 0
R 5
3 H 0 END
X
Y
H
R
J
I
G91 H
G91 H
G91 H
G91 H
X
Y
Pol
J
I
Fig. 5.37: Contour consisting of straight
lines with polar coordinates
Fig. 5.36: The pole is the same as a circle
center
5.5 Path Contours – Polar Coordinates
Polar coordinates are useful with:
• Positions on circular arcs
• Workpiece drawing dimensions in degrees
Polar coordinates are explained in detail in the
section “Fundamentals of NC” (page 1-12).
Polar coordinate origin: Pole I, J, K
The pole can be defined anywhere in the program before blocks
containing polar coordinates. Similar to a circle center, the pole is defined
in an I, J, K block using its coordinates in the Cartesian coordinate
system. The pole remains in effect until a new pole is defined. The
designation of the pole depends on the working plane:
Working plane Pole
X Y I, J
Y Z J, K
Z X K, J
G10: Straight line with rapid traverse
G11: Straight line with feed rate F …
• Values from –360° to +360° are permissible for the angle H
• The sign of H depends on the angle reference axis:
Angle from angle reference axis to R is counterclockwise: H>0
Angle from angle reference axis to R is clockwise: H<0
Straight line in polar coordinates with rapid traverse.
Enter radius R from pole to end point of line (here, R = 5 mm).
Enter angle H from angle reference axis to R (here, H = 30°).
Resulting NC block: G10 R5 H30 *