HEIDENHAIN TNC 426B (280 472) ISO programming - Manual (Page 122)

106 6 Programming: Programming Contours
6.4 P
ath Cont
ours — Car
tesian Coor
dinat
es
Central angle CCA and arc radius R
The starting and end points on the contour can be connected with
four arcs of the same radius:
Smaller arc: CCA<180°
Enter the radius with a positive sign R>0
Larger arc: CCA>180°
Enter the radius with a negative sign R<0
The direction of rotation determines whether the arc is curving
outward (convex) or curving inward (concave):
Convex: Direction of rotation G02 (with radius compensation G41)
Concave: Direction of rotation G03 (with radius compensation G41)
Example NC blocks
See figure at right.
N100 G01 G41 X+40 Y+40 F200 M3 *
N110 G02 X+70 Y+40 R+20 * (arc 1)
or
N110 G03 X+70 Y+40 R+20 * (arc 2)
or
N110 G02 X+70 Y+40 R-20 * (arc 3)
or
N110 G03 X+70 Y+40 R-20 * (arc 4)
The distance from the starting and end points of the arc
diameter cannot be greater than the diameter of the arc.
The maximum radius is 99 999 mm
(TNC 410: 9999 mm).
You can also enter rotary axes A, B and C.
X
Y
ZW
R R
40
40 70
1
2
G03
G02
X
Y
40
40 70
G03
4
ZW
3
R R
G02
Gkap6.pm6 29.06.2006, 08:06 106