HEIDENHAIN TNC 320 (340 551-02) - Manual (Page 133)

HEIDENHAIN TNC 320 133
6.4 P
a
th Cont
ours—Car
te
sian Coor
dinat
e
s
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 DR– (with radius compensation RL)
Concave: Direction of rotation DR+ (with radius compensation RL)
Example NC blocks
or
or
or
10 L X+40 Y+40 RL F200 M3
11 CR X+70 Y+40 R+20 DR- (ARC 1)
11 CR X+70 Y+40 R+20 DR+ (ARC 2)
11 CR X+70 Y+40 R-20 DR- (ARC 3)
11 CR X+70 Y+40 R-20 DR+ (ARC 4)
The distance from the starting and end points of the arc
diameter cannot be greater than the diameter of the arc.
X
Y
40
40 70
DR+
4
ZW
3
R R
X
Y
ZW
R R
40
40 70
1
2
DR+