HEIDENHAIN TNC 620 User Manual page 162

5
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, i.e. R>0
Larger arc: CCA>180°
Enter the radius with a negative sign, i.e. 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)
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 99.9999 m.
You can also enter rotary axes A, B and C.
The control normally makes circular movements in the
active working plane. However, you can also program
circular arcs that do not lie in the active working plane. By
simultaneously rotating these circular movements you
can create spatial arcs (arcs in three axes).
10 L X+40 Y+40 RL F200 M3
11 CR X+70 Y+40 R+20 DR- (ARC 1)
or
11 CR X+70 Y+40 R+20 DR+ (ARC 2)
or
11 CR X+70 Y+40 R-20 DR- (ARC 3)
or
11 CR X+70 Y+40 R-20 DR+ (ARC 4)
162
Programming contours | Path contours — Cartesian coordinates
HEIDENHAIN | TNC 620 | Klartext Programming User's Manual | 01/2022