HEIDENHAIN TNC 360 User Manual - Manual (Page 104)

TNC 360 5-20
5 Programming Tool Movements
Fig. 5.28: Circular arcs with central angles greater than and less than
180°
Fig. 5.27: Full circle with two CR-blocks
Fig. 5.26: Circular path from S to E with
radius R
5.4 Path Contours – Cartesian Coordinates
E
S
R
S1=E2
E1=S2
R
S E
R
R
S E
R
CCA>180 °
CCA
CCA
CCA<180 °
Circular path CR with defined radius
The tool moves on a circular path with the radius R.
Input
• Coordinates of the arc end point
• Arc radius R
• Direction of rotation DR
• To program a full circle with CR you must enter two successive CR-
blocks.
• The distance from the starting point to the end point cannot be
larger than the diameter of the circle.
• The maximum permissible radius is 30 m (9.8 ft).
Arc radius R
Starting point S and end point E can be con-
nected by four different arcs with the same radius.
The arcs differ in their curvatures and lengths.
To program a large semicircle enter the radius R
with a negative sign (R<0).
To program a arc small semicircle: enter the radius
R with a positive sign (R>0).