HEIDENHAIN TNC 407 (280 580) User Manual - Manual (Page 124)

5-25 TNC 425/TNC 415 B/TNC 407
5 Programming Tool Movements
Fig. 5.31: Circular path from S to E with
radius R
Fig. 5.33: Circular arcs with central angles greater than and less
than 180°
5.4 Path Contours - Cartesian Coordinates
Fig. 5.32: Full circle with two CR blocks
CC
R
S E
R
CC
R
S E
R
CCA>180 °
CCA
CCA
CCA<180 °
E
S
R
S1=E2
E1=S2
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 99.999 m.
• You can also enter rotary axes (A, B, C).
Central angle CCA and arc radius R
Starting point S and end point
E
can be connect-
ed by four different arcs with the same radius. The
arcs differ in their curvatures and lengths.
To program an arc larger than a semicircle
(CCA>180°), enter the radius R with a negative
sign (R<0).
To program an arc smaller than a semicircle
(CCA<180°) enter the radius R with a positive
sign (R>0).