HEIDENHAIN TNC 360 ISO Programming - Manual (Page 104)

5-21 TNC 360
5 Programming Tool Movements
Fig. 5.26: Circular path from S to E with
radius R
Fig. 5.27: Full circle with two G02 blocks
Fig. 5.28: Circular arcs with central angles greater than and less
than 180°
5.4 Path Contours - Cartesian Coordinates
S1=E2
E1=S2
R
S E
R
R
S E
R
CCA>180 °
CCA
CCA
CCA<180 °
E
S
R
Circular path G02/G03/G05 with defined radius
The tool moves on a circular path with the radius R.
Defining the direction of rotation
• Clockwise rotation G02
• Counterclockwise rotation G03
• No direction of rotation defined G05
The tool moves in the direction of rotation
defined in an earlier block.
Input
• Coordinates of the arc end point
• Arc radius R
• To program a full circle you must enter two successive G02/G03
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).
Central angle CCA and 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.
Large circular arc: CCA>180° (the circular arc is
longer than a semicircle)
Input: radius R with negative sign (R<0).
Small circular arc: CCA<180° (the circular arc is
shorter than a semicircle)
Input: radius R with positive sign (R>0).