HEIDENHAIN TNC 370 - Page 119

5 Programming Tool Movements
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5.4 Path Contours - Cartesian Coordinates
Circular path CR with defined radius
The tool moves on a circular path with the radius R
input
l Coordinates of the arc end point
l Arc radius R
l Direction of rotation DR
Arc radius R
Starting point @ and end point @ can be con-
nected by four different arcs with the same radius.
The arcs differ in their curvatures and lengths.
To program a large circular arc: CCA > 180”(arc is
greater than a semicircle), enter the radius R with a
negative sign (R<O).
To program a small circular arc: CCA < 180”(arc is
smaller than a semicircle), enter the radius R with a
positive sign (R>O).
R
\
0
0
/
‘ig. 5.27:
Circular path from @) to @ with
radius 13
Sl =E2
I
Fig. 5.28:
Full circle with two CR blocks
\\
\.
,,’
-.
-____*
,’
CCA>180”
__----_
,’
-.
I
‘\
,’
\\
/.y;,.
CCAe180”
Fig. 5.29: Arcs with central angles greater than and less than 180”
J
5-20
TNC 370
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