HEIDENHAIN TNC 370 User Manual page 120

5
Programming Tool Movements
5.4 Path Contours - Cartesian Coordinates
Direction of rotation DR and arc shape
This direction of rotation determines whether the arc is
l
convex (curved outward) or
l
concave (curved inward)
RL,DR-,(R<O)
Fig. 5.30: Convex path
RL,DR+,(R>O)
Fig. 5.31: Concave path
To program a circular arc with defined radius:
\
J
Enter the coordinates of the arc end point, for example X = 10 mm,
Y=Zmm.
,
r
\
CIRaE RADlEUS (SXGN) a
J
Enter the arc radius, for example R = 5 mm; and determine the size
of the arc using the sign, here the negative sign.
/
c
,
ROTATION CLOCIKWISE: DR- P
c
i
lx
0
or 2x
0 Define the circular arc with a negative (DR-) or positive direction of
rotation (DR+).
' . _ _
Resulting NC block: CR X+ 10 Y+2 R-5 DR- RL
L
TNC 370
5-21