HEIDENHAIN TNC 407 (280 580) User Manual - Manual (Page 125)

TNC 425/TNC 415 B/TNC 407 5-26
5 Programming Tool Movements
Fig. 5.34: Convex path
5.4 Path Contours - Cartesian Coordinates
+/ +/
ENT
+/
5 e.g.
CR
1 e.g. 0 X
2 Y
ENT
or 1x 2x
ENT
To program a circular arc with defined radius:
COORDINATES ?
Enter the coordinates of the arc end point, for example X=10 mm,
Y=2 mm.
CIRCLE RADIUS (SIGN) ?
Enter the arc radius, for example R=5 mm; and determine the size of
the arc using the sign, here the negative sign.
ROTATION CLOCKWISE: DR-?
Define circular arc with negative (DR–) or positive direction of rotation
(DR+).
If necessary, enter also:
• Radius compensation
• Feed rate
• Miscellaneous function
Resulting NC block: CR X+10 Y+2 R-5 DR– RL
RL,DR–,(R<0)
Fig. 5.35: Concave path
RL,DR+,(R>0)
Direction of rotation DR and arc shape
The direction of rotation determines whether the arc is
• convex (curved outwards) or
• concave (curved inwards)