Siemens SINUMERIK 840DE Programming Manual page 180

Programming Motion Commands
4.22 Chamfer, rounding (CHF, CHR, RND, RNDM, FRC, FRCM)
Example of rounding, RND
A circle contour element can be inserted with tangential link between the linear and the circle
contours in any combination.
N30 G1 X... Z... F... RND=2
The rounding is always in the plane activated with G17 to G19. The above figure shows the
rounding between two straight lines.
Here, the figure shows the rounding between a straight line and a circle.
N30 G1 X... Z... F... RND=2
N40 G3 X... Z... I... K...
4-74
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Fundamentals