HEIDENHAIN TNC 640, User Manual, Page: 301 / 948

Programming Contours | Path contours

Cartesian coordinates
7
HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
301
Rounded corners RND
The
RND
function rounds off contour corners.
The tool moves on an arc that is tangentially connected to both the
preceding and subsequent contour elements.
The rounding arc must be machinable with the called tool.
Rounding radius
: Enter the radius, and if
necessary:
Feed F
(effective only in the
RND
block)
Example
5 L X+10 Y+40 RL F300 M3
6 L X+40 Y+25
7 RND R5 F100
8 L X+10 Y+5
In the preceding and subsequent contour elements,
both coordinates must lie in the plane of the rounding
arc. If you machine the contour without tool-radius
compensation, you must program both coordinates in
the plane.
The corner point is cut off by the rounding arc and is not
part of the contour.
A feed rate programmed in the
RND
block is effective
only in that
RND
block. After the
RND
block, the previous
feed rate becomes effective again.
You can also use an
RND
block for a tangential contour
approach.