HEIDENHAIN TNC 320 User Manual page 243

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 NC blocks
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.
HEIDENHAIN | TNC 320 | Conversational Programming User's Manual | 9/2016
Path contours  Cartesian coordinates
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