HEIDENHAIN TNC 320 (77185x-01) - Manual (Page 199)

Path contours - Cartesian coordinates 6.4
6
TNC 320 | User's Manual
HEIDENHAIN Conversational Programming | 3/2014
199
Corner rounding RND
The RND function is used for rounding off 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 of the arc, and if
necessary:
Feed rate 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 working 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.