HEIDENHAIN TNC 426B (280 472) ISO programming - Manual (Page 124)

108 6 Programming: Programming Contours
6.4 P
ath Cont
ours — Car
tesian Coor
dinat
es
Rounding corners G25
The G25 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 large enough to accommodate the tool.
25 ú Confirm your entry with the ENT key.
ú Rounding radius: Enter the radius of the circular arc
ú Feed rate for rounding the corner.
Example NC blocks
N50 G01 G41 X+10 Y+40 F300 M3 *
N60 X+40 Y+25 *
N70 G25 R5 F100 *
N80 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 G25 block is effective
only in that block. After the G25 block, the previous feed
rate becomes effective again.
You can also use a G25 block for a tangential contour
approach (see Section „6.3 Contour Approach and
Departure“).
X
Y
40
40
R5
5
10
25
Gkap6.pm6 29.06.2006, 08:06 108