HEIDENHAIN MANUALplus 4110 - Manual (Page 350)

350 6 DIN Programming
6.16 Under
c
ut Cy
cles
Undercut type U G856
Cycle G856 machines an undercut and finishes the adjoining plane
surface. A chamfer or rounding (optional) can be machined.
Parameters
 I undercut diameter (diameter value)
 K undercut length
 B chamfer/rounding
„ B>0: Radius of rounding
„ B<0: Width of chamfer
Note on the execution of the cycle:
„ At the end of cycle, the tool returns to the starting point.
„ If the cutting width of the tool is not defined, the control assumes
that the tool's cutting width equals "K."
Blocks following the cycle call
Example: G856
%856.nc
[G856]
N1 T30 G95 F0.23 G96 S248 M3
N2 G0 X60 Z2
N3 G856 I47 K7 B1
N4 G0 X50 Z-30
N5 G1 X60
N6 G80
END
N.. G856 I.. K.. /Cycle call
N.. G0 X.. Z.. /Undercut corner
N.. G1 X.. /End point of plane surface
N.. G80 /End of contour definition
„ Undercuts can only be executed in orthogonal, paraxial
contour corners along the longitudinal axis.
„ Cutting radius compensation: Active.
„ Oversizes: are not taken into account.