Undercut Type U G856 - HEIDENHAIN CNC PILOT 640 User Manual

DIN/ISO programming | Undercut cycles

Undercut type U G856

G856 machines an undercut and finishes the adjoining plane
surface. A Chamf./round. (optional) can be machined.
Tool position at the end of the cycle: Cycle starting point.
Parameters:
I: Undercut diameter (default: standard table)
K: Undercut length (default: standard table)
B: -B cham./+B round.
B > 0: Radius of rounding
B < 0: Width of chamfer
Blocks following the cycle call
N.. G856 I.. K..
N.. G0 X.. Z..
N.. G1 X..
N.. G80
Undercuts can only be executed in orthogonal,
paraxial contour corners along the longitudinal axis
Cutter radius compensation is active
Oversizes are not offset
If the cutting width of the tool is not defined, the
control assumes that the tool's cutting width equals
K.
Example: G856
%856.nc
N1 T2 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
HEIDENHAIN | User's Manual smart.Turn and DIN Programming | 12/2017
Cycle call
Undercut corner
End point on plane surface
End of contour definition
4
369