HEIDENHAIN MANUALplus 4110 - Manual (Page 345)

HEIDENHAIN MANUALplus 4110 345
6.16 Under
c
ut Cy
cles
Undercut cycle G85
With the function G85, you can machine undercuts according to
DIN 509 E, DIN 509 F and DIN 76 (thread undercut). The adjoining
cylinder is machined if you position the tool at the cylinder diameter "in
front of" the cylinder. If the tool is not positioned at the cylinder
diameter, it approaches the workpiece on a diagonal path to machine
the undercut.
Parameters
 X target point (diameter value)
 Z target point
 I finishing oversize/depth
„ DIN 509 E, F: Finishing oversize (default: 0)
„ DIN 76: Undercut depth
 K undercut length (and undercut type)
„ No input: Undercut DIN 509 E
„ K=0: Undercut DIN 509 F
„ K>0: Undercut length for DIN 76
 E reduced feed rate: for machining the undercut (default: Active
feed rate)
The control determines the undercut parameters from the cylinder
diameter (see tables).
Example: G85
%85.nc
[G85]
N1 T21 G95 F0.23 G96 S248 M3
N2 G0 X62 Z2
N3 G85 X60 Z-30 I0.3
N4 G1 X80
N5 G85 X80 Z-40 K0
N6 G1 X100
N7 G85 X100 Z-60 I1.2 K6 E0.11
N8 G1 X110
END
„ Undercuts can only be executed in orthogonal, paraxial
contour corners along the longitudinal axis.
„ Cutter radius compensation: is not carried out—You
can program TRC separately with G41/G42 and switch it
off again with G40.
„ Oversizes: are not taken into account.