HEIDENHAIN CNC Pilot 4290 V7.1 - Manual (Page 228)

228
4.20 Cont
our
-Based T
u
rn
ing Cy
cles
Finish contour G890
G890 finishes the contour area defined by NS, NE in one pass and
takes chamfers/rounding arc into account. The operation proceeds
from NS to NE.
Omit-codes for recesses and undercuts
G call Function D code
G22 Recess for sealing ring 512
G22 Recess for guard ring 1.024
G23 H0 General recess 256
G23 H1 Relief turn 2.048
G23 H4 Undercut type U 32.768
G23 H5 Undercut type E 65.536
G23 H6 Undercut type F 131.072
G23 H7 Undercut type G 262.744
G23 H8 Undercut type H 524.288
G23 H9 Undercut type K 1.048.576
Add the codes if you want to skip several elements.
K
1
2
H=
2
0
Q = 3
Z
Q=
1
X
Z
I Ø
Parameters
NS Starting block number (beginning of contour section)
NE End block number (end of contour section)
„ NE not programmed: The contour element NS is machined
in the direction of contour definition.
„ NS=NE programmed: The contour element NS is machined
opposite to the direction of contour definition.
E Plunging behavior
„ E=0: Descending contours are not machined.
„ E>0: Plunging feed rate
„ No input: Machine falling contours at programmed feed rate
V Identifier beginning/end (default: 0)
A chamfer/rounding arc is machined:
„ V=0: At start and end
„ V=1: At start
„ V=2: At end
„ V=3: No machining
„ V=4: Chamfer/rounding arc is machined, not the basic
element (prerequisite: Contour section with one element)
Q Type of approach (default: 0)
„ Q=0: Automatic selection—the CNC PILOT checks:
„ Diagonal approach
„ First X, then Z direction
„ Equidistant around the barrier
„ Omission of the first contour element if the starting
position is inaccessible
„ Q=1: First X, then Z direction
„ Q=2: First Z, then X direction
„ Q=3: No approach—tool is located near the starting point of
the contour area.
„ Q=4: Residual finishing