HEIDENHAIN TNC 426B (280 472) ISO programming - Manual (Page 172)

8 Programming: Cycles 156
ú Set-up clearance Q200 (incremental value): Distance
between tool tip and workpiece surface.
ú Depth Q201 (incremental value): Distance between
workpiece surface and bottom of hole (tip of drill
taper)
ú Feed rate for plunging Q206: Traversing speed of the
tool during drilling in mm/min
ú Plunging depth Q202 (incremental value):
Infeed per cut The TNC will go to depth in one
movement if:
■ the plunging depth is equal to the depth
■ the plunging depth is greater than the depth
The depth does not have to be a multiple of the
plunging depth.
ú Workpiece surface coordinate Q203 (absolute value):
Coordinate of the workpiece surface
ú 2nd set-up clearance Q204 (incremental value):
Coordinate in the tool axis at which no collision
between tool and workpiece (clamping devices) can
occur.
ú Decrement Q212 (incremental value): Value by which
the TNC decreases the plunging depth Q201.
ú Minimum plunging depth Q205 (incremental value): If
you have entered a decrement, the TNC limits the
plunging depth to the value entered with Q205.
ú Upper advanced stop distance Q258 (incremental):
setup clearance for rapid traverse positioning when
the TNC moves the tool again to the current plunging
depth after retraction from the hole; value for the first
plunging depth
ú Lower advanced stop distance Q259 (incremental):
setup clearance for rapid traverse positioning when
the TNC moves the tool again to the current plunging
depth after retraction from the hole; value for the last
plunging depth
If you enter Q258 not equal to Q259, the TNC will change
the advance stop distances between the first and last
plunging depths at the same rate.
ú Infeed depth for chip breaking Q257 (incremental):
Depth at which TNC carries out chip breaking. There is
no chip breaking if 0 is entered.
ú Retraction rate for chip breaking Q256 (incremental):
value by which the TNC retracts the tool during chip
breaking
ú Dwell time at depth Q211: Time in seconds that the
tool remains at the hole bottom
8.3 Dr
illing Cy
cles
Example NC block:
N12 G205 Q200=2 Q201=-80 Q206=150
Q202=15 Q203=+0 Q204=50 Q212=0.5
Q205=3 Q258=0.5 Q259=1 Q257=5
Q256=0.2 Q211=0.25*
Kkap8.pm6 29.06.2006, 08:06 156