Siemens SINUMERIK 840D Programming Manual page 268

Turning Cycles 03.96
04.00
4 4
4.10 Extended stock removal cycle - CYCLE950 (SW 5.3 and later)
_VRT (liftoff) and _ANGB (lift angle)
The parameter _VRT can be used to program the
amount of liftoff during roughing in both axes.
If _VRT=0 (parameter not programmed),
liftoff is 1 mm.
It is also possible to program the angle at which the axis
is retracted from the contour in parameter _ANGB. If
nothing is programmed, the angle is 45°.
_SDIS (safety clearance)
Parameter _SDIS determines the amount of clearance
for obstructions. This clearance is active
for retraction from a relief cut and approach to the next
relief cut, for example.
If no value is programmed, the clearance is 1 mm.
_NP5, _NP6, _NP7 (contour programming blank)
If a blank is programmed as a contour, it can be
programmed as a program name using parameter
_NP5 or as a program section with parameters
_NP6 and _NP7.
Otherwise, programming is carried out as for
finished parts (see _NP1, _NP2, _NP3).
_NP8 (name of contour program for updated
blank contour)
Cycle CYCLE950 can detect residual material that
cannot be removed with the active tool.
To continue this machining with a different tool, it is
possible to generate an updated blank contour
automatically. This is stored as a program in the part
program memory. You can specify the program name in
parameter _NP8 with or without path details (see
sample program 3).
An updated blank contour is always generated when a
travel program is generated.
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SINUMERIK 840D/840Di/810D/FM-NC Programming Guide, Cycles (PGZ) - 04.00 Edition