Siemens SINUMERIK 840D Programming Manual page 332

4
Turning Cycles
4.10 Extended stock removal cycle – CYCLE950 (SW 5.3 and higher)
_MID (infeed depth for roughing)
The infeed depth for roughing is programmed with the parameter
_MID. Roughing steps are generated with this infeed until the
remaining depth is less than twice the infeed depth. Then two steps
are performed each at half of the remaining depth. _MID is inter-
preted as a radius or diameter depending on the value of cycle setting
data _ZSD[0] if the facing axis is involved in the infeed for roughing.
_ZSD[0]=0: _MID is interpreted according to the G group for radius/
diameter programming, as a radius with DIAMOF,
otherwise as a diameter.
_ZSD[0]=1: _MID is a radius value
_ZSD[0]=2: _MID is a diameter value
When rough cutting parallel to contour, the infeed depth does not act
in relation to the specified infeed axis but vertically to the contour. This
always results in more cuts than in paraxial rough-cutting with the
same value for infeed depth.
_FALZ, _FALX (machining allowance)
The default for a final machining allowance for roughing
is provided by the parameters FALZ (for Z axis) and FALX (for X axis).
Roughing always takes place down to theses final machining
allowances. If no machining allowances are programmed, stock
removal is performed up to the end contour during roughing.
If final machining allowances are programmed, these are applied
correspondingly.
_FF1, _FF2, _FF3 and FF4 (feedrate)
Separate feedrates can be specified for roughing
and finishing, as shown in the figure opposite.
Separate feedrates apply for longitudinal (_FF1) and
face (_FF2) during roughing. If inclined or circular path
sections are traversed when machining the contour, the
appropriate feedrate is calculated automatically inside
the cycle.
The feedrates programmed at the contour are active
during finishing. If none are programmed there, the
finishing feedrate in _FF3 and the feedrates at radii
and chamfers in _FF4 apply to these contour
transition elements.
(see sample program 1 for programming of the parts
in the figure below)
4-332
G0
X
_FF2
resulting feed
from_FF1 and
_FF2
_FF3
X
_FF4 (chamfer)
SINUMERIK 840D/840Di/810D Programming Guide Cycles (PGZ) – 11.02 Edition
4
03.96
10.00
G1/G2/G3
roughing
_FF1
Z
finishing
_FF3
_FF3
_FF4 (radius)
Z
© Siemens AG, 2002. All rights reserved