Siemens SINUMERIK 808D ADVANCED Programming And Operating Manual page 201

_PA, _PO (reference point)
Use the parameters _PA and _PO to define the reference point of the pocket in the axes of the plane. This is the pocket
center point.
_STA (angle)
_STA indicates the angle between the first axis of the plane (abscissa) and the longitudinal axis of the pocket.
_MID (infeed depth)
Use this parameter to define the maximum infeed depth when roughing.
The depth infeed is performed by the cycle in equally-sized infeed steps.
By using _MID and the entire depth, the cycle calculates this infeed automatically. The minimum possible number of infeed
steps is used as the basis.
_MID=0 means that the cut to pocket depth is made with one feed.
_FAL (finishing allowance at edge)
The finishing allowance only affects the machining of the pocket in the plane on the edge.
If the final machining allowance ≥ tool diameter, the pocket will not necessarily be machined completely. The message
"Caution: final machining allowance ≥ tool diameter" appears; the cycle, however, is continued.
_FALD (finishing allowance at the base)
When roughing, a separate finishing allowance is taken into account at the base.
_FFD and _FFP1 (feedrate for depth and surface)
The feedrate _FFD is effective when inserting into the material.
The feedrate _FFP1 is active for all movements in the plane traversed at feedrate when machining.
_CDIR (milling direction)
Use this parameter to specify the machining direction for the pocket.
Using the parameter _CDIR, the milling direction can be programmed directly with "2 for G2" and "3 for G3", or alternatively
with "synchronous milling" or "conventional milling".
Synchronized operation or reverse rotation are determined internally in the cycle via the direction of rotation of the spindle
activated prior to calling the cycle.
Down-cut milling
M3 → G3
M4 → G2
_VARI (machining type)
Use the parameter VARI to define the machining type.
Possible values are:
Units digit:
● 1=roughing
● 2=finishing
Tens digit (infeed):
● 0=vertically to pocket center with G0
● 1=vertically to pocket center with G1
● 2=along a helical path
● 3=oscillating to pocket length axis
If a different value is programmed for the parameter _VARI, the cycle is aborted after output of alarm 61002 "Machining type
defined incorrectly".
Programming and Operating Manual (Milling)
6FC5398-4DP10-0BA1, 01/2014
Up-cut milling
M3 → G2
M4 → G3
201