Siemens SINUMERIK 808D User Manual page 228

Se quence
Po sition reached prior to cycle start:
Starting position is any position from which the pocket center point can be approached at the height of the retraction plane
without collision.
Motion sequence when roughing (_VARI=X1):
With G0, the pocket center point is approached at the retraction level, and then, from this position, with G0, too, the
reference plane brought forward by the safety clearance is approached. The machining of the pocket is then carried out
according to the selected insertion strategy, taking into account the programmed blank dimensions.
Sequence of motions when finishing:
Finishing is performed in the order from the edge until the finishing allowance on the base is reached, and then the base is
finished. If one of the finishing allowances is equal to zero, this part of the finishing process is skipped.
● Finishing on the edge
While finishing on the edge, the tool traverses around the pocket contour only once.
For finishing on the edge, the path includes one quadrant reaching the pocket radius. The radius of this path is 2 mm as
the maximum or, if "less space" is provided, equals to the difference between the pocket radius and the milling radius.
The depth infeed is performed with G0 in the open towards the pocket center, and the starting point of the approach path
is also reached with G0.
● Finishing on the base
During finishing on the base, the machine performs G0 towards the pocket center until reaching a distance equal to
pocket depth + finishing allowance + safety clearance. From this point onwards, the tool is always fed in ve rtically at the
depth (since a tool with a front cutting edge is used for base finishing).
The base surface of the pocket is machined once.
In sertion strategies
For more information, see Section "Milling a rectangular pocket - POCKET3 (Page 221)".
Ta king into account the blank dimensions
During solid machining of the pockets, it is possible to take into account blank dimensions (e.g. when machining precast
parts).
With circular pockets, the blank dimension _AP1 is also a circle (with a smaller radius than the pocket radius).
Explanation of the parameters
For an explanation of the parameters _RTP, _RFP, and _SDIS, see Section "Drilling, centering - CYCLE81 (Page 157)".
For an explanation of the parameters _DP, _MID, _FAL, _FALD, _FFP1, _FFD, _CDIR, _MIDA, _AP1, _AD, _RAD1, and
_DP1, see Section "Milling a rectangular pocket - POCKET3 (Page 221)".
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Programming and Operating Manual (Milling)
6FC5398-4DP10-0BA6, 09/2017