Siemens SINUMERIK 808D User Manual page 224

The basic sizes for the length and width (_AP1 and _AP2) are programmed without sign and their symmetrical positions
around the pocket center point are computed in the cycle. You define the part of the pocket which is no longer to be
machined by solid machining. The blank dimension for the depth (_AD) is also programmed without sign and taken into
account by the reference plane in the direction of the pocket depth.
The depth infeed (including blank dimensions) is carried out according to the programmed type (helical path, reciprocating,
vertically). If the cycle detects that there is space enough in the pocket center because of the given blank contour and the
radius of the active tool, the infeed is carried out vertically to the pocket center point as long as it is possible in order not to
traverse extensive insertion paths in the open.
Solid machining of the pocket is carried out starting from the top downwards.
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 _DP parameter, see Section "Long holes located on a circle - LONGHOLE (Page 207)".
_L ENG, _WID and _CRAD (pocket length, pocket width and corner radius)
Use the parameters _LENG, _WID and _CRAD to define the form of a pocket in the plane.
If you cannot traverse the programmed corner radius with the active tool since its radius is larger, then the corner radius of
the machine pocket corresponds to the tool radius.
If the milling tool radius is larger than half of the length or width of the pocket, then the cycle will be aborted and alarm 61105
"Cutter radius too large" is output.
_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.
Programming and Operating Manual (Milling)
224
6FC5398-4DP10-0BA6, 09/2017