Siemens SINUMERIK 808D ADVANCED Programming And Operating Manual page 202

_MIDA (max. infeed width)
Use this parameter to define the maximum infeed width when solid machining in a plane. Analogously to the known
calculation method for the infeed depth (equal distribution of the total depth with maximum possible value) the width is
distributed equally, maximally with the value programmed under _MIDA.
If this parameter is not programmed or has value 0, the cycle will internally use 80% of the milling tool diameter as the
maximum infeed width.
Note
Applies if the calculated width infeed from edge machining is recalculated when reaching the full pocket in the depth;
otherwise the width infeed calculated at the beginning is kept for the whole cycle.
_AP1, _AP2, _AD (blank dimensions)
Use the parameters _AP1, _AP2 and _AD to define the blank dimensions (incremental) of the pocket in the plane and in the
depth.
_RAD1 (radius)
Use the _RAD1 parameter to define the radius of the helical path (relative to the tool center point path) or the maximum
insertion angle for the reciprocating motion.
_DP1 (insertion depth)
Use the parameter _DP1 to define the infeed depth when inserting to the helical path.
A tool compensation must be programmed before the cycle is called. Otherwise, the cycle is aborted and alarm 61000 "No
tool compensation active" is output.
Internally in the cycle, a new current workpiece coordinate system is used which influences the actual value display. The
zero point of this coordinate system is to be found in the pocket center point. At the end of the cycle, the original coordinate
system is active again.
Programming example: Pocket
Use this program to machine a pocket in the XY plane which is 60 mm in length, 40 mm in width, and which has a corner
radius of 8 mm and is 17.5 mm in depth. The pocket has an angle of 0 degrees to the X axis. The final machining allowance
of the pocket edges is 0.75 mm, 0.2 mm at the base, the safety clearance in the Z axis, which is added to the reference
plane, is 0.5 mm. The center point of the pocket lies at X60 and Y40, the maximum depth infeed is 4 mm.
The machining direction results from the direction of rotation of the spindle in the case of down-cut milling. A milling cutter
with 5 mm radius is used.
Merely a rough machining operation is to be carried out.
See the following programming example for rectangular pocket:
N10 G90 T1 D1 S600 M4
N20 G17 G0 X60 Y40 Z5
202
; Specification of technology values
; Approach starting position
Programming and Operating Manual (Milling)
6FC5398-4DP10-0BA1, 01/2014