Siemens SINUMERIK 840D Programming Manual page 264

Turning Cycles
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4.10 Extended stock removal cycle - CYCLE950 (SW 5.3 and later)
The feedrate during roughing is calculated
internally in the cycle according to the path as the
feedrate that results from the values specified for
longitudinal and face feed (_FF1 and _FF2).
• For "Rounding along contours", the previous
intersection is approached parallel to the contour.
• When the previous intersection is reached or for
machining "Without rounding along contours", the
tool is lifted off at the angle programmed in
_ANGB and then retracted to the starting point for
the next infeed with G0. If the angle is 45
degrees, the programmed liftoff path _VRT is
also followed precisely; it is not exceeded for
other angles.
• This procedure is repeated until the full depth of the
machining section has been reached.
Sequence of motions for roughing in parallel with
contour:
• The starting point for roughing and the individual
infeed depths are calculated as for paraxial
roughing and approached with G0 or G1.
• Roughing is carried out in contour-parallel paths.
• Liftoff and retraction is carried out in the same
way as for paraxial roughing.
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SINUMERIK 840D/840Di/810D/FM-NC Programming Guide, Cycles (PGZ) - 04.00 Edition
03.96
04.00
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