Siemens SINUMERIK 840D Programming Manual page 329

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4.10 Extended stock removal cycle – CYCLE950 (SW 5.3 and higher)
• The infeed to the next depth, calculated in
accordance with the specifications in parameter
_MID, is carried out with G1, and paraxial
roughing then performed with G1. 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 contour", the previous
intersection is approached parallel to the contour.
• When the previous intersection is reached or for
machining "Without rounding along contour", 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.
© Siemens AG, 2002. All rights reserved
SINUMERIK 840D/840Di/810D Programming Guide Cycles (PGZ) – 11.02 Edition
4
Turning Cycles
4-329