Siemens SINUMERIK 840D Programming Manual page 228

Turning Cycles
4
4.5 Stock removal cycle – CYCLE95
Sequence of operations
Position reached prior to cycle start:
The starting position can be any position from which
the starting point of the contour can be approached
without collision.
The cycle implements the following motion
sequence:
• The cycle starting point is calculated in the cycle
and then approached in both axes simultaneously
with G0.
Roughing without relief cut elements:
• Paraxial infeed to the actual depth is calculated
internally and then approached with G0.
• Approach roughing point paraxially with G1 and
feedrate FF1.
• Machine parallel to the contour at contour
+ final machining allowance to the last roughing
intersection point with G1/G2/G3 and FF1.
• Lift off contour by the amount programmed in
_VRT in every axis and retraction with G0.
• This procedure is repeated until the total depth
of the section to the machining step has been
reached.
• When roughing without relief cut elements,
retraction to the cycle starting point is effected
axis by axis.
Roughing the relief cut elements:
• Approach the starting point for the next relief cut
axis by axis with G0. An additional safety
clearance is calculated internally.
• Infeed parallel to the contour + final machining
allowance with G1/G2/G3 and FF2.
• Approach roughing point paraxially with G1 and
feedrate FF1.
• Machine to the last roughing point. Lift and retract
as in the first machining section.
• If further relief cut elements are to be machined,
repeat the above procedure for each relief cut
element.
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X
X
Roughing without relief cut
Roughing of the first relief cut
Roughing of the second relief cut
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide, Cycles (PGZ) - 04.00 Edition
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