Parameters - Siemens SINUMERIK 840D Programming Manual

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12.97
08.99
3.15 Pocket milling with islands – CYCLE73, CYCLE74, CYCLE75
• When the pocket has been machined, the tool is
retracted either to the return plane or by the safety
distance via the reference plane, depending on the
selected liftoff mode. The tool position in the plane is
above the pocket surface as determined by the
generated program.
Sequence of motions for finishing
(_VARI=XXX3)
• The pocket and island contours are
circumnavigated once each during the edge
finishing operation. Vertical insertion with G1
(_VARI) must be programmed as the insertion
strategy. Approach and retraction at the start and
edge points respectively of the finishing operation
are each executed along a tangential circle
segment.
• To finish the base, the tool is inserted to pocket
depth + final machining allowance + safety
distance with G0. From this position the tool is
fed in vertically at the feedrate for depth infeed.
The base surface of the pocket is machined
once.
• Liftoff and retraction as the same as for solid
machining.
• Parameters _FAL, _FALD and _VARI=XXX4
must be assigned for simultaneous finishing in
the plane and on the base.
© Siemens AG, 2002. All rights reserved
SINUMERIK 840D/840Di/810D Programming Guide Cycles (PGZ) – 11.02 Edition
3
Milling Cycles
3-209