Siemens Sinumerik 802D sl Programming Manual page 104

Enhanced Level Commands
4.1 Program support functions (1)
Type II
In contrast to type I, type II does not necessarily have to show a steady increase or
decrease along the X axis. In other words, it can also contain concaves (pockets).
Fig. 4-17
However, the Z axis profile must represent a monotone decrease or increase. For
example, the following profile cannot be machined:
Fig. 4-18
How to distinguish between type I and type II
Type I: Only one axis is specified in the first block of the contour description
Type II: Two axes are specified in the first block of the contour description
Whenever the first block does not contain a Z axis movement command and type II
should be used, W0 has to be specified.
4-104
4
Pockets in stock removal cycle (type II)
Contour which cannot be machined in G71 cycle
SINUMERIK 802D sl/840D sl840D/840Di sl/840Di/810D ISO Turning -- 04.07 Edition
3 2 1
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04.07