Siemens Sinumerik 802D sl Programming Manual page 120

Enhanced Level Commands
4.1 Program support functions (1)
Return point level (G98/G99)
When the G code system A is active, the tool traverse away from the bottom of a
hole and goes back to the initial level. When specifying G98 while the G code sy-
stem B or C is active, the tool, coming from the bottom of a hole, returns to the in-
itial level. When specifying G99, the tool returns to the R level from the bottom of a
hole.
The figure below describes the movement of the tool when G98 or G99 is speci-
fied. G99 is generally applied for the first drilling operation, while G98 is applied for
the last drilling operation. Even when drilling is performed in the G99 mode, the
initial level does not change.
G98 (Return to initial level)
Fig. 4-32
Repetition
Specify the number of repeats in K in order to repeat the drilling for equally spaced
holes. K only becomes effective in the block where it is specified. Specifying the
first hole in absolute mode (G90) results in drilling at the same position. Therefore,
specify K in incremental mode (G91).
Drilling data is stored, but drilling is not performed whenever K0 is specified.
Cancel
Use G80 or a group 01 G code (G00, G01, G02, G03) to cancel a canned cycle.
4-120
Initial level
Return point level (G98/G99)
SINUMERIK 802D sl/840D sl840D/840Di sl/840Di/810D ISO Turning -- 04.07 Edition
G99 (Return to point R level)
Point R level
© SIEMENS AG 2007 All rights reserved
04.07