Siemens Sinumerik 840D sl Programming Manual page 102

Additional functions
4.1 Program supporting functions
Explanations
The cycle creates the following sequence of motions:
● Approach of reference plane shifted by the amount of the safety clearance with G0.
● Oriented spindle stop and transfer of spindle in the Axis mode.
● Tapping to the final drilling depth.
● Execution of dwell time at thread depth.
● Retraction to the reference plane and reversion of direction of rotation brought forward by
● Retraction to the retraction plane with G0.
During tapping, rapid traverse override and spindle override are accepted at 100%.
The speed of rotation can be affected during the retraction with GUD _ZSFI[2]. Example:
_ZSFI[2]=120; the retraction takes place at 120% of the speed during tapping.
Restrictions
Changeover of the axes
Before changing over the drilling axis, one must first deselect the fixed cycle. An alarm is
output if the drilling axis in the "Drilling without compensating chuck" mode is changed over.
Tapping
The drilling cycle is executed only if an axis motion, e.g. is programmed with X, Y, Z or R.
R
Always program R only in one block with an axis motion, otherwise the programmed values
are not stored modally.
Deselection
The G functions of Group 01 (G00 to G03) and G84 should not be used together in one
block, as otherwise G84 is deselected.
S command
An error message is displayed if the specified gear stage is one step higher than the
maximum permissible value.
F function
An error message is displayed if the value specified for the cutting feedrate exceeds the
maximum permissible value.
102
the safety clearance.
Programming Manual, 06/09, 6FC5398-7BP10-1BA0
ISO Milling