Siemens Sinumerik 840D sl Programming Manual page 97

Figure 4-13
Explanations
This cycle is similar to G86, with the only exception that here, a dwell time at the bottom of
the hole is still available.
Before programming G89, the spindle must be started with an M function.
Restrictions
Changeover of the axes
Before changing over the drilling axis, one must first deselect the fixed cycle.
Drilling
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 G89 should not be used together in one
block, as otherwise G89 is deselected.
ISO Milling
Programming Manual, 06/09, 6FC5398-7BP10-1BA0
Boring cycle (G89)
Additional functions
4.1 Program supporting functions
97