Siemens Sinumerik 840D sl Programming Manual page 74

Additional functions
4.1 Program supporting functions
G function
G87
G89
Explanations
On using fixed cycles, the sequence of operation in general is always as described below:
● 1. Working cycle
● 2. Working cycle
● 3. Working cycle
● 4. Working cycle
● 5. Working cycle
● 6. Working cycle
Figure 4-1
74
Drilling
(-Z direction)
Spindle positioning →
Withdraw lift-off path
→ Rapid traverse →
Return lift-off path →
Spindle run right →
Cutting feedrate
Cutting feedrate
Positioning in X-Y plane with cutting feedrate or rapid traverse rate
Rapid traverse movement to plane R
Machining up to drilling depth Z
Machining at drilling base
Return up to plane R with cutting feedrate or rapid traverse rate
Rapid retraction with rapid traverse rate to positioning plane X-Y
Sequence of operations in the drilling cycle
Machining at drilling Return
base (+Z direction)
Spindle positioning Rapid traverse →
after dwelling → Return lift-off path →
Withdraw lift-off Spindle start
path
Dwell Cutting feedrate
Programming Manual, 06/09, 6FC5398-7BP10-1BA0
Applications
Drilling
Drilling
ISO Milling