Drilling cycle (G81, W5DDrill(481))
Drilling cycle drills holes with rapid approach to the safe level and rapid retract the safe plane level.
    
Drilling cycle <G81> consist of the following steps:
- Rapid tool motion to the hole center at the <Z return> level. 
- Rapid descend to the <Z safe> level. 
- Work feedrate motion to the <Z min> level. 
- Rapid tool return to the <Z return> level. 
See also:
The ways of the holes machining