Preconditions - Siemens SINUMERIK 840D Programming Manual

Drilling Cycles and Drilling Patterns
2
2.1 Drilling cycles
There are two types of parameter:
• Geometrical parameters and
• Machining parameters
Geometrical parameters are identical for all drilling
cycles, drilling pattern cycles and milling cycles.
They define the reference and retraction planes, the
safety clearance and the absolute and relative final
drilling depths. Geometrical parameters are written
once in the first drilling cycle CYCLE81.
The machining parameters have a different meaning
and effect in each cycle. They are therefore written
in each cycle.

2.1.1 Preconditions

Call and return conditions
Drilling cycles are programmed independently of the
actual axis names. The drilling position must be
approached in the higher-level program before the
cycle is called.
The required values for the feedrate, spindle speed
and spindle direction of rotation must be
programmed in the part program if there are no
assignment parameters for these values in the
drilling cycle.
The G function and current frame active before the
cycle was called remain active beyond the cycle.
2-50
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide, Cycles (PGZ) - 04.00 Edition
03.96
2
Geometrical parameters
Retraction plane
Safety clearance
Reference plane
Final drilling
depth
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