Requirements - Siemens SINUMERIK 808D User Manual

See the following illustration for drilling, centering - CYCLE81:
The machining parameters have a different meaning and effect in the individual cycles. They are therefore programmed in
each cycle separately.
12.4.2

Requirements

C a ll 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 feedrate, spindle speed and direction of spindle rotation must be programmed in the part program if
there are no defining parameters in the drilling cycle.
The G functions and the current data record active before the cycle was called remain active beyond the cycle.
Pl ane definition
In the case of drilling cycles, it is generally assumed that the current workpiece coordinate system in which the machining
operation is to be performed is to be defined by selecting plane G17, G18 or G19 and activating a programmable offset. The
drilling axis is always the axis of this coordinate system which stands vertically to the current plane.
A tool length compensation must be selected before the cycle is called. Its effect is always perpendicular to the selected
plane and remains active even after the end of the cycle.
See the following illustration for length compensation:
Programming and Operating Manual (Milling)
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6FC5398-4DP10-0BA6, 09/2017