Siemens SINUMERIK 840D Programming Manual page 79

2
03.96
08.97
Sequence of operations
Position reached prior to cycle start:
The drilling position is the position in the two axes of
the selected plane.
The cycle implements the following motion
sequence:
• Approach of the reference plane brought forward
by the safety distance with G0
• Oriented spindle stop with SPOS (value in
parameter POSS) and conversion of spindle to
axis mode
• Tapping to final drilling depth with G331 and
speed SST
• Dwell time at thread depth (parameter DTB)
• Retraction to the reference plane brought forward
by the safety distance with G332, spindle speed
SST1 and reversal of direction of rotation
• Retraction to the retraction plane with G0, spindle
mode is reintroduced by reprogramming the
spindle speed active before the cycle was called
and the direction of rotation programmed under
SDAC.
Description of parameters
See Subsection 2.1.2. (Drilling, Centering –
CYCLE81) for a description of parameters RTP,
RFP, SDIS, DP, DPR
DTB (dwell time)
You program the dwell time in seconds. It is
recommended that the dwell time is omitted for the
tapping of blind holes.
SDAC (direction of rotation after end of cycle)
Under SDAC you program the direction of rotation
after completion of the cycle.
For tapping, the direction is changed automatically
by the cycle.
© Siemens AG, 2002. All rights reserved
SINUMERIK 840D/840Di/810D Programming Guide Cycles (PGZ) – 11.02 Edition
Drilling Cycles and Drilling Patterns
2.1 Drilling cycles
Z
SDAC
Z
X
2
X
G0
G331
G332
G4
RTP
RFP+SDIS
RFP
DP=RFP-DPR
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