Siemens SINUMERIK 840D Programming Manual page 79

03.96
2
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 clearance with G0
• Traverse to final drilling depth with G1 and the
feedrate programmed before the program call
• Dwell time at final drilling depth
• Oriented spindle stop at the spindle position
programmed under POSS
• Traverse retraction path in up to three axes with G0
• Retraction to the reference plane brought forward
by the safety clearance with G0
• Retraction to the retraction plane with G0 (initial
drilling position in both axes on the plane)
Description of parameters
See Section 2.1.2. (Drilling, Centering – CYCLE81)
for a description of parameters RTP, RFP, SDIS,
DP, DPR
DTB (dwell time)
Parameter DTB is the dwell time at the final drilling
depth (chip breaking) in seconds.
SDIR (direction of rotation)
With this parameter you determine the direction of
rotation with which boring is performed in the cycle. If
values other than 3 or 4 (M3/M4) are generated, alarm
61102 "No spindle direction programmed"
is output and the cycle is not executed.
 Siemens AG 2000 All rights reserved.
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide, Cycles (PGZ) - 04.00 Edition
Drilling Cycles and Drilling Patterns
2.1 Drilling cycles
Z
Z
X
2
X
G0
G1
G4
SPOS
RTP
RFP+SDIS
RFP
DP=
RFP-DPR
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