Siemens SINUMERIK 840D Programming Manual page 92

2
Drilling Cycles and Drilling Patterns
2.1 Drilling cycles
The cycle implements the following motion
sequence:
• Approach of the reference plane brought forward by
the safety distance with G0
• Traverse to final drilling depth with G1 and at the
feedrate programmed under parameter FFR
• Dwell time at final drilling depth
• Retraction to the reference plane brought forward by
the safety distance with G1 and the retraction
feedrate defined under parameter RFF
• Retraction to retraction plane with G0.
Description of parameters
See Subsection 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.
FFR (feedrate)
The feedrate value assigned to FFR is active for
boring.
RFF (retraction feedrate)
The feedrate value assigned to RFF is active for
retraction from the plane.
2-92
Z
SINUMERIK 840D/840Di/810D Programming Guide Cycles (PGZ) – 11.02 Edition
2
03.96
09.01
G0
G1
G4
RTP
RFP+SDIS
RFP
X
DP=RFP-DPR
© Siemens AG, 2002. All rights reserved