Deep Hole Drilling With Chip Breaking (Vari=0) - Siemens SINUMERIK 840D Programming Manual

Drilling Cycles and Drilling Patterns
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2.1 Drilling cycles

Deep hole drilling with chip breaking (VARI=0):

• Approach of the reference plane brought forward
by the safety clearance with G0
• Traverse to the first drilling depth with G1, the
feedrate for which is derived from the feedrate
defined with the program call which is subject to
parameter FRF (feedrate factor)
• Dwell time at final drilling depth (parameter DTB)
• Retraction by 1 mm from the current drilling depth
with G1 and the feedrate programmed in the
calling program (for chip breaking)
• Traverse to next drilling depth with G1 and the
programmed feedrate (sequence of motions is
continued until the final drilling depth is reached)
• Retraction to retraction plane with G0
Description of parameters
See Section 2.1.2. (Drilling, Centering – CYCLE81)
for a description of parameters RTP, RFP, SDIS,
DP, DPR
FDEP and DAM (final drilling depth_1, abs and
degression value)
DAM=0 no degression
DAM>0 degression as value
The current depth is derived in the cycle as follows:
• In the first step, the depth parameterized with the
first drilling depth is traversed as long as it does not
exceed the total drilling depth.
• From the second drilling depth on, the drilling stroke
is obtained by subtracting the amount of degression
from the stroke of the last drilling depth, provided
that the latter is greater than the programmed
amount of degression.
• The next drilling strokes correspond to the amount of
degression, as long as the remaining depth is
greater than twice the amount of degression.
• The last two drilling strokes are divided equally and
traversed and are therefore always greater than half
of the amount of degression.
2-60
Z
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide, Cycles (PGZ) - 04.00 Edition
03.96
04.00
G1
G0
G4
RTP
RFP+SDIS
RFP
X
FDEP
DP = RFP-DPR
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