Siemens sinumerik 808d Programming And Operating Manual page 121

Explanation of the parameters
For an explanation of the parameters RTP, RFP, SDIS, DP, and DPR, refer to the topic
"Drilling, centering - CYCLE81 (Page 112)".
Interrelation of the parameters DP (or DPR), FDEP (or FDPR) and DAM
The intermediate drilling depth are calculated in the cycle on the basis of final drilling depth,
first drilling depth and amount of degression as follows:
● In the first step, the depth parameterized with the first drilling depth is traversed as long
● From the second drilling depth on, the drilling stroke is obtained by subtracting the
● The next drilling strokes correspond to the amount of degression, as long as the
● The last two drilling strokes are divided and traversed equally and are therefore always
● If the value for the first drilling depth is incompatible with the total depth, the error
The FDPR parameter has the same effect in the cycle as the DPR parameter. If the values
for the reference and retraction planes are identical, the first drilling depth can be defined as
a relative value.
If the first drilling depth is programmed larger than the final drilling depth, the final drilling
depth is never exceeded. The cycle will reduce the first drilling depth automatically as far as
the final drilling depth is reached when drilling only once, and will therefore drill only once.
DTB (dwell time)
The dwell time to the final drilling depth (chip breakage) is programmed under DTB in
seconds.
DTS (dwell time)
The dwell time at the starting point is only performed if VARI=1 (chip removal).
FRF (feedrate factor)
With this parameter, you can enter a reduction factor for the active feedrate which only
applies to the approach to the first drilling depth in the cycle.
VARI (machining type)
If parameter VARI=0 is set, the drill retracts 1 mm after reaching each drilling depth for chip
breaking. If VARI=1 (for chip removal), the drill traverses in each case to the reference plane
shifted by the amount of the safety clearance.
Note
The anticipation distance is calculated internally in the cycle as follows:
• If the drilling depth is 30 mm, the value of the anticipation distance is always 0.6 mm.
• For larger drilling depths, the formula drilling depth /50 is used (maximum value 7 mm).
Turning Part 2: Programming (Siemens instructions)
Programming and Operating Manual, 05/2012, 6FC5398-5DP10-0BA0
as it does not exceed the total drilling depth.
amount of degression from the stroke of the last drilling depth, provided that the latter is
greater than the programmed amount of degression.
remaining depth is greater than twice the amount of degression.
greater than half of the amount of degression.
message 61107 "First drilling depth defined incorrectly" is output and the cycle is not
executed.
Cycles
2.4 Drilling cycles
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