Siemens sinumerik 808d Programming And Operating Manual page 126

Cycles
2.4 Drilling cycles
Deep-hole tapping: VARI, DAM, VRT
With the VARI parameter, it is possible to distinguish between simple tapping (VARI = 0) and
deep-hole tapping (VARI ≠ 0).
In conjunction with deep-hole tapping, it is possible to choose between chip breaking
(retraction by variable distance from current drilling depth, parameter VRT, VARI = 1) and
chip removal (withdrawal from reference plane VARI = 2). These functions work analogously
to the normal deep-hole drilling cycle CYCLE83.
The incremental drilling depth for one pass is specified via parameter DAM. The cycle
internally calculates the intermediate depth as follows:
● The programmed incremental drilling depth is executed in each step until the rest up to
● The remaining drilling depth is halved and executed in two steps. Thus, the minimum
Note
The direction of rotation when tapping in the cycle is always reversed automatically.
Programming example1: Rigid tapping
A thread is tapped without compensating chuck at position X30 Y35 in the XY plane; the
tapping axis is the Z axis. No dwell time is programmed; the depth is programmed as a
relative value. The parameters for the direction of rotation and for the lead must be assigned
values. A metric thread M5 is tapped.
N10 G0 G90 T11 D1
N20 G17 X30 Y35 Z40
N30 CYCLE84(40, 36, 2, , 30, , 3, 5, , 90, 200,
500,)
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the final drilling depth is less than (<) 2 x DAM
drilling depth is not smaller than DAM / 2.
; Specification of technology
values
; Approach drilling position
Cycle call; parameter PIT has
been omitted; no value is entered
for the absolute depth or the
dwell time; spindle stop at 90
degrees; speed for tapping is
Turning Part 2: Programming (Siemens instructions)
Programming and Operating Manual, 05/2012, 6FC5398-5DP10-0BA0