Siemens SINUMERIK User Manual page 159

● 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 and traversed equally and are therefore always greater than half of the amount of
degression.
● If the value for the first drilling depth is incompatible with the total depth, the error message 61107 "First drilling depth
defined incorrectly" is output and the cycle is not executed.
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).
•
AXN (tool axis)
By programming the drilling axis via AXN, it is possible to omit the switchover from plane G18 to G17 when the deep-hole
drilling cycle is used on turning machines.
The identifiers have the following meanings:
AXN=1
First axis of the current plane
AXN=2
Second axis of the current plane
AXN=3
Third axis of the current plane
For example, to machine a center hole (in Z) in the G18 plane, you program:
G18
AXN=1
MDEP (minimum drilling depth)
You can define a minimum drilling depth for drill stroke calculations based on a degression factor. If the calculated drilling
stroke becomes shorter than the minimum drilling depth, the remaining depth is machined in strokes equaling the length of
the minimum drilling depth.
VRT (variable retraction value for chip breakage with VARI=0)
You can program the retraction path for chip breaking.
DTD (dwell time at final drilling depth)
The dwell time at final drilling depth can be entered in seconds or revolutions.
DIS1 (programmable limit distance for VARI=1)
The limit distance after re-insertion in the hole can be programmed.
Programming and Operating Manual (Turning)
01/2017
159