Siemens SINUMERIK 808D Programming And Operating Manual page 44

Manual machining
3.4 Manual machining using cycles (functions)
You can access the "Manual center drilling" function by pressing the softkey "Drilling centric"
in the drilling cycle overview.
Alternatively, you can select "Drill. centric" with <Cursor keys> and activate with the input
key.
Figure 3-21
Parameter
Parameter
Reference z0
Drilling depth l
Max. infeed Max
Min. infeed Min
Degression factor f
Dwell time t
Return travel R
distance
Chip breaking/deswarfing
44
Drilling centric
Description
Start position for the drill hole in the longitudinal axis
(absolute position of Z axis)
Enter the depth of the drill hole to be created, taking the start position for the drill hole
("Refer. z0") as the starting point. The drilling direction is always towards the chuck and
cannot be reversed.
Maximum infeed value for the first infeed in the longitudinal axis
Minimum infeed value in the longitudinal axis, which must be observed for the final infeed.
Degression factor: the value by which the second and all subsequent infeeds in the
longitudinal axis are multiplied. The following general rule applies: An input value greater
than 1 increases the infeed depth with each infeed, an input value of less than 1 reduces it
with each infeed. To switch off degression, enter 1 (or 0) here.
Dwell time on reaching the drilling depth
Return travel distance in the longitudinal axis for chip breaking.
With this toggle field you can select between machining with "chip breaking" or
"deswarfing". With "chip breaking", on reaching the corresponding infeed depth the tool is
retracted in the longitudinal axis by a defined value (chip breaking) before the next infeed.
With "deswarfing" on the other hand, the tool is withdrawn from the drill hole on reaching the
corresponding infeed depth. The next infeed then continues as usual. The current selection
is shown as a graphic in the left-hand section of the screen.
Programming and Operating Manual, 12/2012, 6FC5398-3DP10-0BA0
Manual Machine Plus (Turning)