Siemens SINUMERIK Series Operating Manual page 386

Programming technological functions (cycles)
10.1 Drilling
Soft first cut into the material
The entry into the material can be influenced, depending on the tool and the material.
The soft first cut comprises two partial distances:
● The first cut feedrate is maintained to a programmable first feed distance ZS1.
● An additional programmable feed distance ZS2 immediately following ZS1 is used to
continuously increase the first cut feedrate (with FLIN) to the drilling feedrate.
With chip breaking / swarf removal, this mechanism takes effect at each infeed.
The input parameters ZS1 and ZS2 are maximum values that are limited by the cycle to the
infeed depth to be executed.
Deep-hole drilling at the exit from the hole
It makes sense to reduce the feedrate when for through drilling the exit is inclined with respect
to the tool axis.
● Through drilling "no"
The machining feedrate is used when drilling to the final drilling depth. You then have the
option of programming a dwell time at the drilling depth.
● Through drilling "yes"
Up to the remaining drilling depth, you program drilling with the drilling feedrate and, from
that point onward, you program drilling with a special feedrate FD.
Retraction
Retraction can be realized at the pilot hole depth or the retraction plane.
● Retraction to the retraction plane is realized with G0 or feedrate, programmable speed as
well as direction of rotation respectively stationary spindle.
● For retraction at the pilot hole depth, subsequent retraction and insertion are performed
with the same data.
Note
Direction of spindle rotation
The direction of spindle rotation is not reversed; however, where necessary, can be stopped.
Coolant
The technology and tools require that also in the G code, the control for the coolant is
supported.
● Coolant on
Switch on at Z0 + safety clearance or at the pilot hole depth (if a pilot hole is being used)
● Coolant off
● Programming in the G code
An executable block (M command or subprogram call), which can be programmed as string.
386
Always switch off at the final drilling depth
Operating Manual, 08/2018, 6FC5398-7CP41-0BA0
Milling