Siemens SINUMERIK 828D Operating Manual page 313

Approach/retraction during stock removal
1. The tool moves with G0 to safety clearance of the reference point.
2. The tool drills with the programmed spindle speed and feedrate F = F · FD1 [%] up to the
1st infeed depth.
3. Dwell time at drilling depth DTB.
4. The tool retracts from the workpiece for the stock removal with rapid traverse to the safety
clearance.
5. Dwell time at starting point DTS.
6. Approach of the last drilling depth with G0, reduced by the clearance distance V3.
7. Drilling is then continued to the next drilling depth.
8. Steps 4 to 7 are repeated until the programmed final drilling depth Z1 is reached.
9. The tool retracts to the retraction plane at rapid traverse.
Deep-hole drilling at the entrance to the hole
The following versions are available for deep-hole drilling 2:
●
● Deep-hole drilling with pilot hole
Note
Predrilling or pilot hole mutually exclude one another.
Predrilling
For predrilling, the reduced feedrate (FA) is used up to the predrilling depth (ZA) and then
the drilling feedrate is used. When drilling with several infeed steps, the predrilling depth
must be located between the reference point and the 1st drilling depth.
Through drilling
For a through-hole, starting from the remaining drilling depth (ZD), a reduced feedrate (FD)
is used.
Pilot hole
The cycle optionally takes into account the depth of a pilot hole. This can be programmed
with abs/inc – or a multiple of the hole diameter (1.5 to 5*D is typical, for example) – and is
assumed that it is available.
If a pilot hole exists, then the 1st drilling depth must be located between the pilot hole and
the final drilling depth. The tool enters the pilot hole with reduced feedrate and reduced
speed; these values can be programmed.
Turning
Operating Manual, 01/2015, 6FC5398-8CP40-5BA2
Deep-hole drilling with/without predrilling
Programming technology functions (cycles)
9.1 Drilling
313