Siemens SINUMERIK 828D Turning, Руководство по эксплуатации

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Deep-hole drilling at the entrance to the hole
The following versions are available for deep-hole drilling 2:
● Deep-hole drilling with/without predrilling
● 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. For drilling with several infeed steps, the predrilling depth must be
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, the 1st drilling depth must be 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.
Direction of spindle rotation
The direction of spindle rotation with which the tool enters and withdraws from the pilot hole
can be programmed as follows:
● with stationary spindle
● with clockwise rotating spindle
● with counterclockwise rotating spindle
This avoids long or thin drills from being broken.
Horizontal drilling
For horizontal drilling using spiral drills, entering the pilot hole is improved if the cutting edges
of the drill are also in the horizontal position. To support this, the alignment of the drill in the
spindle can be programmed for a specific position (SPOS).
The feedrate is stopped before reaching the pilot hole depth, the speed increased to the drilling
speed and the coolant switched in.
Programming technological functions (cycles)
10.1 Drilling
Milling
Operating Manual, 08/2018, 6FC5398-7CP41-0BA0
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