Siemens SINUMERIK Series Operating Manual page 385

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Deep-hole drilling at the entrance to the hole

The following versions are available for deep-hole drilling 2:

Predrilling or pilot hole mutually exclude one another.

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

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.

Operating Manual, 08/2018, 6FC5398-7CP41-0BA0

Deep-hole drilling with/without predrilling

Deep-hole drilling with pilot hole

Programming technological functions (cycles)

10.1 Drilling