Siemens SINUMERIK 840D sl Function Manual page 768

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Punching and Nibbling (N4)

Automatic path segmentation

The axis response illustrated in the diagram above can be particularly useful when applied to

the axis of a rotatable tool in cases where it is used to place the tool in a defined direction

(e.g. tangential) in relation to the contour, but where the tangential control function must not

be applied. However, it is not a substitute for the tangential control function since the start

and end positions of the rotary axis must always be programmed.

Additional offset motions of special axes (in this case, rotary axis C) are implemented via a

zero offset.

Supplementary conditions

● If the C axis is not defined as a "Punch-nibble axis", then the C axis motion path is not

● If the functionality described above is to be implemented in a variant not specific to

segmented in block N30 in the above example nor is a stroke initiated at the block end.

nibbling applications, but with alignment of the special axis, then stroke initiation can be

suppressed by the following PLC interface signal:

DB 21, 22 DBX3.2 (stroke suppression)

(Application: e.g. alignment of electron beam during welding)

A similar response can be programmed with the following machine data setting:

MD26014 $MC_PUNCH_PATH_SPLITTING=1

In this case, the path is segmented irrespective of punching or nibbling functions.

Function Manual, 03/2009, 6FC5397-1BP10-4BA0

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Sinumerik 840de sl