Siemens SINUMERIK 840D sl Function Manual page 736

Punching and Nibbling (N4)
10.4 Automatic path segmentation
MD26016 $MC_PUNCH_PARTITION_TYPE=2
MD26016=2 is set in cases where the axis must behave as described above in linear
interpolation mode, but according to the default setting in circular interpolation mode (see 1st
case).
The axis behavior for the example is then as follows: In block N20, the C axis is rotated to
C=45° in the first sub-block. The following circular interpolation block rotates the C axis
through 15° in every sub-block.
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.
Note
Additional offset motions of special axes (in this case, rotary axis C) are implemented via a
zero offset.
736
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions