HEIDENHAIN SW 54843x-02 DIN Programming - Manual (Page 90)

90 smart.Turn units
2.5 Units—Dr
illing in C axis
SCK Safety clearance in infeed direction: Safety clearance in
infeed direction during drilling and milling operations.
BP Break duration: Time span for interruption of the feed for
chip breaking.
BF Feed duration: Time interval until the next break. The
interruption of the feed rate breaks the chip.
Further forms: see page 56