Operation Manual

HEIDENHAIN MANUALplus 620 291
4.7 Drilling cycles
Operating mode for technology database access depends on the tool
type:
 Twist drill: Boring and drilling
 Boring bar with indexable inserts: Pilot drilling
BP Break duration: Time span for interruption of the feed. The
chip is broken by the (intermittent) interruption of the feed.
BF Feed duration: Time interval until the next break. The chip
is broken by the (intermittent) interruption of the feed.
MT M after T: M function that is executed after the tool call T
MFS M at beginning: M function that is executed at the
beginning of the machining step
MFE M at end: M function that is executed at the end of the
machining step
WP Displays which workpiece spindle is used to process the
cycle (machine-dependent)
 Main drive
 Opposing spindle for rear-face machining
 If "AB" and "V" are programmed, the feed rate is reduced
by 50 % during both pre-drilling and through-boring.
 The MANUALplus uses the tool parameter driven tool
to determine whether the programmed spindle speed
and feed rate apply to the spindle or the driven tool.