Operation Manual

HEIDENHAIN CNC PILOT 640 301
4.7 Drilling cycles
Operating mode for technology database access depends on the tool
type:
 Twist drill: Drilling
 Indexable insert drill: Predrilling
Cycle run
1 Position spindle to spindle angle C (in Manual mode, machining
starts from the current spindle angle)
2 If defined, move at rapid traverse to hole starting point Z1
3 If defined, spot drill at reduced feed rate
4 Depending on through drilling variants V:
 Through-drilling reduction:
– Drill at programmed feed rate to position Z2 – AB
– Drill at reduced feed rate to hole end point Z2
 No through drilling reduction:
– Drill at programmed feed rate to hole end point Z2
– Remain at end of hole for dwell time E, if defined
5 Retract
 If Z1 is programmed, to hole starting point Z1
 If Z1 is not programmed, to starting point Z
6 Move to the tool change point according to the G14 setting
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 CNC PILOT uses the tool parameter driven tool to
determine whether the programmed spindle speed and
feed rate apply to the spindle or the driven tool.