HEIDENHAIN SW 548328-05 - Manual (Page 291)

HEIDENHAIN MANUALplus 620 291
4.7 Dr
illing cy
cles
Operating mode for technology database access depends on the tool
type:
 Twist drill: Boring and drilling
 Boring bar with indexable inserts: Pilot drilling
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 X1
3 First pass (pecking depth: P)—drill with reduced feed rate, if
defined
4 Retract by retraction length B—or to the hole starting point
and advance again to last pecking depth minus safety clearance
5 Next pass (pecking depth: "last depth – IB" or JB).
6 Repeat 4 to 5 until hole end point X2 is reached
7 Last drilling pass—depending on spot and through-drilling
variant V
:
 Through-drilling reduction:
– Drill at programmed feed rate to position X2 – AB
– Drill at reduced feed rate to hole end point X2
 No through drilling reduction:
– Drill at programmed feed rate to hole end point X2
– Remain at end of hole for dwell time E, if defined
8 Retract
 If X1 is programmed, to hole starting point X1
 If X1 is not programmed, to starting point X
9 Move to the tool change point according to the G14 setting
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.