HEIDENHAIN CNC Pilot 4290 V7.1 - Manual (Page 247)

HEIDENHAIN CNC PILOT 4290 247
4.23 Dr
illing Cy
cles
Feed rate reduction factor:
„ Indexable insert drill and twist drill with 180° drilling angle
„ Beginning of hole: No reed rate reduction (even with V=0 or V=1)
„ End of hole: Reduction as of hole end point – 2*safety clearance
„ Other drills
„ Beginning of hole: Feed rate reduction as programmed in V
„ End of hole: Reduction as of hole end point – length of first cut –
safety clearance
„ Length of first cut = tool tip
„ Safety clearance: see machining parameter 9 “Drilling” or G47,
G147).
„ Single hole without contour description: Program X or Z
as alternative.
„ Hole with contour description: Do not program X, Z.
„ Hole pattern: NS refers to the hole contour, and not the
definition of the pattern.
Cycle run
1 „ Hole without contour definition: Tool is located at the
starting point (safety distance from the bore hole).
„ Hole with contour description: Tool moves at rapid traverse
to the starting point:
„ K not programmed: Moves up to the safety clearance
„ K programmed: Moves to the position K and then to the
safety clearance
2 Spot drilling. Feed rate reduction depending on V
3 Drilling at feed rate.
4 Through drilling. Feed rate reduction depending on V
5 Retract depending on D at rapid traverse or feed rate.
6 Retraction position:
„ K not programmed: Retraction to the starting point
„ K programmed: Retraction to the position K