HEIDENHAIN CNC Pilot 4290 - Manual (Page 311)

HEIDENHAIN CNC PILOT 4290 299
6.12.6 Drilling
Overview of drilling operations
■ Centric predrilling (G74)
■ Centering (G72)
■ Drilling (G71 or G74)
■ Countersinking (G72)
■ Counterboring (G72)
■ Reaming (G71)
■ Tapping (G73)
■ Special drilling
■ Centering and countersinking (G72)
■ Drilling and countersinking (G72)
■ Drilling and threading (G73)
■ Drilling and reaming (G71 or G74)
■ Drilling automatic – accounts for form elements, bore holes, single
holes and hole patterns.
”Feed rate reduction” soft keys
Feed rate reduction for through drilling
Feed rate reduction for blind drilling
Feed rate reduction for blind drilling with
boring bars and twist drills with 180°
drilling angle
Position the drill with ”Cycle – Approach”
to the turning center.
Centric predrilling – Automatic
”Centric predrilling - Automatic” performs the complete predrilling
operation, including tool changes that might be necessary because of
different diameters.
6.12 Int
er
activ
e
W
o
rking Plan Gener
ation (IWG)
Centric predrilling (G74)
Predrilling at the turning center with stationary tools.
Selecting the machining range
Select all contour elements encompassing the bore hole. If required,
the bore hole can be limited with ”drilling limitation Z.”
Parameters
Z:
Drilling limitation
S: Safety clearance – generates ”safety clearance G47” before
the drilling cycle
yP: 1st drilling depth
J: Minimum drilling depth
I: Reduction value
B: Return distance – default: Retract to starting point of hole
E: Period of dwell (for chip breaking at end of hole)