HEIDENHAIN CNC Pilot 4290 V7.1 - Manual (Page 251)

HEIDENHAIN CNC PILOT 4290 251
4.23 Dr
illing Cy
cles
Type of taps:
„ Stationary tap: Main spindle and feed drive are synchronized.
„ Driven tap: Driven tool and feed drive are synchronized.
Deep-hole drilling G74
G74 is used for axial and radial holes in several stages using driven or
stationary tools.
„ “Cycle STOP” becomes effective at the end of the
tapping operation.
„ Feed rate override is not effective.
„ Do not use spindle override!
„ Use a floating tap holder if the driven tool is not
controlled, e.g. by a ROD encoder.
Example: G74
. . .
N1 M5
N2 T4 G197 S1000 G195 F0.2 M103
N3 M14
N4 G110 C0
N5 G0 X80 Z2
N6 G74 Z-40 R2 P12 I2 B0 J8 [drilling]
N7 M15
. . .
Parameters
NS Block number of contour
„ Reference to the contour of the hole (G49-Geo, G300-Geo
or G310-Geo)
„ No input: Single hole without contour description
X End point of axial hole (diameter value)
Z End point of radial hole
P 1st hole depth
I Reduction value (default: 0)
B Retraction distance (default: to starting point of hole)
J Minimum hole depth (default: 1/10 of P)
E Period of dwell for chip breaking at end of hole (in seconds)—
(default: 0)
V Feed rate reduction (50 %)—(default: 0)
„ V=0 or 2: Reduction at start
„ V=1 or 3: Reduction at start and end
„ V=4: Reduction at end
„ V=5: No reduction
D Retraction speed and infeed within the hole (default: 0)
„ D=0: Rapid traverse
„ D=1: Feed rate
K Retraction plane (radial holes: diameter)—(default: to starting
position or to safety clearance)
H1 As of software version 625 952-04:
Spindle brake (H1 is evaluated if the brake is entered in
machine parameter 1019, ..)—default: 0
„ 0: Activate the spindle brake
„ 1: Deactivate the spindle brake