HEIDENHAIN MANUALplus 620 299
4.22 Drilling and Boring Cycles
Deep-hole drilling G74
G74 is used for axial and radial holes in several stages using driven or
stationary tools.
Example: G74
. . .
N1 M5
N2 T4 G197 S1000 G195 F0.2 M103
N3 M14
N4 G110 C0
N5 G0 X80 Z2
N6 G745 XK0 YK0 Z2 K80 Wi90 Q4 V2
N7 G74 Z-40 R2 P12 I2 B0 J8 [drilling]
N8 M15
. . .
Parameters
ID Drilling contour—Name of the hole definition
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
XS Starting point of axial hole (diameter value)
ZS Starting point of radial hole
XE Final point of axial hole (diameter value)
ZE Final point of radial hole
K Boring depth (hole depth) (alternative to XE/ZE)
P 1st hole depth (1st drilling depth)
I Reduction value (default: 0)
B Retraction distance (default: to starting point of hole)
J Minimum hole depth (default: 1/10 of P)
R Safety distance (inside)
A Drilling lengths—(default: 0)
V Bore (through-drilling) variant (feed rate reduction 50%)—
(default: 0)
0: No feed rate reduction
1: Feed reduction for through-drilling
2: Feed reduction for pre-drilling
3: Feed reduction for pre-drilling and through-drilling
RB Return plane (radial holes: diameter)—(default: to starting
position or to safety clearance)
E Period of dwell for chip breaking at end of hole (in seconds)—
(default: 0)
D Retraction speed and infeed within the hole (default: 0)
0: Rapid traverse
1: Feed rate
BS Start element no. (number of the first hole to be machined in
a pattern)
BE End element no. (number of the last hole to be machined in a
pattern)
H (Spindle) Brake off (default: 0)
0: Spindle brake on
1: Spindle brake off
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