HEIDENHAIN SW 54843x-02 DIN Programming - Manual (Page 319)

HEIDENHAIN MANUALplus 620, CNC PILOT 640 319
4.22 Dr
illing cy
cles
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 radial hole (diameter value)
ZS Starting point of axial hole
XE End point radial hole (diameter value)
ZE End point of axial hole
K Boring depth (hole depth) (alternative to XE/ZE)
P First 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)
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 Retraction 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