HEIDENHAIN CNC PILOT 640 - Centric Drilling Unit; Units - Centric Drilling

smart.Turn units | Units – Centric drilling
2
HEIDENHAIN | User's Manual smart.Turn and DIN Programming | 12/2017
105
2.4 Units – Centric drilling
Centric drilling unit
The unit uses stationary tools to drill axial holes in several passes.
Suitable tools can be positioned up to +/– 2 mm outside the turning
center.
Unit name: G74_ZENTR / cycle: G74
Further information: "Deep boring G74", Page 378
Cycle form:
Z1: Start point drill
Z2: End point drill
NS: Starting block no. of contour – beginning of contour
section
X: Start point drill (diameter value; range: –2 mm < X < 2 mm;
default: 0)
E: Period of dwell at end of hole (default: 0)
D: Retraction type
0: Rapid traverse
1: Feed rate
V: Feed reduction
0: Without reduction
1: At end of the hole
2: At start of the hole
3: At start & end of hole
AB: Drilling lengths (default: 0)
P: 1. Boring depth
IB: Hole depth reduct. val – value by which the hole depth
decreases after every infeed.
JB: Minimum hole depth
If you have entered a hole depth reduction value, the hole depth
is reduced only to the value entered in JB.
B: Return distance – value by which the tool is retracted after
reaching the respective hole depth
RI: Safety clearance internal – distance for reapproach inside
the hole (default: Safety clearance SCK)