64 smart.Turn Units
2.4 Units—Centric Drilling
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 (see page 299)
Access to the technology database:
Machining operation: Drilling
Affected parameters: F, S
Pattern form
X Start point drill (starting point of hole; diameter value)—
(range: –2 mm < X < 2 mm; default: 0)
APP Approach: see page 51
DEP Departure: see page 51
Cycle form
Z1 Start point drill (starting point of hole)
Z2 End point drill (end point of hole)
E Delay (dwell time at end of hole) (default: 0)
D Retraction at
0: Rapid traverse
1: Feed rate
V Feed rate reduction
0: Without reduction
1: At end of the hole
2: At start of the hole
3: At start and end of the hole
AB Spot drilling / through drilling length (distance for feed rate
reduction)
P 1st hole depth (1st drilling depth)
IB Hole depth reduction value
JB Minimum hole depth
B Retraction distance
RI Internal safety clearance: Distance for reapproach inside
the hole (default: safety clearance SCK).
Further forms: see page 46
If X is not programmed or XS is in the range of –2 mm < XS
< 2 mm, then the MANUALplus drills at XS.
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