HEIDENHAIN MANUALplus 620 149
3.2 Units—Predrilling in Y axis
"Predrill, pocket mill, ICP in XY plane" unit
The unit determines the hole position and machines the hole. The
subsequent milling cycle obtains the hole position from the reference
stored in NF. If the pocket consists of multiple sections, the unit
machines a hole for each section.
Unit name: DRILL_STI_845_Y / Cycles: G845 A1 (see page 338); G71
(see page 293)
Access to the technology database:
Machining mode: Drilling
Affected parameters: F, S
Parameters on the Contour form
FK see page 48
Z1 Milling top edge
P2 Depth of contour
APP Approach: see page 51
DEP Departure: see page 51
Parameters on the Cycle form
JT Machining direction:
0: From the inside out (from the inside towards the
outside)
1: From the outside in (from the outside towards the
inside)
H Cutting direction
0: Up-cut milling
1: Climb milling
I Contour-parallel oversize
K Infeed-direction oversize
U Overlap factor (default: 0.5)
WB Cutter diameter
NF Position mark
E Delay (dwell time at end of hole) (default: 0)
D Retraction at
0: Rapid traverse
1: Feed rate
V Feed rate reduction
0: No reduction
1: At the end of the hole
2: At the beginning of the hole
3: At the beginning and end of the hole
AB Spot drilling / through drilling length (distance for feed rate
reduction)
RB Return plane (default: return to the starting position or to
the safety clearance)
Further forms: see page 46
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