HEIDENHAIN SW 54843x-02 DIN Programming - Manual (Page 163)

HEIDENHAIN MANUALplus 620, CNC PILOT 640 163
3.2 Units—Pr
e
dr
illing in Y axis
3.2 Units—Predrilling in Y axis
"Predrill, contour 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 milling contour consists of multiple sections, the
unit machines a hole for each section.
Unit name: DRILL_STI_840_Y / Cycles: G840 A1 (see page 347); G71
(see page 313)
Access to the technology database:
 Machining operation: Drilling
 Affected parameters: F, S
Parameters on the Contour form
FK
see page 58
NS Starting block no. of contour
NE End block no. of contour
Z1 Milling top edge
P2 Depth of contour
Parameters on the Cycle form
JK
Cutter position
 0: On the contour
 1, closed contour: Within the contour
 1, open contour: Left of the contour
 2, closed contour: Outside the contour
 2, open contour: Right of the contour
 3: Depending on H and MD
H Cutting direction
 0: Up-cut milling
 1: Climb milling
I Contour-parallel oversize
K Infeed-direction oversize
R Approach radius
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: 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)
RB Return plane (default: return to the starting position or to
the safety clearance)
Further forms: see page 56