Thread drilling/milling (cycle g264) – HEIDENHAIN iTNC 530 (340 422) ISO programming User Manual
Page 265
HEIDENHAIN iTNC 530
265
8.3 Cy
cles f
o
r Dr
illing
, T
a
p
p
ing
and
Th
read Millin
g
U
U
U
U
Workpiece surface coordinate
Q203 (absolute
value): Coordinate of the workpiece surface.
U
U
U
U
2nd set-up clearance
Q204 (incremental value):
Coordinate in the tool axis at which no collision
between tool and workpiece (clamping devices) can
occur.
U
U
U
U
Feed rate for counterboring
Q254: Traversing
speed of the tool during counterboring in mm/min.
U
U
U
U
Feed rate for milling
Q207: Traversing speed of the
tool in mm/min while milling.
THREAD DRILLING/MILLING (Cycle G264)
1
The TNC positions the tool in the tool axis at rapid traverse to the
programmed setup clearance above the workpiece surface.
Drilling
2
The tool drills to the first plunging depth at the programmed feed
rate for plunging.
3
If you have programmed chip breaking, the tool then retracts by
the entered retraction value. If you are working without chip
breaking, the tool is moved at rapid traverse to set-up clearance
and then at rapid traverse to the entered starting position above
the first plunging depth.
4
The tool then advances with another infeed at the programmed
feed rate.
5
The TNC repeats this process (2 to 4) until the programmed total
hole depth is reached.
Countersinking at front
6
The tool moves at the feed rate for pre-positioning to the sinking
depth at front.
7
The TNC positions the tool without compensation from the center
on a semicircle to the offset at front, and then follows a circular
path at the feed rate for countersinking.
8
The tool then moves on a semicircle to the hole center.
Example: NC blocks
N250 G263 THREAD MLLNG/CNTSNKG
Q335=10
;NOMINAL DIAMETER
Q239=+1.5
;PITCH
Q201=-16
;THREAD DEPTH
Q356=-20
;COUNTERSINKING DEPTH
Q253=750
;F PRE-POSITIONING
Q351=+1
;CLIMB OR UP-CUT
Q200=2
;SET-UP CLEARANCE
Q357=0.2
;CLEARANCE TO SIDE
Q358=+0
;DEPTH AT FRONT
Q359=+0
;OFFSET AT FRONT
Q203=+30
;SURFACE COORDINATE
Q204=50
;2ND SET-UP CLEARANCE
Q254=150
;F COUNTERBORING
Q207=500
;FEED RATE FOR MILLING