Helical Slot Milling G798 - HEIDENHAIN CNC PILOT 640 User Manual

DIN/ISO programming | Milling cycles

Helical slot milling G798

G798 mills a helical slot from the current tool position to the Final
point X, Z. The slot width equals the diameter of the milling cutter.
Parameters:
X: Final point (diameter value)
Z: Final point
C: Start angle
F: Thread pitch
F positive: Right-hand thread
F negative: Left-hand thread
P: Run-in lgth – ramp at the beginning of the slot
K: Thread runout length – ramp at the end of the slot
U: Thread depth
I: Max. approach
E: Reducing value for infeed reduction (default: 1)
D: No.gears
Infeeds:
Max. approach I is used for the first infeed movement.
The control calculates all subsequent infeed movements as
follows: Current infeed = I * (1 – (n – 1) * E)
(n: n - nth infeed)
The infeed movement is reduced down to >= 0.5 mm.
Following that, each infeed movement will amount to 0.5 mm.
You can mill a helical slot only from the outside.
Example: G798
%798.nc
N1 T9 G197 S1200 G195 F0.2 M104
N2 M14
N3 G110 C0
N4 G0 X80 Z15
N5 G798 X80 Z-120 C0 F20 K20 U5 I1
N6 G100 Z2
N7 M15
END
HEIDENHAIN | User's Manual smart.Turn and DIN Programming | 12/2017
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