HEIDENHAIN MANUALplus 4110 - Manual (Page 358)

358 6 DIN Programming
6.1
8
Dr
illing Cy
cles
Thread milling, axial G799
The cycle mills a thread in existing holes.
Place the tool on the center of the hole before calling G799. The cycle
positions the tool on the end point of the thread within the hole. The
tool then approaches on "approaching radius R," mills the thread in a
rotation of 360°, while advancing by "F." Following that, the cycle
retracts the tool and returns it to the starting point.
Parameters
 I inside diameter of thread
 Z starting point of thread
 K thread depth
 R approaching radius —default:
R = (I – milling diameter) / 2
 F thread pitch
 J left-hand, right-hand (default: 0): Direction of thread
„ J=0: Right-hand
„ J=1: Left-hand
 H cutting direction (default: 0)
„ H=0: Up-cut milling
„ H=1: Climb milling
Example: G799
%799.nc
[G799]
N1 T70 G195 F0.2 G197 S800
N2 G0 X100 Z2
N3 M14
N4 G110 Z2 C45 X100
N5 G799 I12 Z0 K-20 F2 J0 H0
N6 M15
END
Use thread-milling tools for cycle G799.
Danger of collision!
Be sure to consider the hole diameter and the diameter of
the milling cutter when programming "approaching radius
R."