306 ISO Programming
4.22 Drilling and Boring Cycles
Thread milling, axial G799
G799 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 the approach radius R, mills the thread in a
rotation of 360°, while advancing by the thread pitch F. Following that,
the cycle retracts the tool and returns it to the starting point.
Example: G799
%799.nc
[G799]
N1 T9 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
Parameters
I Thread diameter
Z Starting point Z
K Thread depth
R Approach radius
F Thread pitch
J Direction of thread—(default: 0)
0: Right-hand thread
1: Left-hand thread
H Cutting direction (default: 0)
0: Up-cut milling
1: Climb milling
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 “approach
radius R.”
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