HEIDENHAIN SW 54843x-02 DIN Programming - Manual (Page 131)

HEIDENHAIN MANUALplus 620, CNC PILOT 640 131
2.9 Units—Milling, f
a
ce
"Thread milling" unit
The unit 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. Then
the tool approaches on "approaching radius R" and mills the thread.
During this, the tool advances by the thread pitch F. Following that, the
cycle retracts the tool and returns it to the starting point. With
parameter V, you can program whether the thread is to be milled in
one rotation or, with single-point tools, in several rotations.
Unit name: G799_Gewindefr_C / Cycle: G799 (see page 326)
Access to the technology database:
 Machining operation: Finish-milling
 Affected parameters: F, S
Position form
Z1
Start point drill (starting point of hole)
P2 Thread depth
I Thread diameter
F1 Thread pitch
Cycle form
J
Direction of thread
 0: Right-hand thread
 1: Left-hand thread
H Cutting direction
 0: Up-cut milling
 1: Climb milling
V Milling method
 0: The thread is milled in a 360-degree helix
 1: The thread is milled in several helical paths (single-
point tool)
R Approach radius
Further forms: see page 56