HEIDENHAIN iTNC 530 (340 49x-02) ISO programming - Manual (Page 302)

302 8 Programming: Cycles
8.3 Cy
cles f
o
r Dr
illing, T
a
pping and Thr
ead Milling
THREAD MILLING/COUNTERSINKING
(Cycle G263)
1 The TNC positions the tool in the tool axis at rapid traverse to the
input set-up clearance above the workpiece surface.
Countersinking
2 The tool moves at the feed rate for pre-positioning to the
countersinking depth minus the set-up clearance, and then at the
feed rate for countersinking to the countersinking depth.
3 If a safety clearance to the side has been entered, the TNC
immediately positions the tool at the feed rate for pre-positioning
to the countersinking depth.
4 Then, depending on the available space, the TNC makes a
tangential approach to the core diameter, either tangentially from
the center or with a pre-positioning move to the side, and follows
a circular path.
Countersinking at front
5 The tool moves at the feed rate for pre-positioning to the sinking
depth at front.
6 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.
7 The tool then moves in a semicircle to the hole center.