HEIDENHAIN iTNC 530 (340 420) ISO programming - Manual (Page 288)

288 8 Programming: Cycles
8.4 Cy
cles f
o
r Milling P
o
c
k
ets, St
uds and Slots
CIRCULAR SLOT with reciprocating plunge-cut
(Cycle G211)
Roughing process
1 At rapid traverse, the TNC positions the tool in the tool axis to the
2nd set-up clearance and subsequently to the center of the right
circle. From there, the tool is positioned to the programmed set-up
clearance above the workpiece surface.
2 The tool moves at the milling feed rate to the workpiece surface.
From there, the cutter advances—plunge-cutting obliquely into the
material—to the other end of the slot.
3 The tool then moves at a downward angle back to the starting
point, again with oblique plunge-cutting. This process (steps 2 to
3) is repeated until the programmed milling depth is reached.
4 For the purpose of face milling, the TNC moves the tool at the
milling depth to the other end of the slot.
Finishing process
5 The TNC advances the tool from the slot center tangentially to the
contour of the finished part. The tool subsequently climb mills the
contour (with M3), and if so entered, in more than one infeed. The
starting point for the finishing process is the center of the right
circle.
6 When the tool reaches the end of the contour, it departs the
contour tangentially.
7 At the end of the cycle, the tool is retracted at rapid traverse to the
set-up clearance and—if programmed—to the 2nd set-up
clearance.
X
Z
Q200
Q207
Q202
Q203
Q204
Q201
X
Y
Q217
Q216
Q248
Q245
Q219
Q244