HEIDENHAIN iTNC 530 (340 422) ISO programming - Manual (Page 304)

304 8 Programming: Cycles
8.4 Cy
cles f
o
r Mil
ling P
o
c
k
e
ts, St
ud
s an
d Slo
ts
STUD FINISHING (Cycle G213)
1 The TNC moves the tool in the tool axis to the set-up clearance,
or—if programmed—to the 2nd set-up clearance, and
subsequently to the center of the stud.
2 From the stud center, the tool moves in the working plane to the
starting point for machining. The starting point lies to the right of
the stud by a distance approx. 3 times the tool radius.
3 If the tool is at the 2nd set-up clearance, it moves in rapid traverse
to set-up clearance, and from there advances to the first plunging
depth at the feed rate for plunging.
4 The tool then moves tangentially to the contour of the finished part
and, using climb milling, machines one revolution.
5 The tool then departs the contour on a tangential path and returns
to the starting point in the working plane.
6 This process (3 to 5) is repeated until the programmed depth is
reached.
7 At the end of the cycle, the TNC retracts the tool at rapid traverse
to the set-up clearance, or—if programmed—to the 2nd set-up
clearance, and finally to the center of the stud (end position =
starting position).
X
Y
X
Z
Q200
Q201
Q206
Q203
Q204
Q202
X
Y
Q219
Q218
Q217
Q216
Q207
Q221
Q220
Before programming, note the following:
The TNC automatically pre-positions the tool in the tool
axis and working plane.
The algebraic sign for the cycle parameter DEPTH
determines the working direction. If you program
DEPTH = 0, the cycle will not be executed.
If you want to clear and finish the stud with the same tool,
use a center-cut end mill (ISO 1641) and enter a low feed
rate for plunging.
Enter in MP7441 bit 2 whether the TNC should output an
error message (bit 2=1) or not (bit 2=0) if a positive depth
is entered.
Danger of collision!
Keep in mind that the TNC reverses the calculation for pre-
positioning when a positive depth is entered. This
means that the tool moves at rapid traverse in the tool axis
at safety clearance below the workpiece surface!