HEIDENHAIN TNC 426B (280 472) ISO programming - Manual (Page 188)

8 Programming: Cycles 172
POCKET FINISHING (Cycle G212)
1 The TNC automatically moves the tool in the tool axis to set-up
clearance, or — if programmed — to the 2nd set-up clearance,
and subsequently to the center of the pocket.
2 From the pocket center, the tool moves in the working plane to
the starting point for machining. The TNC takes the allowance and
tool radius into account for calculating the starting point. If
necessary, the TNC plunge-cuts into the pocket center.
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 After this, the tool departs the contour tangentially 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 in rapid traverse
to set-up clearance, or - if programmed - to the
2nd set-up clearance, and finally to the center of the pocket (end
position = starting position).
Before programming, note the following:
The algebraic sign for the depth parameter determines
the working direction.
If you want to clear and finish the pocket with the same
tool, use a center-cut end mill (ISO 1641) and enter a low
feed rate for plunging.
Minimum size of the pocket: 3 times the tool radius.
8.4 Cy
cles f
or Milling P
o
c
k
ets,
St
uds and Slots
Kkap8.pm6 29.06.2006, 08:06 172