HEIDENHAIN iTNC 530 (340 49x-01) ISO programming - Manual (Page 298)

298 8 Programming: Cycles
8.4 Cy
cles f
o
r Milling P
o
c
k
ets, St
uds and Slots
Finishing
5 Inasmuch as finishing allowances are defined, the TNC then
finishes the pocket walls, in multiple infeeds if so specified. The
pocket wall is approached tangentially.
6 Then the TNC finishes the floor of the pocket from the inside out.
The pocket floor is approached tangentially.
Before programming, note the following:
Pre-position the tool in the machining plane to the starting
position with radius compensation R0. Note Parameter
Q367 (pocket position).
The TNC runs the cycle in the axes (machining plane) with
which you approached the starting position. For example,
in X and Y if you programmed G79:G01 X... Y... or in U
and V if you programmed G79:G01 U... V...
The TNC automatically pre-positions the tool in the tool
axis. Note Parameter Q204 (2nd set-up clearance).
The algebraic sign for the cycle parameter DEPTH
determines the working direction. If you program
DEPTH = 0, the cycle will not be executed.
At the end of the cycle, the TNC returns the tool to the
starting position.
At the end of a roughing operation, the TNC positions the
tool back to the pocket center at rapid traverse. The tool is
above the current pecking depth by the setup clearance.
Enter the setup clearance so that the tool cannot jam
because of chips.
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!