HEIDENHAIN iTNC 530 (340 49x-03) - Manual (Page 398)

398 8 Programming: Cycles
8.4 Cy
cles f
o
r Milling P
o
c
k
ets, St
uds and Slots
Finishing
4 Inasmuch as finishing allowances are defined, the TNC then
finishes the slot walls, in multiple infeeds if so specified. The slot
side is approached tangentially.
5 Then the TNC finishes the floor of the slot from the inside out.. The
slot floor is approached tangentially.
Before programming, note the following:
Pre-position the tool in the machining plane with radius
compensation R0. Define Parameter Q367 (Reference
for slot position)
appropriately.
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 CYCL CALL POS X... Y... or
in U and V if you programmed CYCL CALL POS 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.
If the slot width is greater than twice the tool diameter, the
TNC roughs the slot correspondingly from inside out. You
can therefore mill any slots with small tools, too.
The slot position 0 is not allowed if you use Cycle 254
Circular Slot in together with Cycle 221.
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!