HEIDENHAIN iTNC 530 (34049x-08) Cycle programming - Manual (Page 155)

HEIDENHAIN iTNC 530 155
5.4 SL
O
T
MILLING (Cy
cle 253, DIN/ISO:
G253)
Please note while programming:
With an inactive tool table you must always plunge
vertically (Q366=0) because you cannot define a plunging
angle.
Pre-position the tool in the machining plane to the starting
position with radius compensation R0. Note parameter
Q367 (slot 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 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).
At the end of the cycle the TNC merely moves the tool in
working plane back to the center of the slot; in the other
working plane axis the TNC does not do any positioning. If
you define a slot position not equal to 0, then the TNC only
positions the tool in the tool axis to the 2nd set-up
clearance. Prior to a new cycle call, move the tool back to
the starting position or program always absolute traverse
motions after the cycle call.
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.
Danger of collision!
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.
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
to set-up clearance below the workpiece surface!
If you call the cycle with machining operation 2 (only
finishing), then the TNC positions the tool to the first
plunging depth at rapid traverse!