HEIDENHAIN iTNC 530 (34049x-08) Cycle programming - Manual (Page 203)

HEIDENHAIN iTNC 530 203
7.
8 SIDE FINISHING (Cy
cle 24, DIN/ISO:
G124)
7.8 SIDE FINISHING (Cycle 24,
DIN/ISO: G124)
Cycle run
The individual subcontours are approached and departed on a
tangential arc. The TNC finishes each subcontour separately.
Please note while programming:
The sum of allowance for side (Q14) and the radius of the
finish mill must be smaller than the sum of allowance for
side (Q3, Cycle 20) and the radius of the rough mill.
This calculation also holds if you run Cycle 24 without
having roughed out with Cycle 22; in this case, enter "0" for
the radius of the rough mill.
You can use Cycle 24 also for contour milling. Then you
must:
 define the contour to be milled as a single island
(without pocket limit), and
 enter the finishing allowance (Q3) in Cycle 20 to be
greater than the sum of the finishing allowance Q14 +
radius of the tool being used.
The TNC automatically calculates the starting point for
finishing. The starting point depends on the available
space in the pocket and the allowance programmed in
Cycle 20. The TNC executes the positioning logic to the
starting point of the finishing operation as follows:
approach the starting point in the working plane, then
move to depth in tool axis direction.
The starting point calculated by the TNC also depends on
the machining sequence. If you select the finishing cycle
with the GOTO key and then start the program, the
starting point can be at a different location from where it
would be if you execute the program in the defined
sequence.