HEIDENHAIN iTNC 530 (340 49x-04) ISO programming - Manual (Page 431)

HEIDENHAIN iTNC 530 431
8.7 SL Cy
cles with Cont
our F
o
rm
ula
Characteristics of the fixed cycles
„ The TNC automatically positions the tool to the set-up clearance
before a cycle.
„ Each level of infeed depth is milled without interruptions since the
cutter traverses around islands instead of over them.
„ The radius of “inside corners” can be programmed—the tool keeps
moving to prevent surface blemishes at inside corners (this applies
for the outermost pass in the Rough-out and Side Finishing cycles).
„ The contour is approached in a tangential arc for side finishing.
„ For floor finishing, the tool again approaches the workpiece on a
tangential arc (for tool axis Z, for example, the arc may be in the Z/X
plane).
„ The contour is machined throughout in either climb or up-cut milling.
The machining data (such as milling depth, finishing allowance and
setup clearance) are entered as CONTOUR DATA in Cycle G120.
Selecting a program with contour definitions
With the %:CNT function you select a program with contour definitions,
from which the TNC takes the contour descriptions:
 Press the PGM CALL key to select the functions for
program call.
 Press the MARK KONTUR soft key.
 Enter the full name of the program with the contour
definition and confirm with the END key.
With MP7420 you can determine where the tool is
positioned at the end of Cycles G121 to G124.
Program a %:CNT block before the SL Cycles. Cycle 14
CONTOUR GEOMETRY is no longer necessary if you use
%:CNT.