HEIDENHAIN iTNC 530 (340 49x-01) ISO programming - Manual (Page 240)

240 8 Programming: Cycles
8.1 W
o
rk
ing with Cy
cles
Calling a cycle with G79:G01 (CYCL CALL POS)
The G79:G01 function calls the last defined fixed cycle once. The
starting point of the cycle is the position that you defined in the
G79:G01
block.
The TNC moves using positioning logic to the position defined in the
CYCL CALL POS
block.
„ If the current position in the tool axis is greater than the top surface
of the workpiece (Q203), the iTNC moves the tool to the
programmed position first in the machining plane and then in the
tool axis.
„ If the current tool position in the tool axis is below the top surface
of the workpiece (Q203), the TNC moves the tool to the
programmed position first in the tool axis to the clearance height and
then in the working plane to the programmed position.
Cycle call with M99/89
The M99 function, which is active only in the block in which it is
programmed, calls the last defined fixed cycle once. You can program
M99
at the end of a positioning block. The TNC moves to this position
and then calls the last defined fixed cycle.
If the TNC is to execute the cycle automatically after every positioning
block, program the first cycle call with M89 (depending on machine
parameter 7440).
To cancel the effect of M89, program:
„ M99 in the positioning block in which you move to the last starting
point, or
„ G79 , or
„ Define with CYCL DEF a new fixed cycle
Three coordinate axes must always be programmed in the
G79:G01
block. With the coordinate in the tool axis you can
easily change the starting position. It serves as an
additional datum shift.
The feed rate most recently defined in the G79:G01 block
applies only for traverse to the start position programmed
in this block.
As a rule, the TNC moves without radius compensation
(R0) to the position defined in the G79:G01 block.
If you use G79:G01 to call a cycle in which a start position
is defined (for example Cycle 212), then the position
defined in the cycles serves as an additional shift on the
position defined in the G79:G01 block. You should
therefore always define the start position to be set in the
cycle as 0.