HEIDENHAIN TNC 426, User Manual

Page: 230 / 502

204 8 Programming: Cycles
8.1 W
o
rk
ing with Cy
cles
Calling a cycle
The following cycles become effective automatically as soon as they
are defined in the part program. These cycles cannot and must not be
called:
n
Cycle 220 for circular and Cycle 221 for linear hole patterns
n
SL Cycle 14 CONTOUR GEOMETRY
n
SL Cycle 20 CONTOUR DATA
n
Cycle 32 TOLERANCE
n
Coordinate transformation cycles
n
Cycle 9 DWELL TIME
All other cycles are called as described below:
1 If the TNC is to execute the cycle once after the last programmed
block, program the cycle call with the miscellaneous function M99
or with CYCL CALL:
U To program the cycle call, press the CYCL CALL key.
U Press the CYCL CALL M soft key to enter a cycle call.
U Enter a miscellaneous function M or press END to end
the dialog.
2 If the TNC is to execute the cycle automatically after every
positioning block, program the cycle call with M89 (depending on
machine parameter 7440).
3 If the TNC is to execute the cycle at every position that is defined
in a point table, use the function
CYCL CALL. (see “Point Tables”
on page 206)
To cancel M89, enter
n
M99 or
n
CYCL CALL or
n
CYCL DEF
Prerequisites
The following data must always be programmed before a
cycle call
n
BLK FORM for graphic display (needed only for test
graphics)
n
Tool call
n
Direction of spindle rotation (M functions M3/M4)
n
Cycle definition (CYCL DEF).
For some cycles, additional prerequisites must be
observed. They are described with the individual cycle.