HEIDENHAIN TNC 426 B User Manual page 168

Calling the Cycle
Prerequisites
The following data must always be programmed before
a cycle call
BLK FORM for graphic display (needed only for
test graphics)
Tool call
Direction of spindle rotation (M functions M3/M4)
Cycle definition (CYCL DEF).
For some cycles, additional prerequisites must be
observed. They are described with the individual 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:
Cycles for circular and linear hole patterns
SL cycle CONTOUR GEOMETRY
SL cycle CONTOUR DATA
Cycle 32 TOLERANCE
Coordinate transformation cycles
DWELL TIME cycle
All other cycles are called as described below.
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:
To program the cycle call, press the CYCL CALL key.
Enter a miscellaneous function, for example for
coolant supply.
If the TNC is to execute the cycle automatically after every
positioning block, program the cycle call with M89 (depending on
machine parameter 7440).
To cancel M89, enter
M99 or
CYCL CALL or
CYCL DEF
HEIDENHAIN TNC 426 B, TNC 430
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Working with the secondary axes U/V/W
The TNC performs infeed movements in the axis
that was defined in the TOOL CALL block as the
spindle axis. It performs movements in the working
plane only in the principle axes X, Y or Z. Exceptions:
You program secondary axes for the side lengths
in cycles 3 SLOT MILLING and 4 POCKET
MILLING.
You program secondary axes in the contour
geometry subprogram of an SL cycle.
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