Technical Manual TNC 360 - heidenhain - DR. JOHANNES ...

4.4.3 Rigid tapping
Tapping without a floating tap holder is defined in the NC program by "CYCL DEF 17 RIGID
TAPPING" and called by CYCL CALL . Here too the dynamic behavior is determined by machine
parameters.
Before tapping, the axes (e.g. Z and S) are synchronized by a spindle orientation, i.e. each Z position
is assigned to a particular spindle position. This means, that the same thread can be cut more than
once. The fixed assignment of the spindle position depends on the thread pitch which is entered in
the cycle. Because of the fixed thread pitch the correlated Z-dependent spindle position can not be
altered by the operator. The thread pitch can be positive or negative.
Marker M2095 is set at the start of the cycle. With this marker the PLC program can switch on the
spindle, if required, with M03 or M04. The marker M2499 (Close control loop - S-axis) must be set to
zero in acknowledgment. Only then can the orientation take place, and spindle and tool axis move
synchronously until the cycle has been completely processed. Before orientation the NC outputs an
M05. An acknowledgment is necessary.
After this, marker M2095 is reset by the NC and the control loop is opened. The spindle position is
displayed during tapping. The ramps for the drilling process are stored in MP3410.3.
F
0
S
0
M05
Acknowledge-
Rückmeldung
ment M-Funktion of
M function
M2095
M2499
Cycle Zyklusstart
Start
orientierter Oriented stop Halt
Positioning Positionierfenster window
reached erreicht (MP7150)
Ramp Rampe from aus
MP3410.3
Oriented orientierter stop Halt
End Zyklus of cycle
Ende
8/95 TNC 360 4 Spindle 4-103