HEIDENHAIN TNC 407 (243 020) Technical Manual - Manual (Page 241)

4-116
TNC 407/TNC 415/TNC 425 4 Main Spindle 01.98
4.4.2 Tapping with floating tap holder and BCD-coded
spindle-speed output
The following diagram shows the sequence of events in the cycle:
0
F
0
S
M03
M05
M04
Acknow-
ledgement
of M code
M2048
Cycle
start End of
cycle
MP7120.0
Dwell time from
CYCL DEF 2.3
MP7120.1
Since, with BCD-coded spindle speed output, the spindle- and feed ramps cannot be synchronized
by the NC, a machine parameter MP7120.1 was introduced to enable the spindle to be switched off
early.
The machine parameter MP7120.0 (dwell-time for change of direction of rotation) and the
programmable dwell-time are just as effective as for analogue spindle-speed output.
MP7120.1 Pre-cut out time for the spindle when tapping with BCD-coded output
Entry: 0.0000 to 65.535 (s)