TNC 426/TNC 425/TNC 415 B/TNC 407
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Programming
Automatic tool change: M101
This function can vary depending on the individual machine tool. Your machine manual provides
more information on M101.
Standard behavior – without M101
When the tool reaches the maximum tool life (TIME1), the TNC flags this
information in the TNC memory. The machine tool builder determines
how the individual machine tool will respond to this condition (refer to the
machine manual).
Automatic tool change – with M101
The TNC automatically changes the tool if the tool life (TIME1 or TIME2)
expires during program run. However, the tool is not changed immediate-
ly after expiration of the tool life, but, depending on the workload of the
processor, a few NC blocks later.
Duration of effect
M101 is reset with M102.
Standard NC blocks with radius compensation G40, G41, G42
The radius of the replacement tool must be the same as that of the
original tool. If the radii are not equal, the TNC displays an error message
and does not replace the tool.
Tool change position
A tool change position must be located next to or above the workpiece
where no collisions are possible. With the miscellaneous functions M91
and M92 (see page 5-39) you can enter machine-referenced (rather than
workpiece-referenced) coordinates for the tool change position.
If T0 is programmed before the first tool call, the TNC moves the tool
spindle in the tool axis to a position that is independent of the tool length.
If a positive length compensation was in effect before T0, the clearance to the workpiece will be reduced.