The detection of the process irregularities listed above is achieved through the formation of suitable measuring curves which, after they are filtered with various limits, are delimited in accordance to the monitoring task.

As soon as a limit on the measuring curve is violated, an associated relay or optocoupler closes a switch which, that for example, triggers an immediate feed stop, a switchover of the feed speed, the selection of another tool, or the storage of the tool position.

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