There is no problem. The tool change command without M06 code is used to prepare the next tool, which will be used in the next operations, on the ATC arm. While the current tool starts machining, the next tool is taken from the magazine by the ATC arm and the tool waits for tool change to start on the ATC arm. This is done to speed up the tool changing process. If you dont have a magazine and an ATC arm, then the second tool change command without M06 code is meaningless.
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