| 摘要 |
A "safe" position for a tool changing operation in a numerically controlled machine tool is determined based on specific tool size and machining location. In one embodiment, tool change positions are taught in a teaching operation, and are stored for future reference. During machining, as each tool changing position is encountered, a pointer has advanced to the next such position so that, upon execution of the next tool changing command, the unit moves to the appropriate location. According to other embodiments, the machining program itself is made to store the tool changing positions. This data may be added to the program by an editor on the basis of the information found in the memory, or the data may be added in the initial creation of the program. The data on tool changing positions is then decoded from the machining program when the program is read or executed.
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