Which command would you use for a dwell time in CNC programming?

The command used for a dwell time in CNC programming is G04. This command specifically instructs the CNC machine to pause or dwell for a specified duration, allowing for a delay in the machining operation. This can be particularly useful in processes such as cooling, allowing a tool to settle, or waiting for the machine to synchronize with other operations.

In G-code, the dwell time is typically set in seconds or milliseconds following the G04 command, enabling precise control over the timing in the machining process. This ensures that operations are executed smoothly and efficiently, contributing to the overall quality of the finished workpiece.

The other commands mentioned do not serve the same purpose. For instance, M00 and M01 are stop codes used to halt the program, while G00 is utilized for rapid positioning and does not incorporate any dwell time. Hence, G04 is the correct choice for implementing a dwell time.