CNC operators are responsible for setting up, programming, and operating CNC machines. They are responsible for ensuring that the machine produces high-quality parts that meet customer specifications. Therefore, it is essential for CNC operators to have good training in order to:

1. Understand the machine: CNC operators need to understand how the machine works, how to set it up and how to program it in order to produce high-quality parts.
2. Ensure safety: CNC machines can be dangerous if not operated properly, so training is essential for ensuring the safety of the operator and other personnel.
3. Increase productivity: A well-trained operator will be able to set up and program the machine quickly and efficiently, which can increase productivity and reduce downtime.
4. Improve part quality: A well-trained operator will be able to produce parts that meet customer specifications and have a good surface finish, which will improve the quality of the parts.
5. Identify and troubleshoot problems: A well-trained operator will be able to identify and troubleshoot problems that may occur during the machining process, which can reduce downtime and improve production efficiency.
6. Keep the machine in good condition: A well-trained operator will be able to perform basic maintenance on the machine, which can prolong its life and reduce the need for costly repairs.

In summary, good training is crucial for CNC operators to ensure the safety, productivity, and quality of the parts produced by the CNC machine. It also helps the operator to have a better understanding of the machine and its capabilities which will lead to better utilization of the machine.