The number of CNC machines that a CNC operator should use depends on the specific industry, job requirements, and operator’s skill level. Typically, a CNC operator will operate one machine at a time, with some exceptions.

In general, a CNC operator should be trained and proficient in the operation of one specific type of machine before moving on to another. This allows the operator to focus on mastering the operation of one machine and to become more efficient and productive.

However, in some cases, an operator may be trained to operate multiple machines of the same type, such as multiple CNC Lathes or multiple CNC mills, as they may have similar controls, functions, and operations. It is also common for CNC operators to be trained to operate multiple machines of different types if the job requires it.

In some industries, such as job shops, small to medium scale production facilities, it is common to have one operator per machine, but in larger scale production facilities, it’s common to have one operator operate multiple machines.

In summary, the number of CNC machines an operator should use depends on their skill level and job requirements. Typically, an operator should focus on mastering one machine at a time, but in some cases, they may be trained to operate multiple machines of the same or different types.