The working range is like the space where you can play without getting in trouble. Just like when your parents tell you not to wander too far from them at the park, machines and tools also have their own working range that you should follow.
For example, let's say there's this big robot arm that can move things around. It has a special space where it can reach and grab things safely. If you put something outside that space or get too close to the robot arm while it's moving, you could get hurt.
So, the working range is basically the area where machines and tools can do their job without causing any harm to people or things around them. It's important to pay attention to the working range so that you can stay safe and avoid accidents.