I am currently in the process of imagining and testing sound designs for a robot that is up to bad things, going after people (think Terminator type of hunting, not necessarily fast but obviously unstoppable). The robot does not speak, but I'd like it to have this sound that I'm looking for and that I'd like you guys to help me find.
Think about the time when you rewound audio tapes with your hi-fi tape deck. Once you reached the top of the tape, the mechanism used to go "clac clac clac clac clac" until you released the "<< RWD" button. I imagine it's a safety mechanism that disengages the spinning things to prevent tearing the tape.
Now I'm pretty sure I've already heard a similar sound on bigger machines, that sounded bigger, more like a "tak tak tak tak tak". This is the sound I am looking for, unfortunately I can't seem to think of a device that'd make the noise.
Do you have any clue as to where one can hear a similar sound?