Sinestro vs Daredevil

Since Daredevil is the man without Fear he should be able to tank any Blast from sinestro since Sinestro's energy is based on Fear correct ?

Yes, absolutely correct.

I dont think it works like that, otherwise Sinestro would be utterly helpless against any robotic opponent (aka those beings who have no emotions and therefore dont feel fear). I mean, I dont see a standard T-800 Terminator simply standing unaffected against Sinestros force blasts, simply because it doesnt fear him.

It's because there are other beings in the universe that feel fear.

If there is an universe with just Daredevil, since he is the man without fear, Sinestro is powerless against him 😉