Wolverine's claws are pretty much impossible to work as they are advertised in the comics/movies.
Firstly, they can only be as long as his forearms, and they are often portrayed as at least such. Any longer, and they'd impede the use of his elbows when retracted. Assuming that, when they are protruding, it's safe to say the backs of them have moved to his wrists or, worst case, the backs of his hands.
Secondly, given the claws' retractable nature, they need to be attached to muscle and independent of Wolverine's skeletal frame despite themselves being bone.
Thirdly and most importantly, regardless of how sharp they are or how strong adamantium is supposed to be, cleaving with them into any substance with significant resistance like metal or wood would tear the flesh of his forearms and hands most likely declawing him entirely in gruesome fashion. Of course he'd heal, maybe even grow new claws (sans adamantium, of course,) but that's a lot of pain to go through every time the day needs saving and it wouldn't work anyway...