The reason for this is because you need a hammer to break the Junk Machine. Nothing else can. Therefore, when you hit it, it can't produce materials, as it registers as "must break".
Hope I cleared that up for you. Welcome to the forums!
Re: Junk Machine
Posted: Sun Dec 16, 2012 12:48 am
by unfaithful p1nkbr0
It's the same with shelves and showcases… although you might be able to hex hammers into those.