This is great!! It is a very clever use of tweening and it really absorbs the viewer. It makes us want to see what happens next in the assembly line. I also love how the background is animated as well which makes the whole thing much more dynamic.
A thing about the tweening-you have really great easing which shows the force of the object ie. the part where the items were being crushed, and you also put emphasis on the force by adding a slight camera shake when the smasher-thing slammed down. I was also very impressed by the attention to detail on the first apparatus. The little gears turning and extra hydraulics make the whole thing all the more brilliant!
over all, a great work of animation!