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I wonder what kind of blade steel this thing uses.

Nom nom nom...

I would guess it uses a relatively low carbon steel for the teeth considering that they take a lot of strain and wouldn't want to be hard. Maybe something like 1045.
 
The machine shop I used to for built a tire shredder that was very similar in design and use. If I remember correctly we used AR400 steel for the blades that were hard surfaced around all the cutting surfaces. AR400 is 400 Brinell hardness and is very tough. But since they are cutting steel the blades could be made from a tool steel like D2. D2 is used in a lot of shearing and die cutting operations.
 
that is impressive. But I have a feeling the performance of such a thing is highly reliant on its design and not just the steell its made of. Regardless it must be some good stuff.
 
Ok I watched the video a few more times, I find the action of the blades really interesting. If I were to design something like that I would think it would work best with two sets of blades spinning opposite of each other and actual cutting done in a scissor action against one another, I see they use blades that are more the shape of chainsaw teeth and just rip (with big "hammers" behind them for inertia and to clear debris from the cutting edges).

My design would also include a heavy flywheel and keep its speed up with inertia from the FW, that appears to use an indirect hydraulic drive system, again overall very impressive.

Now don't take my comments as me saying I could design something better, I absolutely couldn't, that beast appears to work very well, just saying what I would have designed first (before probably coming to the conclusion that my way wasn't the best way and going out of business).
 
It's not doing the work you guys think it is.

It's an industrial shredder made to handle large objects with different materials. The top "teeth" tear more than they cut. It has protrusions around each gear that starts tearing long before they come into contact with the teeth of the opposing gear (which is what allows it to eat things as big as a car). Also the gears are bi-rotational, and one of the most impressive features is the magnetic separator that starts separating useful scrap from garbage.

Here is a more direct picture of the teeth of the Hammel Primary Shredder.

1233.jpg


Here is a video that gives you a better view of the action. Think about it - even an economically designed hydraulic shredder with 800 horespower won't be able to compact all objects enough to just pull them through the machine outright - the reverse rotation allows it to tear the object apart into smaller pieces, and then pull the smaller or weakened pieces through the shredder.

[video=youtube;llBrUX6Pfkk]http://www.youtube.com/watch?v=llBrUX6Pfkk[/video]
 
That thing is the stuff nightmares are made of. I bet it's the threat of choice for some mob somewhere.
 
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