300 ton crank shaft

[solarman216]

Yes as title says just been looking at a big engine, designed or the biggest container ships, thousands of HP, 300 ton crank, how on earth do they manage that kind of machining? Rick

 

[jims-terrano]

Mind boggling isn't it Rick. How did they build the huge steam engines in such as the Titanic, I've seen the same size and type of engine as the Titanics in a Rolling Mill and it's huge.

 

[Mobieus_uk]

I would have guessed in sections then bolted together

 

[quixote]

Loads of info' in these links guys :thumb2 I wondered too, as I saw the crankshaft for a massive Wartsila marine diesel and wondered how the hell they did it. The crank is forged in 'U' sections, then each section is machined with an interference fit between a male and female spigot. I thought they would have used dowels too, but apparently the parts are so tightly joined it's not necessary

http://wonderfulengineering.com/worlds-largest-and-most-powerful-diesel-engine/

http://jalopnik.com/5421464/the-worlds-biggest-crankshaft

If you have a look at the figures, the efficiency in terms of HP vs displacement is pretty poor. The torque is through the roof though!!! :clap

 

[Bat21]

5.6 million lb/ft of torque at 102 rpm...... holy fek

 

[terranosaurusdoug]

Yep, two stroke-diesel-turbo, ohhhhh yes

 

[solarman216]

Loads of info' in these links guys :thumb2 I wondered too, as I saw the crankshaft for a massive Wartsila marine diesel and wondered how the hell they did it. The crank is forged in 'U' sections, then each section is machined with an interference fit between a male and female spigot. I thought they would have used dowels too, but apparently the parts are so tightly joined it's not necessary

http://wonderfulengineering.com/worlds-largest-and-most-powerful-diesel-engine/

http://jalopnik.com/5421464/the-worlds-biggest-crankshaft

If you have a look at the figures, the efficiency in terms of HP vs displacement is pretty poor. The torque is through the roof though!!! :clap

Ah imagined that they must have made it in smaller sections but could not see any joins, that explains why, still some very accurate machining going on here though, the method of joining is cool one part and heat the other, then whack em together, no way to get them apart after bar cutting, Rick

 

[quixote]

And you should see the size of the lathe they used to machine the bearing journals!!!

 

[Monaro Pete]

Yep, two stroke-diesel-turbo, ohhhhh yes

In my old job, we ran a couple of Detroit 2 stroke diesel V8's, these were turbo & super charged.
They sounded awesome when we fired them up.
They were years old, but ran really sweet.

 

[terranosaurusdoug]

In my old job, we ran a couple of Detroit 2 stroke diesel V8's, these were turbo & super charged.
They sounded awesome when we fired them up.
They were years old, but ran really sweet.

I'm not 100% but I think they are still used a lot in USA

 

[solarman216]

And you should see the size of the lathe they used to machine the bearing journals!!!

I love my little lathe but do wish it was big enough to turn brake drums and disks sometimes but a lathe that big, I could not generate the electric it would need, Rick

 

[quixote]

here you go, Rick

http://www.industrytap.com/worlds-largest-lathe-sale/14280

 

[terranosaurusdoug]

here you go, Rick

http://www.industrytap.com/worlds-largest-lathe-sale/14280

what makes the stock to go in it!!!

 

[solarman216]

here you go, Rick

http://www.industrytap.com/worlds-largest-lathe-sale/14280

Notice they do not mention price Rick

 

[terranosaurusdoug]

Notice they do not mention price Rick

99p starting bid :lol