300 ton crank shaft

solarman216 · 23-05-2016, 01:13

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 · 23-05-2016, 07:20

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 · 23-05-2016, 12:52

I would have guessed in sections then bolted together

quixote · 23-05-2016, 12:54

Loads of info' in these links guys

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/worl...diesel-engine/

http://jalopnik.com/5421464/the-worl...est-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!!!

Bat21 · 23-05-2016, 19:09

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

terranosaurusdoug · 23-05-2016, 21:32

Yep, two stroke-diesel-turbo, ohhhhh yes

Monaro Pete · 24-05-2016, 15:50

Quote:

Originally Posted by terranosaurusdoug

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.

solarman216 · 23-05-2016, 22:23

Quote:

Originally Posted by quixote

Loads of info' in these links guys

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/worl...diesel-engine/

http://jalopnik.com/5421464/the-worl...est-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!!!

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 · 24-05-2016, 13:41

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

solarman216 · 24-05-2016, 21:59

Quote:

Originally Posted by quixote

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

23-05-2016, 01:13	#1
solarman216 Off road maniac Join Date: Dec 2009 Location: Bexhill on Sea Vehicle: Y60 Patrol Me, 3 ltr Mrs Posts: 17,431	300 ton crank shaft 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 __________________ Ex banger racer now off road maniac Lokka on the front with manual hubs Diff lock on rear 3 inch SS straight through exhaust Manly winch bumper with 13000 lb winch 10 spike ground anchor, with multiple straps and blocks Super strong body cills capped with scaffold pole 20% stronger springs all round aggressive off road tyres on wheels so just swap. Aim to get stuck and be completely self sufficient in extraction, love getting muddy, 2ft deep is good but rare.

23-05-2016, 07:20	#2
jims-terrano Senior Member Join Date: Sep 2004 Location: UK Posts: 12,965	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.

23-05-2016, 12:52	#3
Mobieus_uk Senior Member Join Date: Aug 2014 Location: Tonbridge Vehicle: Terrano ii SE+2.7tdi Posts: 232	I would have guessed in sections then bolted together

23-05-2016, 12:54	#4
quixote Senior Member Join Date: Apr 2013 Location: Near Dundee, Scotland Vehicle: Nissan Terrano 3.0 Posts: 482	Loads of info' in these links guys 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/worl...diesel-engine/ http://jalopnik.com/5421464/the-worl...est-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!!!

23-05-2016, 19:09	#5
Bat21 Administrator Join Date: Feb 2007 Location: Shropshire Vehicle: Tonka Toy Posts: 1,044	5.6 million lb/ft of torque at 102 rpm...... holy fek

23-05-2016, 21:32	#6
terranosaurusdoug Senior Member Join Date: Sep 2014 Location: Yorkshire, J33 M62 Vehicle: 2000 Terrano lwb 2.7TDI Posts: 5,500	Yep, two stroke-diesel-turbo, ohhhhh yes

24-05-2016, 13:41	#9
quixote Senior Member Join Date: Apr 2013 Location: Near Dundee, Scotland Vehicle: Nissan Terrano 3.0 Posts: 482	And you should see the size of the lathe they used to machine the bearing journals!!!