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Old 05-14-2024, 05:43 PM
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Default How do you grind a Crankshaft this big?

I’am stunned!
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Old 05-14-2024, 06:06 PM
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https://www.bing.com/videos/rivervie...A&&FORM=VRDGAR

with a big cnc machine apparently

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Old 05-14-2024, 06:07 PM
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https://www.bing.com/videos/rivervie...A&&FORM=VRDGAR

with a big cnc machine apparently

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Old 05-14-2024, 06:16 PM
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.010 under just like everything else.

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Old 05-14-2024, 06:40 PM
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By the time you pay for machine work on it, it's just as much $ to get a new stroker setup.

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Old 05-14-2024, 07:09 PM
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I noticed it is very low RPM, I wonder how important or tight the tolerances are on something like that.

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Old 05-14-2024, 07:23 PM
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just put butter on the bearings and let her rip.

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Old 05-14-2024, 09:48 PM
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Just think how long the shoe laces would need to be and how much emery cloth it would take to polish that baby! Ha.

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Old 05-14-2024, 10:22 PM
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Those main diameters eat HP, Oh the agony!

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Old 05-14-2024, 10:23 PM
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Who knew?

From an online "Technology Review" .... "The crankshaft is semi-built comprising combined crank pin/web elements forged from a solid ingot and the journal pins then shrunk into the crank web."

I suspect anyone within a mile of that forge could feel the impact.

It's bizarre to think there's a need for something so huge, but I guess if there's a will, there's a way...

Link to Manufacturer's Tech Review

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Old 05-16-2024, 12:24 AM
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Quote:
Originally Posted by Half-Inch Stud View Post
Those main diameters eat HP, Oh the agony!
Yeah; from 15,000 to 14,999…

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Old 05-16-2024, 12:26 AM
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Quote:
Originally Posted by steve25 View Post
I’am stunned!
No big deal, but I would hate to be the guy who has to set the stroke on the grinder or dress the radius on the grinding stone!

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Old 05-16-2024, 09:56 AM
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Some more perspective on the size. Notice the turbocharger.

Used to propel ships like this. I work for the tugboat company you see in the video. The small tugs are 92' 4700 HP and the large one is 138' and 8000 HP. For a total of 23,650 HP to assist the ship to the dock.

The CMA CGM Benjamin Franklin in the video was only capable of carrying 18000 20' containers. The latest ships now are capable of carrying over 24,000 containers.

https://www.youtube.com/watch?v=ytkvvvpGRzs

https://en.wikipedia.org/wiki/CMA_CGM_Benjamin_Franklin

https://gcaptain.com/chinese-shipyar...at-24346-teus/

https://maritime-executive.com/artic...orld-s-largest
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Old 05-16-2024, 10:20 AM
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The bigger they are, the slower they turn. A typical EMD locomotive engine , 645 cu.in per cylinder, 12 to 20 cylinders has a top speed of 900 RPM..a so-called medium speed diesel.

George

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Old 05-16-2024, 02:35 PM
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Quote:
Originally Posted by george kujanski View Post
The bigger they are, the slower they turn. A typical EMD locomotive engine , 645 cu.in per cylinder, 12 to 20 cylinders has a top speed of 900 RPM..a so-called medium speed diesel.

George
George, I have overhauled EMD fuel injectors. They’re only four feet long and weigh around 100lbs each. Our opening pressure test rig had an actuator handle three feet long.

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Old 05-16-2024, 03:15 PM
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There is a "Crab" which spans two adjacent cylinders to hold them down to the fabricated block. Torque on the crab bolt is 1600 ft-lbs as i recall. Who has the torque wrench?

george

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