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[TechInsider] This 6,700-ton monster machine has been stuck under Seattle for two years - Page 2

post #11 of 18
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Quote:
Originally Posted by jlhawn View Post

I live 50 miles south of Seattle but I drive to Seattle at least 3 times a month, this entire job has been a big joke and has caused many arguments with city officials and contractors.
the tunnel was to replace the Alaskan Way Viaduct which is an old overpass down by the waterfront. it would have cost less and been finished by now if they just replaced the overpass
or just repair it as it has earthquake damage but is still in use. The large drill was made in Germany and is very good equipment but it has been operated by incompetent contractors that the city is now suing. It's just a big mess, and the news has a different story on it every week so you don't know what is true anymore of what it is going on.


The drill was made by Hitachi Zosen Sakai Works in Osaka, Japan not Germany. This does seems to be fail of an attempt in many ways .
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post #12 of 18
the Chicago deep tunnel would like a word with you Seattle.
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post #13 of 18
Quote:
Originally Posted by Zen00 View Post

It's interesting how a flaw of a few millimeters will change the outcome these days. Remember in the good ol' days when you could say "eh, close enough"?

In mechanical engineering terms,a few mm is a yawning chasm.......
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post #14 of 18
I love how they had to dig a huge hole just to get to the drill haha, good thing they were not completely underwater yet haha
   
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post #15 of 18
Quote:
Originally Posted by Zen00 View Post

It's interesting how a flaw of a few millimeters will change the outcome these days. Remember in the good ol' days when you could say "eh, close enough"?

I work in a manufacturing plant and have knowledge on how things have changed since "the good ol' days'. The equipment is totally different.

The plant I work in (As a Quality Engineer) manufacturer custom hydraulic cylinder, up to 28" bore, up to 50' long, down to 1" bore, a few inches long. Most our tolerances in the whole range for machined parts is 0.010", we then have a good deal at 0.005" along with specific surface roughness requirements. For press fitting pieces, we go down to 0.0002" that needs to be measured with a CMM machine.

To compare, 2mm is 0.079" approx., for us, this is huge it can be the difference between if the part actually fits in the machine or not. For us, talking about hundreds of thousand dollar cylinders, the tolerances need to be me.

The different of all of this compared to 'the good ol' days' is that back then, the equipment wasn't nearly as sophisticated, as precise, as well built compared to today. If something was off back then, they'd just mill or grind off the excess because they weren't using safety factors as we're doing now. They had much more "meat" to remove, this made equipment ultra heavy, also parts that were exposed to wear and tear worn out pretty quickly and needed to be changed quite often creating a good deal of down time.

If a part needs to be 10.000"-10.005" to fit in a hole that's 10.010"-10.020" to be bolted on properly, only single mm would be way out of tolerance.

I hope this can help you understand why a few mm can make it un-usable smile.gif
post #16 of 18
Quote:
Originally Posted by The Cheev View Post

Also the entire waterfront is built on "fill aka 1800s garbage...literally" so drilling is weird as there is no consistency to the material and if they go to fast the hole falls apart and the Salish Sea rushes in to fill it

Sent from my SAMSUNG-SM-G920A using Tapatalk
Also parts of New York City are built on what is essentially garbage.
post #17 of 18
Quote:
Originally Posted by kaistledine View Post

The drill was made by Hitachi Zosen Sakai Works in Osaka, Japan not Germany. This does seems to be fail of an attempt in many ways .


redface.gif your'e correct. I apologize, I was thinking of another item in Seattle for a construction deal.
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post #18 of 18
Quote:
Originally Posted by jlhawn View Post

I live 50 miles south of Seattle but I drive to Seattle at least 3 times a month, this entire job has been a big joke and has caused many arguments with city officials and contractors.
the tunnel was to replace the Alaskan Way Viaduct which is an old overpass down by the waterfront. it would have cost less and been finished by now if they just replaced the overpass
or just repair it as it has earthquake damage but is still in use. The large drill was made in Germany and is very good equipment but it has been operated by incompetent contractors that the city is now suing. It's just a big mess, and the news has a different story on it every week so you don't know what is true anymore of what it is going on.

Though, the drill was made in Japan by Hitachi Zosen, everything else is about right. They should of just replaced the viaduct.
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