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Big Bertha – world’s largest tunnel boring machine – facing ...

Named after one of Seattle’s early mayors, the $80 million drill Big Bertha is 326 feet long, weighs 6,700 tons, and does much more than drill. John Blackstone reports on what the high-tech machinery can do, as well as its latest challenge digging in the depths of Seattle.

Bertha (tunnel boring machine) - Wikipedia

Some media have also referred to the machine as "Big Bertha". ... and is the world's largest earth pressure balance tunnel boring machine, at a cutterhead ...

Big Boring On Smaller Machines : Modern Machine Shop

This modular boring system lets you bore holes up to eight inches in diameter on machining centers with 40-taper spindles.

Large diameter boring on horizontal boring machine - YouTube

This is a pulp feeder with a tapered bore of 1/20. The large end is the one you see and it measures 47 inches. The bore is a bit over 6 feet long and is a st...

Big Boring Machine, Big Boring Machine Suppliers and ...

Big Boring Machine, Wholesale Various High Quality Big Boring Machine Products from Global Big Boring Machine Suppliers and Big Boring Machine Factory,Importer,Exporter at Alibaba.com.

Elon Musk’s Boring Company Wins a Big Boring Contract in ...

Another tunnel boring machine, ... Washington State's Department of Transportation flew a drone through Seattle's SR-99 tunnel created by the Big Bertha boring machine.

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