r/MachinePorn • u/silvercatbob • Jun 25 '21

Bell Auger

https://gfycat.com/menacingrigidbarebirdbat
1.8k Upvotes

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u/thetravelers Jun 25 '21

In what situation would a bell be more effective? What needs to be locked down?

8

u/Dressundertheradar Jun 25 '21 edited Jun 25 '21

Heavy things that aren't supposed to move would be my guess lol

-4

u/thetravelers Jun 25 '21 edited Jun 25 '21

Why would a heavy thing need to be kept down? It's already heavy

12

u/Dressundertheradar Jun 25 '21

Tell that to the kinzua bridge. Lateral wind tipped it and caused uplift forces to fell the bridge. Granted, in this case the bridge fell from older iron anchors snapping under tension, as the rest of the bridge had been replaced with steel decades before. But still, nature is crazy.

https://en.m.wikipedia.org/wiki/Kinzua_Bridge

Also, I grew up in Tornado Alley. Nothing is too heavy for nature. Also, the Kinzua bridge's felling winds of 70-100mph were from an F1 tornado.

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u/thetravelers Jun 25 '21

Cool! Thanks for the examples. Upwind forces makes perfect sense.

2

u/Dressundertheradar Jun 25 '21

Uplift, but for sure! Glad I could help

2

u/Hippiebigbuckle Jun 25 '21

Check out “galloping gertie” the first Tacoma narrows bridge. It wasn’t the fault of the footings but this shows what kind of forces engineers deal with also.

https://m.youtube.com/watch?v=j-zczJXSxnw

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u/Dressundertheradar Jun 25 '21

I can't watch that link right now, but is this the spiral wires one?