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Production Methods: How to Turn a Flat Metal Disc into a Bottle-Necked Scuba Tank

They call it "hot spinning"

By Rain Noe - March 4, 2015

in Materials

Plastic bottles are made by blow-molding, a beautiful, elegant process that can create a full-bodied shape with a narrow little neck. But how the heck do they make scuba tanks, fire extinguishers and gas canisters, which have similarly narrow necks, but are of course made of non-blow-moldable metal?

My first thought was that they make them in two halves via metal drawing, then weld them together—but obviously that makes no sense. So I looked into and found that yes, a scuba tank comes from a single flat disc of metal alloy.

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And while drawing is still the initial production method, I wasn't aware that what they call "hot spinning" is how you get the bottleneck:

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Sam A

9 years ago

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http://youtu.be/43N44ICyuEU
This can also be done by humans!

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Sabine Hoffmann

9 years ago

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Okay but not great.

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Carl Alviani

9 years ago

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Extreme 80s video effects FTW.

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Sam A

9 years ago

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2nd try

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