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Production Methods: How to Turn a Flat Metal Disc into a Bottle-Necked Scuba Tank
They call it "hot spinning"
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.
Enter a caption (optional)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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This can also be done by humans!
Okay but not great.
Extreme 80s video effects FTW.
2nd try