Comments on: How to make a perfect hollow iron sphere

By: Zairac

Zairac — Sat, 23 Jul 2011 08:38:17 +0000

Another idea. Make a ‘perfectly’ spherical mold out of two partial hemispheres of conductive metal and the equator made of a non-conductive material. It’s key that all 3 parts mate perfectly so the interior of the mold is a perfectly smooth sphere. Connect a thin iron wire to the inner poles of each hemisphere so that when the mold closes it runs from one to the other. Close it and apply a large electric current across the hemispheres. The iron will vaporize, spread outward radially and coat the inside of the mold: perfect… at least until you destroy it by opening the mold. Nobody said you couldn’t leave the mold material on the outside though.

By: Zairac

Zairac — Sat, 23 Jul 2011 08:25:14 +0000

I’m sure everyone has moved on since the copyright here expired a few years ago, but… you can plasma coat iron onto materials with a lower melting point than iron without deforming the mold and only having microscopic surface impefections (far better than most castings). So:
1. Make a sphere of ice as perfectly as possible (likely molding and refining).
2. Plasma coat with iron.
3. Build up a suitable iron shell.
4. Heat the iron shell for a good long time but keep it below it’s melting point.
5. Surprise, surprise the water will leave and be replaced by air BECAUSE no container, even a “perfect iron sphere”, is perfect! The water/steam will escape through the metal over a long enough time. Try saving a Coke can in your attic for a few years.

Heating just helps speed things up but isn’t required. Yes the water may/will rust the inside and I don’t think cathotic protection will work since free electrons will move to the outside of the sphere. Smaller is better as the time to empty and surface area to volume will lead to less opportunity for rust.

Alternately use a core that won’t rust it, perhaps glacial acetic acid as I doubt it will rust iron and can be vaporized until it escapes.

By: hollow iron ball

hollow iron ball — Sun, 01 Jun 2008 05:09:17 +0000

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By: General Bordeaux

General Bordeaux — Fri, 02 May 2008 12:22:47 +0000

@vendi wtf

By: vendi

vendi — Fri, 02 May 2008 08:18:15 +0000

Hello, I have the answer juz visit this(www.metacafe.com/watch/417094/make_a_cute_and_sexy_little_sphere) link and u will knw. Easy to prepare a hollow iron sphere. but it need great people to do that…

By: Life - A Journey » Blog Archive » Last Week Report

Life - A Journey » Blog Archive » Last Week Report — Sat, 15 Mar 2008 02:02:03 +0000

[...] Life – A Journey That never ends !!! « How to make a perfect hollow iron sphere [...]

By: General Bordeaux

General Bordeaux — Wed, 12 Mar 2008 10:31:49 +0000

@Rao are you copying it from one of the patents that smr has mentioned in his comment

By: Rao

Rao — Wed, 12 Mar 2008 07:10:16 +0000

“@Rao: How exactly are you going to suspend the ball.”

Easy. Melt some iron. put it in a syringe of some sort and slowly push it out of the syringe. When the last “contact” is leftjust have a wire or a fast moving blade to cut off the link.

By: Gaganpreet Singh

Gaganpreet Singh — Tue, 11 Mar 2008 17:30:18 +0000

@Rao: How exactly are you going to suspend the ball. That’s my only doubt.

One way we can use this vacuum thing and stuff is by observing the property that a falling drop has a spherical shape. If I drop liquid iron from enough height so that the iron solidifies before reaching the ground, I can get hollow spheres. (Vacuum because otherwise the drops will take tear shape).

I’ve thought of 5 other methods to solve this problem. I guess I’ll post them in my blog when I get time.

By: General Bordeaux

General Bordeaux — Tue, 11 Mar 2008 16:42:59 +0000

@Sukesh as ZenWalker point is valid. so you solution is still wrong.
@ZenWalker thanks zenwalker for the solution and for pointing out the mistake in sukesh’s solution as well.
@Rao this sounds interesting but it can be accepted if some more people vote for you
@all smr’s comment was marked as spam … i just approved it. makes an interesting reading