Material selection for weeble wobble principle
Material selection for weeble wobble principle
(OP)
I am working on a project using the weeble wobble principle ht tp://en.wi kipedia.or g/wiki/Wee ble#Design _principle .
At the moment I am using a stainless steel 4mm diameter hemisphere but this is not heavy enough.
I've been looking a more dense materials like copper and was wondering what you guys recommend?
The material can not be toxic or harmful to the user.
At the moment I am using a stainless steel 4mm diameter hemisphere but this is not heavy enough.
I've been looking a more dense materials like copper and was wondering what you guys recommend?
The material can not be toxic or harmful to the user.





RE: Material selection for weeble wobble principle
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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.
RE: Material selection for weeble wobble principle
I think that the bottom of the weeble in your link is not a perfect hemisphere, but more like a section of an oblate spheroid. Would want to do a little math (like calculus) to convince myself...
RE: Material selection for weeble wobble principle
I like tungsten; it can look a bit like stainless steel, until you try to pick it up.
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RE: Material selection for weeble wobble principle
IRstuff: "a bottom which is a more or less smooth (unfaceted) hemisphere" I does not seem to say convex anywhere.
Also as I'm new to this post is there any way I can reply to individual posts?
RE: Material selection for weeble wobble principle
Never mind the latter part of my post - a hemisphere, or more better a spherical segment, will work.
Copper is not a lot heavier than stainless steel, but I'm still not clear how much heavier you need to get. Do realize that the weebles are a plastic shell, with a weight (likely a chunk of zinc) inside it. I.e. try hollowing out the hemisphere (or spherical segment) and loading a small amount of heavy alloy (like lead that you then coat with epoxy adhesive/sealant) near its base. Bismuth/tin solder is readily available and quite non-toxic, and would be a good choice for this kind of idea, as you can easily melt the stuff and pour it into the hollow.
RE: Material selection for weeble wobble principle
RE: Material selection for weeble wobble principle
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Plymouth Tube
RE: Material selection for weeble wobble principle
Aaron Tanzer
www.lehightesting.com
RE: Material selection for weeble wobble principle
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Material selection for weeble wobble principle
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Plymouth Tube
RE: Material selection for weeble wobble principle
RE: Material selection for weeble wobble principle
The light material I am using is hollow plastic how ever it is quite high, almost 30 cm tall.
Costing is also an issue as it is meant to mass produced (10000+ units) so the price of the end product is around 20 British pounds.
EdStainless: Im not quite sure what you mean, I was a bit unclear in my original post. The thing I'm making is not egg shaped, it is more like a plastic stick with a solid bottom hemisphere. Sort of like this but not as tall http:/
I will looking in to all the other suggested materials.
Just like to add I'm new to this forum but I can already tell is great!
RE: Material selection for weeble wobble principle
One low cost way to do this is to use shot (lead) and pot it in a resin inside your base. It would be inclosed, fastened, and easy to place (no dimensional tolerances).
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Plymouth Tube