Right, id have to paper macche it or something similar for rigidity, and at
that point It might be quicker to consider a couple of large plastic salad
bowls instead :)
Those inflatable exercise balls are approx $5 each which is very cheap, vs
$20 ish for a 40qt Plastic 'hemisphere' but the labor for the inflatable
would likely balance it out.
My concern with the polycarbonate bowls is how easy they can crack, but I
suspect that is mostly related to tools and techniques.
On Fri, Oct 19, 2018, 12:16 PM jimlux <jimlux@xxxxxxxxxxxxx> wrote:
> On 10/19/18 8:59 AM, Matthew Sweeney wrote:
> > Good info, although I'd still like to find someone who has done similar
> > work with one of those inflatable exercise balls.. that would be an
> awesome
> > VDG terminal :)
>
> It's out there in the archives.. Except it was a kid's bouncy toy, the
> name of which I cannot remember, they have a loop sticking out of the
> top that you hang on with.
>
>
> When I worked at the effects shop, we made some large "pendulum bobs"
> for a sort of "giant executive toy"
> (
> https://www.amazon.com/JoyTech-Newtons-Collision-Decompression-Psychology/dp/B07921155N
> )
>
> using those things, somewhat overinflated, covered with fiberglass, then
> spray painted aluminum. They weren't heavy enough without the fiberglass
> to swing like we wanted, but for an electrode, maybe ok.
>
> A hole will cause it to deflate.
>
> You might be able to figure out a way to inflate and deflate it, but for
> a VDG, you need the hole for the belt, so using it as a form upon which
> to make something rigid.
>
> If you want a plastic hemisphere, a good way is to build a box with a
> plywood top and a circular hole. You lay a sheet of plastic on top,
> heat it with radiant heat, then use a vacuum cleaner to pull a vacuum
> under it, and it will form a nice hemisphere. Let it cool, repeat it,
> saw the flange off and join it.
>
> But a spherical buoy might be a cheaper way to go..
>
> Kwiktek B-20R from amazon is <$20, might be inflatable, though.
>
> or
> https://pr-tech.com/product-category/power-line-markers/
>
>
>
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