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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.
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.