Re: Brass or steel spheres (Oudin terminal)

To: tesla-at-pupman-dot-com
Subject: Re: Brass or steel spheres (Oudin terminal)
From: "peterB" <zardoz-at-albany-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
Date: Tue, 22 Feb 2000 01:13:55 -0700
Approved: twftesla-at-uswest-dot-net
Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

I found a source of pre tapped and threaded brass spheres of around 1/4" to
4" and larger (the larger sizes being hollow.)

Thanks for all the responses.
I can get the source if anyone is interested.

-Pete

Tesla List wrote:

> Original Poster: "Antonio Carlos M. de Queiroz" <acmq-at-compuland-dot-com.br>
>
> Tesla List wrote:
>
> > Original Poster: "peterB" <zardoz-at-albany-dot-net>
>
> > I have a perticular application that needs solid (or hollow) brass or
> > machineable
> > steel balls for a terminal on a small coil.
> > The small float balls will not work. The maximum diameter is 1 1/4"
> (actually,
> > that is the exact size I need.)
> >
> > I have tried McMaster Carr, but they only have smaller sizes available.
> > They have the correct size in bronze, if this would work. I do not know
> > the electrical properties of bronze, would it be a good conductor, and
serve
> > as the terminal on a small Oudin resonator?
>
> Bronze is as good as brass. Somewhat heavier, and easy to machine.
> For this application any metal serves.
> Possible sources of small balls are furniture knobs and Chinese exercise
> balls (too big?). Steel bearing balls can be softened, but I would not
> even try. I make all my terminal balls in the lathe, using a ball
> turning
> tool for solid balls (or some calculations, lots of measurements and
> patience without a tool), or metal spinning for hollow balls:
> http://www.coe.ufrj.br/~acmq/spinning
>
> Antonio Carlos M. de Queiroz