In the 'good old days of spark transmitters' it was common for rotor or
even the rotor and stationary electrodes of tthe rotary gap to be made
of cast zinc and I don't remember reading of any health problems or any
precautions. Besides , you get a nice blue spark.
Ed
Futuret wrote:
>I've heard that vaporized zinc (from the galvanizing) is
>extremely toxic. Whenever I've tried using brass
>electrodes they eroded away very quickly. I've had
>much better results with copper electrodes. Others
>may have had different results, but I thought I'd
>mention it.
>
>John
>
>
>
>
>
>
>
>-----Original Message-----
>From: Greg Peters <greg.j.peters@xxxxxxxxx>
>To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
>Sent: Thu, Nov 21, 2013 11:55 pm
>Subject: Re: [TCML] DC Coil progress.
>
>
>Thanks everyone for their interest in this project. I will post more
>pics of the various components and transformers over the weekend.
>
>I have some 10mm galvanised steel rod on hand so I will substitute
>that until I can find some brass. Hopefully it will perform OK. Sounds
>like it will be OK given what Dave said in his post, though I wouldn't
>have though the thermal conductivity would be any better than
>stainless.
>
>Ted, thanks for the info. That 6 mot coil of yours must be a real
>beast. I've been wanting to build a 3-phase coil since I was a
>teenager! I'm hoping to not have to use any filter cap at all given
>that I will only be drawing 5-6kW from a supply that could easily do
>10. It will be nice to not have to pull 40A from one phase and dim the
>neighnours lights! I'm still working the choke thing out. I was
>contemplating having a go at winding one myself. Or the series gapped
>mots could work too. Still trying to decide which way to go with it.
>
>Greg, that's a great paper and coil there and I appreciate having some
>real DC coil specs on hand. I like your "medium" designation for a
>50kW coil!
>
>I'm happy to try any power supply configuration if you're willing to
>advise a suitable topology. I find the one I posted easy to understand
>but would need help setting up a delta version. I need a topology that
>extracts the full phase to phase voltage, or at least close to it,
>given that my transformers are only 2400v.
>
>I was planning to use 6 MOTs, they have 240v primaries and 2400v
>secondaries. We run 240v here in Oz, so I have 415v between phases. I
>was going to run two mots per phase with the primaries in parallel and
>the secondaries in series. The primaries were going to be run between
>active and neutral in a star configuration, as per the image on my
>site. This gives 24kV or so in the tank circuit after the choke.
>Naturally there is the potential to run the primaries in series
>between phases in a delta configuration. Are you able to offer some
>advice on how such a configuration should be set up?
>
>Anyway, I hope all that makes sense. Thanks again everyone for your
>advice and interest.
>
>
>
>
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>
>
>
>
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