Re: Arc Welders as Rheostats?? Variac Mod Question

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jack King by way of Terry Fritz <twftesla-at-qwest-dot-net>" <speakernut-at-yahoo-dot-com>

I have been vasillating over that myself, but, having
said that, what's the harm in modifying something that
"doesn't work" (for the application) in it's present
form, and turning it into something that does?

I can make an old iron core slider a-la bombarder type
stuff, but I like the idea of turning the wheel
instead of tugging on the core.


--- Tesla list <tesla-at-pupman-dot-com> wrote:
> Original poster: "david baehr by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <dfb25-at-hotmail-dot-com>
> 
> 
> Is there any way of you getting a welder or making
> your own inductor?? It
> would be a shame to cut a good variac! 
> 
> >From: "Tesla list" 
> >To: tesla-at-pupman-dot-com 
> >Subject: Re: Arc Welders as Rheostats?? Variac Mod
> Question 
> >Date: Fri, 29 Mar 2002 10:49:40 -0700 
> > 
> >Original poster: "Ed Phillips by way of Terry Fritz
> " 
> > 
> >Tesla list wrote: 
> > > 
> > > Original poster: "Jack King by way of Terry
> Fritz " 
> > 
> > > 
> > > Anyone out there have data on how "wide" the air
> gap 
> > > needs to be? My gut says something like .75-1"
> should 
> > > be sufficient to interrupt the flux travel...any
> 
> > > thoughts? I'm toying with "modifying" a 7.8 kva
> unit 
> > > for use as a series reactive ballast, and would
> like 
> > > additional insight before i dig out the band
> saw. 
> > > Also, does one need to replace the removed
> section 
> > > with epoxy or something along those lines to
> maintain 
> > > structural integrity? Lastly, might anyone know
> off 
> > > hand if cores on these older, larger dogs are
> silicon 
> > > steel strip or scintered iron encapsulated in
> epoxy? 
> > > 
> > > Cheers, 
> > > 
> > > Jack King 
> > 
> > That sounds like way too much gap, but I'm not an
> expert on calculating 
> >magnetic circuits. Someone else here probably is
> and can give you an 
> >answer. I would suspect the actual value should be
> of the order of 
> >0.050", depending on the core area and the number
> of turns. 
> > 
> > Don't think any 60 Hz transformers use anything
> but silicon steel for 
> >the cores, with the exception of very recent ones
> which use some of the 
> >"matallic glasses" for ultra-low loss cores. 
> > 
> >Ed 
> > 
> > 
> >
> 
> 
>