Re: Ganging Variacs (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Thu, 16 Aug 2007 20:53:22 -0600 (MDT)
From: Chip Atkinson <chip@xxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Ganging Variacs (fwd)

Man, I have to agree with Dave.  You can get a decent arc welder on ebay.
I use a lincoln AC-225.  I have it wired in series and put a plug on the
outside of the power cabinet.  On top of it all I have an arc welder!

My feeling is that why wreck either a good variac or a good welder when
you can set things up so you can preserve both?

The arc welders on ebay are around $100-200 and shipping seems to max out
at $55.99.

Looking on ebay, variacs are at least that.

Chip

On Thu, 16 Aug 2007, Tesla list wrote:

> 
> ---------- Forwarded message ----------
> Date: Fri, 17 Aug 2007 02:42:26 +0000
> From: david baehr <dfb25@xxxxxxxxxxx>
> To: tesla@xxxxxxxxxx
> Subject: Re: Ganging Variacs (fwd)
> 
> 
>  
> 
> Why waste a nice Variac ?,...get a cheap variable shunt  arc welder and
> be done with it,
> 
>   
> 
> 
> 
>  
> 
> ________________________________________________________________________________
> 
>       From:  "Tesla list" <tesla@xxxxxxxxxx>
>       To:  tesla@xxxxxxxxxx
>       Subject:  Re: Ganging Variacs (fwd)
>       Date:  Thu, 16 Aug 2007 20:23:45 -0600 (MDT)
>       >
>       >---------- Forwarded message ----------
>       >Date: Thu, 16 Aug 2007 19:08:58 -0700
>       >From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
>       >To: Tesla list <tesla@xxxxxxxxxx>
>       >Subject: Re: Ganging Variacs (fwd)
>       >
>       >Hi Terry, Tim,
>       >
>       >I did the same with my variac. I split the core to prevent
>       saturation.
>       >It's been a life saver for me since I only use a single
>       variac with my
>       >pig. But, if I had a large enough variac or two, I wouldn't
>       have done it
>       >(as it does ruin the variac for any other purpose). But if
>       it's solely a
>       >current limiting variac, cutting the core will help prevent
>       saturation
>       >issues, although I have smoked the brushes on this variac
>       from too much
>       >current. Even though saturation is prevented, current still
>       flows and
>       >the components that make up the variac can still be damaged
>       if high enough.
>       >
>       >BTW, remove the brushes at least once a year and inspect
>       them. Can
>       >prevent a bad situation. The smoked brushes occurred at my
>       2005 4th of
>       >July party. Funny, I just turned the current down and the
>       smoke went
>       >away. The coil kept on Rockin! The next weekend I did the
>       optopsy and
>       >found I was running on about 1/3 brush surface. I learned
>       from that
>       >experience to inspect brushes and replace when worn.
>       >
>       >Take care,
>       >Bart
>       >
>       >Tesla list wrote:
>       >
>       > >---------- Forwarded message ----------
>       > >Date: Thu, 16 Aug 2007 12:46:40 -0500
>       > >From: Terry Oxandale <Toxandale@xxxxxxx>
>       > >To: Tesla list <tesla@xxxxxxxxxx>
>       > >Subject: RE: Ganging Variacs (fwd)
>       > >
>       > >There has been a great deal of discussion on this issue as
>       well as the
>       > >parallel aspect. My experience was saturation of the
>       variac core, but
>       > >this is based upon the core size and voltage/turns ratio.
>       I don't have
>       > >the greatest understanding of this issue, but I believe it
>       is focused on
>       > >the fact that only a small portion of the core is used in
>       most of these
>       > >applications (reduce the number of turns reduces which
>       increases
>       > >current, but also increases the voltage/turns ratio to a
>       point of
>       > >saturation.
>       > >
>       > >I successfully split the core of my variacs (two 1256
>       variacs in
>       > >parallel) to prevent this from happening and have been
>       very happy with
>       > >the modulated current profile as compared to the nearly
>       uncontrolled
>       > >profile previous to splitting the core. It was a lot of
>       work though.
>       > >
>       > >Terry
>       > >
>       > >-----Original Message-----
>       > >From: Tesla list [mailto:tesla@xxxxxxxxxx]
>       > >Sent: Thursday, August 16, 2007 7:12 AM
>       > >To: tesla@xxxxxxxxxx
>       > >Subject: Ganging Variacs (fwd)
>       > >
>       > >
>       > >---------- Forwarded message ----------
>       > >Date: Thu, 16 Aug 2007 07:48:34 -0400
>       > >From: timjroche@xxxxxxx
>       > >To: tesla@xxxxxxxxxx
>       > >Subject: Ganging Variacs
>       > >
>       > >I understand about using paralleling chokes when using
>       variacs for
>       > >voltage
>       > >control, what about for ganged series variacs for current
>       control or
>       > >in-other-words, adjustable ballast?
>       >
>       >________________________________________________________________________
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>       > >
>       > >
>       > >
>       > >
>       > >
>       > >
>       > >
>       > >
>       > >
>       >
>       >
>       >
> 
> 
> ________________________________________________________________________________
> 
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