Re: Current Limiting and Impedence

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Paul B. Brodie" <pbbrodie@xxxxxxxxxxxxx>

Gerry,
When I was in Home Depot the other day looking for polyurethane, I noticed 
a bin full of all thread that also had many sizes of unthreaded steel rod 
as well. While going through some of the rods it came to me that I could 
fill a piece of PVC with a bunch of these rods to use as a core for an 
inductor, similar to a laminated core. I think I would probably need to 
insulate the rods from each other with varnish or polyurethane, right? 
Without having to worry about how much space is available, like with an E/I 
core, the selection of wire gauge should be simpler and you could just keep 
adding layers of wire until you get the inductance required. The thing I 
stupidly didn't do was write down the prices of the steel rod. I'm also 
quite sure that there is a less expensive place to obtain steel rod. In 
fact, it just came to me that back when I had a TIG welder, I bought 1/8" 
uncoated steel rod from the welding supply where I bought Argon. If I 
remember correctly, this steel rod is available in many different types of 
steel from brass to soft low carbon steel to several different types of 
stainless steel.
Later.
Paul
Think Positive


----- Original Message -----
From: "Tesla list" <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx>
To: <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx>
Sent: Monday, May 09, 2005 12:52 PM
Subject: Re: Current Limiting and Impedence

> Original poster: "Gerald  Reynolds" 
<<mailto:gerryreynolds@xxxxxxxxxxxxx>gerryreynolds@xxxxxxxxxxxxx>
>
> Hi Paul,
>
> It seems you can always turn a gapless toroid into a gapped toroid with a
> hacksaw.  I use a toroid as an example only because the math is simplier
> and it is easier to talk about concepts.  The ballast I'm planning on will
> use cyclindrical geometry and welding rods as a core so it will be
> "gapped". I'll probably strip off the flux and varnish the rods (or I'll
> just get steel rod, which ever is cheaper)
>
> Gerry R
>
>>Original poster: "Paul B. Brodie" 
<<mailto:pbbrodie@xxxxxxxxxxxxx>pbbrodie@xxxxxxxxxxxxx>
>>
>>Gerry,
>>I'm really interested in what you guys have had to say on this thread.
>>Please let us know the results of your investigations into gapless
>>toroids. I do have one little question: are there gapped toroids? I've
>>never seen one and it seems that would defeat the purpose of using the
>>toroid shape in the first place. Regards.
>>Paul
>>Think Positive
>
>
>
>