Re: I slotted my 1256B variac core, now...

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: DRIEBEN@xxxxxxxxxxxxxxx 

Hi (Un)Terry,

I can relate to the "pain" of cutting a 1256B variac core as I
attempted this once, but didn't realize that the core needed to be
"clamped" to keep it from sproinging (is that a word?) apart.
Needless to say I ruined a perfectly good variac ;^( I'm not
sure that the gap spacing is too critical just so there is a
a break in the highly permeable silicon steel of the core. At
least that's what I've been told. I'm sure others will add
their comments to this. As for me, I'm through with trying to
cut into variac cores because of my own bad experience ;^O

David Rieben

----- Original Message -----
From: Tesla list <tesla@xxxxxxxxxx>
Date: Wednesday, November 3, 2004 9:47 pm
Subject: I slotted my 1256B variac core, now...

> Original poster: "Terry Oxandale" <toxandale@xxxxxxx>
>
>
> Today I undertook the painful venture of slotting my variac core
> to reduce
> the tendency to saturate when used to vary inductive ballasting. After
> searching the archives I was unable to find any reference to a
> recommendedwidth of the gap that now exists in the core. Is the
> width of this gap
> critically important, or just the fact that one has been created?
> Currentlythe gap is about .060" (the width of the blade used to
> cut it) and as has
> been mentioned many times, it is a coiled band of strap that is
> straining at
> the clamps wanting to bust open. Should I widen this gap some, or
> will this
> be sufficient.
>
> Thanks,
>
> Un-Terry
>
>
>