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Re: RE- variac rewind
---------- Forwarded message ----------
Date: Sun, 12 Oct 1997 18:59:48 PDT
From: Mad Coiler <tesla_coiler-at-hotmail-dot-com>
To: tesla-at-pupman-dot-com
Subject: Re: RE- variac rewind
>---------- Forwarded message ----------
>Date: Fri, 10 Oct 1997 21:50:00 GMT
>From: Robert Michaels <robert.michaels-at-online.sme-dot-org>
>To: tesla-at-pupman-dot-com
>Subject: RE- variac rewind
>
> Variac rewinding is like pissing against the wind. (You said
> you wanted =any= insight [your words, my emphasis] ). In
> your particular case, however, it more like pissing against
> a hurricane.
>
> Firstly -- you either are having very bad luck measuring
> wire these days or someone somewhere forgot how to design
> a Variac. (How sure are you that it's a Variac?? It's
> hard to imagine a firm such as General Radio making that
> kind of mistake).
Hmm, good question. Maybe its a LED. But according to 'The Superior
Electric Company' it is a Luxtrol Light Control. Input is 120V single
phase. Also listed is Max Amps = 50, Max Watts = 6000.
>
> No. 12 wire (I assume that's # 12 - AWG, I'm
> not up on Botswanian [Or Hotmail-ian] wiring standards
> these days) -- No. 12 wire is supposed to carry no
> more than 25 amperes. And that is in =free air=.
> All wound up inside a transformer it surely would
> have to be de-rated. It can take 50-amperes
> and still not be hot enough to toast a decent
> slice of bread, but such is like going out on
> Saturday night without a condom -- risky business.
Thats another good point. I wont use Hotmaillian this time however. i
was thinking the exact same thing about the wire gauge. But the motor
shop I took it too put a micrometer on it and it is indeed #12 (American
Wire Gauge). I could tell that by looking at it though. But here is
something else to consider; half of the variac (the high side) is double
wound in parallel. Translating from Hotmaillian; there is two coils that
our wound in parallel, one turn of coil A then one turn of coil B and
alternating all the way to the end. If my accent still shows I will
attempt to draw it out.
N Wiper H
| | |
| V |
OOOOOOOOOOOOOOOOOOOOOOOOOO|
|OOOOOOOOOOOOOO|
OOO = coil
>
>
<SNIP>
>
> Such sparks will rapidly cause pitting of the windings
> (not to say the wiper itself) which will increase the
> sparking, which will increase the pitting, which will
> increase the sparking, which will increase the pitting,
> which will increase the sparking, which will increase
> the pitting, which will increase the sparking, which
> will make you sorry you ever thought of rewinding (not
> to say writing -- your post).
That I did realize (because that is what happened to the variac). The
wiper was not making good contact and several windings were severely
burnt and pitted.
>
> - - - - - - -
>
> Make it easy on yourself: Get a job slinging hamburgers
> for a few days. Then you can buy a real Variac (clone
> thereof more likely), and use your # 13 wire for something
> you can't buy so readily if at all (Hint: It starts with
> T [and ends with c-o-i-l] ).
>
I do have a job, and it isnt slinging burgers. Unfortunately the pay
isnt much better and what I do get paid has been goin to school and to
Tektronix.
> In this burg (pardon the expression) you can
> easily make $25 per shift slinging (that's
> after taxes). In four shifts you can buy
> any of a number of used Variac (clones), and
> within a month you can rule the world (Variac
> wise). It's the American way. (Don't know
> about Botswania - or wherever that "Hotmail"
> Domain is).
>
> When it comes to pissin',
> I prefer porcelain, in
> -- Detroit, USA
>
> Robert Michaels,
> Sane Coiler
>
Your post was very entertaining Mr. Sane Coiler! BTW, many have said I
am like a mad scientist. I thought that was pretty cool but it just
didn't sound that good, so I adapted it to Mad Coiler. Whats wrong with
using my CB handle anyways?
>
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