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From: Clifford Heath
Organization: Open Software Associates Limited
X-Mailer: Mozilla 4.61 [en] (X11; I; Linux 2.2.17 i686)
Subject: Re: Any good uses for old microwave over parts?
References: <firstname.lastname@example.org> <email@example.com>
X-Cache: nntpcache 2.3.3 (see http://www.nntpcache.org/)
NNTP-Posting-Date: Tue, 12 Nov 2002 17:28:02 EST
Date: Tue, 12 Nov 2002 17:27:51 +1100
"N. Thornton" wrote:
> I keep wondering if a single TF would be enough to make a really small
> spot welder... How would one do that?
I have a small commercially made spot welder designed for use by
orthodontists to tack-weld stainless steel wires and brackets. It
uses a hefty relay to discharge a largish fast-discharge electrolytic
cap through a transformer which has a secondary akin to copper water
pipe :-). There's a small variac to vary the charge voltage on the cap.
Nice device - a foot pedal yanks the pincer-like electrodes down until
a microswitch built into the pincer mechanism detects sufficient force,
when it fires the relay. So you have both hands free to position the
work, and the welder doesn't fire until the parts are clamped hard
enough. I don't know if a MOT could be pressed into service as the
pulse transformer, but I suspect it could - perhaps the primary would
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