Some places also have transfer stations where folks drop off appliances.
________________________________
From: Dave Halliday <dh@xxxxxxxxxxxxxx>
To: 'Tesla Coil Mailing List' <tesla@xxxxxxxxxx>
Sent: Saturday, March 8, 2014 12:13 AM
Subject: Re: [TCML] MOT Transformers, VTTC
Advertise in Craigslist for dead microwave ovens.
Your community might also have free classifieds in your local newspaper.
Check with local hotels, restaurants, schools, etc...
I did this about five years ago and still have about 20 MOTS that I use for
projects. Lots of nice other stuff -- microswitches, interlock switches
(higher current), fans, motors, etc... Sheets of stainless steel (the inside
box)
Used mine for power transformers for some CNC machines, a nice small spot
welder and some electronics power supplies.
Also, 12.6 * 33 = 415.8 watts -- most largish ovens are rated for 500-800
watts continuous duty so you should only need one MOT.
#10 is rated for 30 amps. If you are doing intermittent firing, that should
be OK.
http://www.cerrowire.com/ampacity-charts
I would go with stranded wire -- THHN is the stuff to use. Sold wire will
be a bear to form around the core. THHN has a nice hard plastic coating so
it doesn't nick or break -- great stuff. Use stranded!
Also, each transformer has its own characteristics. When you get the core,
wind ten turns of hookup wire, measure the voltage and calculate your
secondary from that measurement. There will be some small pieces of core
laminations that you can remove from the center of the core -- do not do
this as these comprise part of the magnetic circuit of your transformer.
These prevent your core from saturating, blowing fuses and having horrible
efficiency. No need to re-invent the square wheel...
Dave
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx
> [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of David Sharpe
> Sent: Friday, March 07, 2014 18:33
> To: Tesla Coil Mail List
> Subject: [TCML] MOT Transformers, VTTC
>
> Folks, where can I purchase two identical surplus MOT's for a VTTC
> application?
> Voltage is unimportant, I'm cutting off the high voltage windings
> (BLASPHEMY)
> to rewind for filament transformers for a large VTTC. Will
> use #10 solid
> wire for secondary through the space where the HV windings
> once resided.
> Only need about 500VA capacity, so just about any no-name unit would
> be suitable for this application. Final application is 12.6VCT @ 33A.
> Thanks in advance...
>
> --
> Dave Sharpe, TCBOR/HEAS
> Chesterfield, VA USA
>
> Sharpe's Axiom of Murphy's Law
> "Physics trumps opinion!"
> _______________________________________________
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