Re: [CAD_CAM_EDM_DRO] Re: Big, Cheap Power for Steppers

In a message dated 12-Feb-02 14:49:05 Central Standard Time, eric@...
writes:

> Inquiring minds like mine would like to know what these transformers look
> like, (a) with the secondary identified, (b) with the secondary removed and
> (c)with a new secondary made from house wiring. Three pictures posted
> would be worth a lot more than a thousand words...

One thing has had me wondering, since I first saw that suggestion that "house
wiring" be used to kludge-on a new secondary to an existing transformer:
"House Wire", either individual conductor stripped out of "Romex" or #12-THN
taken off the spool has PLASTIC insulation, many times THICKER than the
Formvar ("varnish" or "enamel") insulation one finds on "magnet wire" used to
wind a transformer. The "coil window" in standard industry "E-I Cores" has
been sized after years of practical learning-curve, so it will contain JUST
the right copper for correct Volt Amps for that size iron-core. That is, if
you go stuffing wads of "non-transformer insulation" in there with the
copper you use, you won't come CLOSE to being able to wind sufficient
Amp-Turns for reasonable efficiency. Oh, you might get enough voltage, or,
alternately, enough current-capacity, but surely NOT the voltage AND current
("V-A") intended for whatever 750 VA or 1 KVA transformer you are trying to
modify! Just like 6-32 screws aren't used in you Rolex! Well, "kinda",
anyway! Jan Rowland, OLD tinkerer


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