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Well, this was my original primary: The bottom coil is the new one. Here's a comparison between the two.
Here's a closeup of the new coil:
My question is, is the new coil OK? I'm trying to build a SGTC, 7.5kv 30mA NST is my power source, and I will rewind my secondary too to be 26awg (originally 30awg) 16 inch on 3 inch pvc. The old primary was 1/4 inch (20ft) copper tubing, and the new one is about 1/8 inch copper wire (solid core) 20 ft. It is poorly spaced by twine. Is that OK?
also, i would personaly make the coil less warped, one continuous flow going in a spiral on some acrylic or somthing
I have no idea how to resize the image, and I'm on a *very* *very* limited budget. AKA from now on, I have to make do with what I have. Unless I can make one out of wood, I can't make a form for it.
Registered Member #3943
Joined: Sun Jun 12 2011, 05:24PM
Location: The Shire, UK
Posts: 552
As long as you make sure there are no turns shorting out to an adjacent turn then it should be ok. I guess you could try finding some pieces of wood in your garden (don't cut from living trees unless you really have to), letting them dry out and sawing some groves into them for the primary coil support.
Main point is making sure different turns do not touch.
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
You must surely be able to get some PVC from your household, like a empty bottle cut in 4 pieces, let the "round" side stick up, cut slices in it for holding the wire.
Also, use a bottle or some other cylindric object to stretch the wire around, if you find some object with the mean diameter of your primary coil, stretch it all to that diameter and its pretty easy to bend it for the smaller and larger diameter when forming the primary.
I would for sure advice against using that failed primary.
Registered Member #3888
Joined: Sun May 15 2011, 09:50PM
Location: Erie, PA
Posts: 649
Annealing the copper with a blow torch will make it easier to work with (when it cools of course) and I don't think it will make any considerable difference to the conductivity.
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