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Re: [TCML] joining wires halfway through secondary winding



Hey---

A clean way to do this is to back off a turn or two, drill a small hole in the form right under where the joint will be, then rewind the 1 or 2 turns, twist and solder the ends and stick them through the hole. This makes an all but invisible joint and the soldered ends are inside the coil in a region free of radial electric field. If you can keep this pigtail short, so much the better.

---Carl

Hey,I'm working on a 15kv 120ma nst tesla coil build using a 5.7inch pvc.The length of 26 gauge magnet wire needed for 25 inches of winding worked out to be just over 2,000 ft of wire.So to be safe, I bought 3,000ft.
However, halfway through winding the wire ran out! I'm not sure if they sent me the wrong length of wire, or what happened, but I didn't have time to have more wire shipped and redo the winding. So I decided to join the wire with another spool of around 1,500ft 26 guage wire. I burned a few millimetres of enamel off each tip and connected them with solder. The joint was barely larger than the wire. Then I coated the solder joint with a bit of superglue, and dipped the wire in varnish and let dry several times. Then I wound the rest of the coil. I will be coating it many many times with varnish.
I've heard that it is a really bad idea to join wire halfway through a secondary winding, but hopefully the job I did will hold up.
Here are several pictures of the joining of the wires:
-solder job: http://i40.tinypic.com/34zh89c.jpg-a few coats of varnish: http://i44.tinypic.com/243rkh4.jpg-The joint in the winding: http://i41.tinypic.com/zyg9yp.jpg-The full coil: http://i42.tinypic.com/w20q4l.jpg
a few questions:Has anyone ever tried this before? and were there any problems?Should i have the joint closer to the top or the bottom of the coil?Any suggestions?

thanks guys!


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